Friedrich AS - W126BMS0 Service Manual

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Room Air Conditioner SVC MANUAL(General)

CAUTION

Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel.

960-914-06

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Air Conditioner Service Manual

CONTENTS

Part 1 General Information

1. Safety Precautions........................................................................................................4

2. Nomenclature ...............................................................................................................7

Part 2 Functions & Controls

1. List of Functions & Controls........................................................................................9

2. Basic Mode Controls .................................................................................................10

3. Special Mode Controls ...............................................................................................12

4. Utility Functions .........................................................................................................13

Part 3 Test Run

1. Check before Test Run ...............................................................................................17

2. Test Run Flow chart ....................................................................................................18

3. Test Run Detail ............................................................................................................19

Part 4 Trouble Shooting Guide

1. 2-Way, 3-Way Valve ....................................................................................................21

2. Pumping Down ...........................................................................................................22

3. Evacuation (All amount of refrigerant leaked) ........................................................23

4. Gas Charging (After Evacuation) ..............................................................................24

5. Cycle Troubleshooting Guide....................................................................................25

6. Electric Parts Troubleshooting Guide.......................................................................28

7. Self-diagnosis Function .............................................................................................32

■ Indoor Unit Error .................................................................................................... 32

■ Outdoor Unit Error ..................................................................................................34

■ Trouble Shooting Guide (Indoor Unit)....................................................................36

■ Trouble Shooting Guide [Outdoor Unit (2 LED Type)]..........................................41

■ Trouble Shooting Guide [Outdoor Unit (1 LED Type)]..........................................56

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1. Safety Precautions ............................................................................................................4

2. Nomenclature......................................................................................................................7

Part 1 General Information

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Part 1 General Information

1. Safety Precautions

1.1 Cautions in Repair

To prevent injury to the user or other people and property damage, the following instructions must be followed.

■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications.

This symbol indicates the possibility of death or serious injury.

This symbol indicates the possibility of injury or damage to properties only.

■ Meanings of symbols used in this manual are as shown below.

Be sure not to do.

Be sure to follow the instruction.

Dangerous Voltage

Be sure to disconnect the power cable plug from the plug socket before disassembling the equipment for a repair.Internal components and circuit boards are at main potential when the equipment is connected to the power cables. This high voltage is extremely dangerous and may cause death or severe injury if come in contact with it.

Do not touch the discharging refrigerant gas during the repair work. The discharging refrigerant gas.The refrigerant gas can cause frostbite.

Release the refrigerant gas completely at a well-ventilated place first. Otherwise, when the pipe is disconnected, refrigerant gas or refrigerating machine oil discharges and it Can cause injury.

When the refrigerant gas leaks during work, perform ventilation. If the refrigerant gas comes in contact with a fire, poisonous gas generates. A case of leakage of the refrigerant and the closed room full with gas is dangerous because a shortage of oxygen occurs. Be sure to perform ventilation.

When removing the front panel or cabinet, execute short-circuit and discharge between high voltage capacitor terminals. If discharge is not executed, an electric shock is caused by high voltage resulting in a death or injury.

Do not turn the air-conditioner ON or OFF by plugging or unplugging the power plug. There is risk of fire or electrical shock.

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Part 1 General Information

Do not turn on the breaker when the front panel and cabinet are removed.

Be sure to ground the air conditioner with an earthing conductor connected to the earthing terminal.

Conduct repair works after checking that the refrigerating cycle section has cooled down sufficiently. Otherwise, working on the unit, the hot refrigerating cycle section can cause burns.

Do not tilt the unit while removing panels. Otherwise, the water inside the unit can spill and wet floor.

Do not use the welder in a well-ventilated place. Using the welder in an enclosed room can cause oxygen deficiency.

Be sure to turn off power switch before connecting or disconnecting connector, or parts damage may be occur.

Do not use a defective or underrated circuit breaker. Use the correctly rated breaker and fuse. Otherwise there is a risk of fire or electric shock.

Install the panel and the cover of control box securely. Otherwise there is risk of fire or electric shock due to dust, water etc.

Indoor/outdoor wiring connections must be secured tightly and the cable should be routed properly so that there is no force pulling the cable from the connection terminals. Improper or loose connections can cause heat generation or fire.

Do not touch, operate, or repair the product with wet hands. Holding the plug by hand when taking out. Otherwise there is risk of electric shock or fire.

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Part 1 General Information

Check to see if the parts are mounted correctly and wires are connected. Improper installation and connections can cause an electric shock or an injury.

Check whether the installation platform or frame has corroded. Corroded installation platform or frame can cause the unit to fall, resulting in injury.

Be sure to check whether the earth wire is correctly connected.

After the work has finished, be sure to do an insulation test to check whether the resistance is 2[Mohm] or more between the charge section and the non-charge metal section (Earth position). If the resistance value is low, a disaster such as a leak or electric shock is caused at user’s side.

Check the drainage of the indoor unit after the repair. If drainage is faulty the water may enter the room and wet floor.

1.2 Inspections after Repair

Check to see if the power cable plug is not dirty or loose. If the plug is dusty or loose it can cause an electrical shock or fire.

Do not use a joined power cable or extension cable, or share the same power outlet with other electrical appliances. otherwise, it can cause an electrical shock, excessive heat generation or fire.

Do not insert hands or other objects through the air inlet or outlet while the product is operating. There are sharp and moving parts that could cause personal injury.

Do not block the inlet or outlet of air flow. It may cause product failure

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Part 1 General Information

2. Nomenclature

2.1 Global Model Name

Code Type Code of Model Meaning

1 Production Center, A~Z L: Chang-won R22

Refrigerant A: Chang-won R410A

U: Tianjin R410A

2 Product Type A~Z S: Split Type Air Conditioner

3 Cooling/Heating/Inverter A~Z C: Cooling Only

H: Heat Pump X: C/O + E/Heater Z: H/P + E/Heater V: AC Inverter C/O N: AC Inverter H/P Q: DC Inverter C/O W: DC Inverter H/P

4, 5 Capacity 0~9 Cooling/Heating Capacity

Ex. "09" → 9,000 Btu/h

6 Electric Range 1~9 1: 115V/60Hz

A~Z 2: 220V/60Hz

3: 208-230V/60Hz 5: 200-220V/50Hz 6: 220-240V/50Hz 7: 110V, 50/60Hz

7 Chassis A~Z Name of Chassis

8 Look A~Z Look,

Color (Artcool Model)

9 Function A~Z

10 Serial No. 1~9 Model Development Serial No.

12 - 345678910

Basic A Basic+4Way B Basic+Deodorizing Filter (Carbon filter) C Plasma+(A/changeove)+A/clean+2Way+Ion E Plasma+(A/changeove)+A/clean+4way+Ion+Lamp F Plasma+(A/changeove)+A/clean+Low A G Plasma+(A/changeove)+A/clean+4way+Low A H Plasma+(A/changeove)+A/clean L Plasma+(A/changeove)+A/clean+4way M Plasma+(A/changeove)+A/clean+PTC N Plasma+(A/changeove)+Autoclean+4way+PTC P Plasma+(A/changeove)+A/clean+4way+Low A+PTC Q Smart(Robot) Cleaning R Eco eye+Plasma+Allergy Filter+4way S Plasma+Allergy Filter+4way U Allergy Filter+4way V Allergy Filter+2way W Basic+Low Ambient Y Basic+(A/clean)+4way+Low A Z

AS-W126BMS0

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Part 2 Functions & Controls

1. List of Controls & Functions ..........................................................................................9

2. Basic Mode Controls......................................................................................................10

3. Special Mode Controls...................................................................................................12

4. Utility Functions .............................................................................................................13

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Part 2 Functions & Controls

1. List of Functions & Controls

Cooling Mode Heating Mode Healthy Dehumidification Auto Changeover

Jet Cool Jet Heat Energy saving

Forced operation Auto Clean

Air volume control Natural Air control Auto Swing Sleep mode Auto control

Auto Restart Function

Category Function Description Remark

Cooling operation Heating operation Dry operation Cooling mode is automatically changed to heating mode and

vice versa Powerful cooling mode Powerful heating mode Air volume & set temp. are automatically selected for saving

energy in cooling mode Operation without remote controller After cooling operation, this function makes the evaporator

dry Indoor Fan speed Control Air volume control Program Vertical Airflow Direction control Air volume & set temp. are automatically changed for com-

fortable sleep When power returns after a power failure, Unit restarts in the

previous operating mode

Basic mode

controls

Special Mode

controls

Utility Functions

NOTE: The Exploded View SVC Manual has the particular Function table for each model.

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Part 2 Functions & Controls

2. Basic Mode Controls

2.1 Cooling Mode

Setting Temp.

-0.5C(-1F)

+0.5C(1F)

Comp. OFF

Thermo ON

Thermo OFF

INV. Comp. Frequency

LowHigh

• Operating frequency of compressor depends on the load condition, like the difference between the room temp. and

the set temp., frequency restrictions.

• If the compressor operates at some frequency, the operating frequency of compressor cannot be changed within 90

seconds. ( not emergency conditions)

• Compressor turned off when

- Intake air temperature reaches below 0.5°C(1°F) of the setting temperature for three minute continuously.

- Intake air temperature reaches below 1.5°C(3°F) of the setting temperature

• Compressors 3 minute time delay.

- After compressor off, the compressor can restart minimum 3 minute later.

2.2 Heating Mode

2˚C(3.6˚F)

4˚C(˚F)

Comp. OFF

INV. Comp. Frequency

LowHigh LowHigh Comp. OFF

Setting

Temp.

Thermo ON

Thermo OFF

• Operating frequency of compressor depend on the load condition, The difference between the room temp. and set

temp., frequency restrictions.

• If compressor operates at some frequency, the operating frequency of compressor cannot be changed within 90 sec-

onds.

• Condition of compressor turned off

- When intake air temperature reaches 4°C(°F) above the setting temperature.

• Condition of compressor turned on

- When intake air temperature reaches below 2°C(3.6°F) of above the setting temperature.

* Condition of indoor fan turned off

• While in defrost control, the indoor and outdoor fans are turned off.

• Compressor 3 minute delay

- After compressor off, the compressor can restart minimum 3 minute later.

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Part 2 Functions & Controls

2.3 Healthy Dehumidification operation

• When the dehumidification operation is set by the remote controller, the intake air temperature is detected and the set-

ting temp. is automatically set according to the intake air temperature.

•

When intake air temp. is 1°C(2°F) above the setting temp., condition of compressor is same as in cooling mode operation.

• When intake air temperature reaches 1°C(2°F) below the setting temp., compressor operates in step1~step3 and the

indoor fan speed again operates at low speed or comes to a stop.

2.4 Auto changeover operation

• The air conditioner changes the operation mode automatically to keep indoor temperature steady.

• When room temperature vary over ±2°C(±4°F) with respect to setting temperature, air conditioner keeps the room tem-

perature in ±2°C(±4°F) with respect to setting temperature by changing the mode from cooling to heating and vice versa.

Intake air Temp. Setting Temp.

26°C(78.8

°F)

≤ intake air temp. 25°C(77

°F)

24°C(75.2

°F)

≤ intake air temp.< 26°C(78.8

°F)

intake air temp. -1°C(-2

°F)

22°C(71.6

°F)

≤ intake air temp. < 24°C(75.2

°F)

intake air temp. -0.5°C(-1

°F)

18°C(64.4°F) ≤ intake air temp. < 22°C(71.6

°F)

intake air temp.

intake air temp. < 18°C(64.4

°F)

18°C(64.4

°F)

+0.5C(+1F)

-0.5C(-1F)

-2C(-4F)

+4C(+8F) +2C(+4F)

Cooling thermo off

Heating thermo off

Switching point

Setting

Temp.

Cooling operation

Heating operation

Cooling operation

Mode

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Part 2 Functions & Controls

3. Special Mode Controls

3.1 Jet Cool operation

• In the heating mode or Auto Changeover operation, the Jet cool function does not work.

When it is input while in other mode of operation (cooling, dehumidification, Air purification, Air circulation), the Jet cool operation takes place.

• In the Jet cool mode, the indoor fan is operated at super-high speed for 30 min. at cooling mode operation.

• In the Jet cool mode, the room temperature is maintained at a setting temperature of 18°C(64.4°F).

• When the sleep timer mode is input during the Jet cool operation, the Jet cool mode has the priority.

• When the Jet cool button is pressed, the horizontal vane of the unit is reset to those of the initial cooling mode and

then operate so that the air outflow could reach further.

3.2 Jet Heat operation

• While in cooling mode or Auto Changeover operation, the Jet Heat function does not work.

When it is input while in the Heating mode operation (dehumidification), the Jet Heat mode operation takes place

• In the Jet Heat mode, the indoor fan operated at super-high speed for 60 min. at Heating mode operation.

• In the Jet Heat mode, the room temperature is maintained at a temperature of 30°C(86°F).

• When the sleep timer mode is input during the Jet Heat mode operation, the Jet Heat mode has the priority.

• When the Jet Heat button is pressed, the horizontal vane of the unit is the unit reset to those of the initial Jet heating

mode and then operates so that the air outflow could reach under flow.

3.3 Energy saving operation in cooling mode

• During cooling and dehumidification mode of operation, the Energy saving button can be input.

• In this operation, before we feel cold the set temperature and air volume is set automatically to save energy.

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Part 2 Functions & Controls

4. Utility Functions

4.1 Forced operation

• To operate the appliance manually in case when the remote control is lost, the forced operation selection switch is on

the main unit of the appliance, and operate the appliance in the standard conditions.

• The operating condition is set according to the outdoor temp. and intake air temperature as follows.

• Operating procedures when the remote control can't be used is as follows :

- The operation will be started if the ON/OFF button is pressed.

- If you want to stop operation, re-press the button.

- The ON/OFF switch is on the display PCB or side of indoor unit

4.2 Auto cleaning operation

• Function used to perform Self Cleaning to prevent the Unit from Fungus and bad odor.

• Used after the Cooling Operation before turning the unit off, clean the Evaporator and keep it dry for the next opera-

tion.

• The function is easy to operate as it is accessed through the Remote controller.

Indoor temp.

over 24°C(75.2°F)

21~24°C(69.8~75.2°F)

below 21°C(69.8°F)

Setting temp.

22°C(71.6°F)

23°C(73.4°F)

24°C(75.2°F)

Setting speed of

indoor fan

High speed

Operating Mode

Cooling

Healthy Dehumidification

Heating

Comp.

OFF

Setting Step Super Low

Indoor Fan

Cooling CYCLE

OFF

30 Min

Fan

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Part 2 Functions & Controls

4.3 Air volume control

• UIndoor fan motor control have 6 steps or 8 steps.

• UAir volume is controlled "SH", "H", "MH", "M", "ML", "L" by the

remote controller.

• "SL" step is selected in "Sleep Mode" operation.

4.4 Natural Air Control(Natural Wind)

• When the Auto Step is selected and then operated, the high, medi-

um, or low speed of the airflow mode is operated for 2~15 sec. randomly by the Chaos Simulation.

4.5 Auto Swing

• By the Auto swing key input, the horizontal vane automatically operates with the Auto swing or it is fixed to the desired

direction.

4.6 Sleep mode Auto control

• When the set sleep time is reached set time of [1,2,3,4,5,6,7hour] input by the remote control during the operation, the

operation of the appliance stops.

• When the appliance is on pause, the sleep timer mode cannot be input.

4.6.1 Sleep timer operation for cooling cycle

• While in cooling mode , 30 min. after the start of the sleep timer, the setting temperature increases by 1°C(2°F).

After another 30minutes lapse, it increases again by 1°C(2°F).

SL Super Low

L Low

ML Medium-Low

M Medium

MH Medium-High

H High

SH Super High

Auto Natural Wind

Step Description

NOTE: Some Models are different by swing width and swing pattern.

Setting temp. (˚C)

1.0˚C(2˚F) up

Cooling ON temp. (Setting temp. +0.5˚C(+1˚F))

Cooling OFF temp. (Setting temp. -0.5˚C(-1˚F))

0.5 1 Sleep time (hour

)

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Part 2 Functions & Controls

4.6.2 Sleep timer operation for heating cycle

• While in heating mode, 60 min. after the start of the sleep timer, the setting temperature decreases by 1°C(2°F).

After another 60minutes lapse, it decreases again by 1°C(2°F).

4.7 Auto restart

• When the power comes back after a sudden power failure during operation, the mode before the power failure is kept

on the memory of the appliance and it automatically operates in the saved mode on the memory.

• Operation mode that is kept on the memory

- State of operation ON/OFF

- Operation mode/setting temp./selected airflow speed

- Sleep timer mode/remaining time of sleep timer

- Auto Swing

Setting temp. (°C)

Heating ON temp. (Setting temp)

Heating OFF temp. (Setting temp. +4.0°C(+8°F))

1 2 Sleep time (hr

)

1.0°C(2°F) down

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Part 3 Test Run

1. Check before Test Run...................................................................................................17

2. Test Run Flow chart .......................................................................................................18

3. Test Run Detail................................................................................................................19

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Part 3 Test Run

Check to see whether there is any refrigerant leakage, and check whether the power or transmission cable is connected properly.

NOTE: Check that there should be no disconnection when all pins and wires are pulled by hands.

Check whether the liquid pipe and gas pipe valves are fully opened.

NOTE: Be sure to tighten caps.

Confirm that 500 V megger shows 2.0 MΩ or more between power supply terminal block and ground. Do not operate in the case of 2.0 MΩ or less.

NOTE: Never carry out mega ohm check over terminal control board.

Otherwise the control board may break.

Immediately after mounting the unit or after leaving it turned off for an extended length of time, the resistance of the insulation between the power supply terminal board and the ground maydecrease to approx. 2.0 MΩ as a result of refrigerant accumulation in the internal compressor.

If the insulation resistance is less than 2.0 MΩ, turn on the main power supply.

1. Check before Test Run

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Part 3 Test Run

Is cold air discharged for

more than 3 minutes ?

START

Test operation for indoor unit

Operation mode change

to Heating mode

Operate the unit in cooling mode.

Does Test operation start?

Refer to part4, 6 Electric part

Yes

Refer to part4, 5 Cycle part

Is hot air discharged ?

After Hot Start

NOTE: When outdoor temperature is low,the unit is operated to Heating mode

Yes

Is there any temperature

difference between intake and

discharged air?

Yes

Is the operating current

normal ?

Yes

Normal

Refer to Troubleshooting

Guide

* Check the load (In/Out Temp.) * Check pipe length and amount of

refrigerant

* Check for abnormal sound in

outdoor unit (comp.,Fan, others )

2. Test Run Flow chart

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Part 3 Test Run

1. Check that all tubing and wiring have been properly connected.

2. Check that the gas and liquid side service valves are fully open.

3. Check that all pins and wires have been connected thoroughly by pulling with hands.

Settlement of outdoor unit

• Anchor the outdoor unit with a bolt and nut(ø10mm) tightly

and horizontally on a concrete or rigid mount.

• When installing on the wall, roof or rooftop, anchor the

mounting base securely with a nail or wire assuming the influence of wind and earthquake.

• In the case when the vibration of the unit is conveyed to the

hose, secure the unit with an anti-vibration bushing.

NOTE: If the actual pressure is higher than shown, the

system is most likely over-charged, and charge should be removed. If the actual pressure are lower than shown, the system is most likely undercharged, and charge should be added.

The air conditioner is now ready for use.

5. Check operating current.

6. Change operation mode and check.

Evaluation of the performance

Operate unit for 15~20 minutes, then check the system refrigerant charge:

1. Measure the pressure of the gas side service valve.

2. Measure the temperature of the intake and discharge air.

3. Ensure the difference between the intake temperature and the discharge is more than 8°C(46°F) (Cooling) or (Heating).

4. For reference; the gas side pressure of optimum condition is as below.(Cooling)

Bolt

Tubing connection

Discharge temperature

Discharge air

Intake temperature

R22 35°C (95°F) 4~5kg/cm2G(56.8~71.0 P.S.I.G.)

R410A 35°C (95°F) 8.5~9.5kg/cm

G(120~135 P.S.I.G.)

Outside ambient

TEMP.

Refrigerant

The pressure of the gas side

service valve.

This is performed when the unit is to be relocated or the refrigerant circuit is serviced.

Pump Down means collecting all refrigerant in the outdoor unit without loss in refrigerant gas.

CAUTION:

Be sure to perform Pump Down procedure with the unit in cooling mode.

Pump Down Procedure

1. Connect a low-pressure gauge manifold hose to the charge port on the gas side service valve.

2. Open the gas side service valve halfway and purge the air from the manifold hose using the refrigerant gas.

3. Close the liquid side service valve(all the way in).

4. Turn on the unit's operating switch and start the cooling operation.

5. When the low-pressure gauge reading becomes 1 to

0.5kg/cm

G(14.2 to 7.1 P.S.I.G.), fully close the gas side valve stem and then quickly turn off the unit. At that time, Pump Down has been completed and all refrigerant gas will have been collected in the outdoor unit.

PUMP DOWN

3. Test Run Detail

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Part 4 Trouble Shooting

1. 2-Way, 3-Way Valve ........................................................................................................21

2. Pumping Down ..............................................................................................................22

3. Evacuation (All amount of refrigerant leaked) ............................................................23

4. Gas Charging (After Evacuation) .................................................................................24

5. Cycle Troubleshooting Guide .......................................................................................25

6. Electronic Parts Troubleshooting Guide......................................................................26

7. Self-diagnosis Function.................................................................................................30

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Part 4 Trouble Shooting

2-way Valve (Liquid Side) 3-way Valve (Gas Side)

Shaft position Shaft position Service port

Closed Closed Closed

(with valve cap) (with valve cap) (with cap)

Open Closed Open

(counter-clockwise) (clockwise) (push-pin or with

vacuum pump)

Open Open Closed

(with valve cap) (with valve cap) (with cap)

Closed Open Open

(clockwise) (counter-clockwise) (connected manifold

gauge)

Open Open Open

(with charging

cylinder)

Open Open Open

(with charging

cylinder)

Open Open

Works

Shipping

Air purging (Installation)

Operation

Pumping down (Transferring)

Evacuation (Servicing)

Gas charging (Servicing)

Pressure check (Servicing)

Gas releasing (Servicing)

Valve cap

Open position Closed position

Service port

Service port cap

To outdoor unit

Flare nut

To piping connection

To outdoor unit

Hexagonal wrench (4mm)

Open position Closed position

To piping connection

Flare nut

Open

(with charging cylinder)

Open

(with charging cylinder)

1. 2-Way, 3-Way Valve

- 22 -

Part 4 Trouble Shooting

• Procedure

(1) Confirm that both the 2-way and 3-way valves

are set to the open position.

– Remove the valve stem caps and confirm that

the valve stems are in the raised position.

– Be sure to use a hexagonal wrench to operate

the valve stems.

(2) Operate the unit for 10 to 15 minutes.

(3) Stop operation and wait for 3 minutes, then

connect the charge set to the service port of the 3-way valve.

– Connect the charge hose with the push pin to

the service port.

(4) Air purging of the charge hose.

– Open the low-pressure valve on the charge set

slightly to air purge from the charge hose.

(5) Set the 2-way valve to the closed position.

(6) Operate the air conditioner at the cooling

cycle and stop it when the gauge indicates 1kg/cm

(7) Immediately set the 3-way valve to the closed

position.

– Do this quickly so that the gauge ends up indi-

cating 3 to 5kg/cm

(8) Disconnect the charge set, and mount the 2-

way and 3-way valve’s stem nuts and the service port nut.

– Use torque wrench to tighten the service port

nut to a torque of 1.8 kg.m.

– Be sure to check for gas leakage.

Closed

Purge the air

Outdoor unit

Indoor unit

Liquid side

Gas side

Open

2-Way valve

3-Way valve

2. Pumping Down

- 23 -

Part 4 Trouble Shooting

• Procedure

(1) Connect the vacuum pump to the center hose

of charge set center hose

(2) Evacuation for approximately one hour.

– Confirm that the gauge needle has moved

toward 0.8 Torr.

(3) Close the valve (Lo side) on the charge set,

turn off the vacuum pump, and confirm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).

(4) Disconnect the charge hose from the vacuum

pump.

– Vacuum pump oil.

If the vacuum pump oil becomes dirty or depleted, replenish as needed.

Open

Vacuum pump

3-Way valve

Outdoor unit

Liquid side

Indoor unit

Gas side

3-Way valve

OPEN

Vacuum Gage

OPEN

3. Evacuation (All amount of refrigerant leaked)

- 24 -

Part 4 Trouble Shooting

Charging cylinder

Outdoor unit

Indoor unit

Liquid side

Gas side

Open

3-Way valve

OPEN

Open

Check valve

(1)

Vacuum Gage

• Procedure

(1) Connect the charge hose to the charging

cylinder.

– Connect the charge hose which you dis-con-

nected from the vacuum pump to the valve at the bottom of the cylinder.

– If you are using a gas cylinder, also use a

scale and reverse the cylinder so that the system can be charged with liquid.

(2) Purge the air from the charge hose.

– Open the valve at the bottom of the cylinder

and press the check valve on the charge set to purge the air. (Be careful of the liquid refrigerant). The procedure is the same if using a gas cylinder.

(3) Open the valve (Lo side on the charge set and

charge the system with liquid refrigerant.

– If the system can not be charged with the spec-

ified amount of refrigerant, it can be charged with a little at a time (approximately 150g each time) while operating the air conditioner in the cooling cycle; however, one time is not sufficient, wait approximately 1 minute and then repeat the procedure (pumping down-pin).

(4) Immediately disconnect the charge hose from

the 3-way valve’s service port.

– Stopping partway will allow the gas to be dis-

charged.

– If the system has been charged with liquid

refrigerant while operating the air conditioner turn off the air conditioner before disconnecting the hose.

(5) Mount the valve stem nuts and the service

port nut.

– Use torque wrench to tighten the service port

nut to a torque of 1.8 kg.m.

– Be sure to check for gas leakage.

This is different from previous procedures. Because you are charging with liquid refrigerant from the gas side, absolutely do not attempt to charge with larger amounts of liquid refrigerant while operating the air conditioner.

4. Gas Charging (After Evacuation)

- 25 -

Part 4 Trouble Shooting

5. Cycle Troubleshooting Guide

Problem Possible causes Corrective action Error Code

Abnormal operating conditions.

• There is a burning smell and a strange sound coming from the unit.

• Turn off the air conditioner, unplug the power cord and contact the service center.

• Water leaks from the indoor unit even when the humidity level is low.

• The power cord is damaged or generating excessive heat.

•

A switch, a circuit breaker (safety, ground) or a fuse is not operated properly.

The air conditioner does not work.

• The air conditioner is unplugged.

• Check whether the power cord is plugged into the outlet.

• A fuse is blown or the power supply is blocked.

• Replace the fuse or check if the circuit breaker has tripped.

• A power failure has occurred.

• Turn off the air conditioner when a power failure occurs.

• When the power is restored, wait 3 minutes, and then turn on the air conditioner.

• The voltage is too high or too low.

• Check if the circuit breaker has tripped. 23, 40

• The air conditioner turned off automatically at a preset time.

• Press the power button again. 10

• Battery setting is wrong in the remote controller.

• Is the battery inserted in Remote controller? Is the battery inserted with the correct terminal (+)(-)?

• Even if you check the upper lists, the air-conditioner does not operate. Please replace new batteries.

The air conditioner does not work.

• The type of the indoor units is not compatible with that of the outdoor unit.

• Replace the outdoor unit to suitable one. 05, 53

• The outdoor air temperature is unsuitable for operating the air conditioner.

• Heating operation can be used when the outdoor air temperature is under 18°C, and cooling operation can be used when the outdoor air temperature is over -10°C.

Part 4 Trouble Shooting

- 26 -

Problem Possible causes Corrective action Error Code

The air conditioner does not generate cool air.

• Air is not circulatingproperly.

• Make sure that there are no curtains, blinds or furniture blocking the front of the air conditioner.

• The air filter is dirty.

• Clean the air filter once every 2 weeks.

• See “Cleaning Air Filter” for more information.

• The room temperature is too high.

• In summer, it may take some time to cool indoor air.

• In this case, select the jet cool operation to cool indoor air quickly.

01, 05, 09

• Cold air is escaping from the room.

• Make sure that no cold air is escaping through ventilation points in the room.

•

The desired temperature is higher than the set temperature.

• Set the desired temperature to a level lower than the current temperature.

• There is a heating source nearby.

• Avoid using a heat generator such as an electric oven or a gas burner while the air conditioner is in operation.

• Air circulation operation is selected.

• In the air circulation operation, air blows from the air conditioner without cooling or heating the indoor air.

• Switch the operation mode to the cooling operation.

• Outside temperature is too high.

• The cooling effect may not be sufficient.

01, 26, 32,

61, 62

The air conditioner does not generate warm air.

• When the heating mode is started.

• Vane is almost closed and air flow does not come out.

• Even though outdoor unit is already begun to operate.

• This symptom is normal.

• Please wait until the unit is preparing warm air.

• This function prepare to blow warm air.

• Defrosting mode is being done in the outdoor unit.

• In heating mode, ice/frost is built up on the coils when the outside temperature fall down.

• This function remove a layer of frost on the coil.

• Please wait until this operation is completed. It takes about 15 mins.

• Outside temperature is too low.

• The heating effect may not be sufficient.

01, 26, 32,

61, 62

The air-conditioner stops during operation.

• The air conditioner is suddenly turn off.

• The timer function could be operated. If the timer function would operate, the air-conditioner can be turn off.

• Check the timer setting is correct.

41, 44, 45,

• A power failure has occurred during operation.

• There is the Auto Restart Function. It is a default setting.

• This function can turn on the unit automatically when the power is restored.

• If you live in frequent power failure area, this function would be useful.

41, 44, 45,

Part 4 Trouble Shooting

- 27 -

Temperature difference between intake and discharge air depends on room air humidity. When the room air humidity is relatively higher, temperature difference is smaller. When the room air humidity is relatively lower temperature difference is larger.

NOTICE

Problem Possible causes Corrective action Error Code

The air conditioner stops during operation.

• The connection of the indoor and outdoor units has a problem.

• Conduct the wiring and piping error check.

05, 09, 53

• The thermistor recognition has a defect.

• Check that the thermistor have been separated from the pipe holder.

09, 32, 41,

• The electronic expansion valve operates incompletely.

• Check the temperature of the connection pipe.

44, 61, 65

Indoor unit is still operating even when the power is being turned off.

• Auto-Clean mode is being operated.

• This function is to remove the rest of moisture indoor unit.

• Please, wait until the end of functions.

• It will be inhibit a fungal growth. If you do not want this feature, you can turn off to press.

Mist is discharged from the air outlet of the indoor unit.

• The cooled air from the air conditioner makes mist.

• When the room temperature is down, this phenomenon will disappear.

01, 02, 06,

Water leaks from the outdoor unit.

• In the heating operations, condensed water drop from the heat exchanger.

• This symptom need to install drain hose under the base pan.

• Contact the installer.

Operating noise or vibration.

• Clicking sound Clicking sound can be heard either

when the unit starts or stops due to movement of reversing valve.

• Creaking sound The plastic parts of the indoor unit

make sound of shrinks and expands due to a sudden temperature change.

• The water flowing sound, Blowing

sound

The flow of refrigerant through the air conditioner is switching, noise can be heard.

• These are normal symptoms.

• After a moment, it will be silent.

41, 45, 62

Operating noise or vibration.

• The installation condition is in trou-

ble.

• Adjust the position of the air conditioner so that it can have enough space.

10, 26, 67

The indoor unit gives out odor.

• The air smells bad because a musty or cigarettes odor may be absorbed into the indoor unit and discharged with airflow.

• If the smell does not disappear, you need to wash filter or heat exchanger.

• Contact the installer.

- 28 -

Part 4 Trouble Shooting

The Product doesn’t operate at all. (9~30kBtu/h Model)

Turn off the main power and wait until LED on outdoor PCB is off.

Turn on the main power again.

Does "Beeping" sound is made from the indoor unit?

Does "Lighting" LED is mounted on the outdoor PCB?

• Primarily, the operating condition of Micom is O.K.

• Check CN-DISP1

Check the voltage of power(AC 208~230V, 60Hz).

• The voltage of main power.

• The voltage applied to the unit.

• The connecting method of Indoor/Outdoor connecting cable (each color)

• The P.W.B. Ass'y (Fuse,Noise Filter, Power Module(SMPS), IC01D,IC04D)

• Connection between housing and harness.

• All the harnesses should be checked by pulling with hands directly.

• No harness should be divided from the housing.

Trouble 1

YES

The operation check of the P.C.B. Ass'y

Procedure

Specification

1) The input voltage of Power Module(SMPS)

2) The output voltage of Power Module (SMPS)

3) IC01D(LD1085), IC04D(7805)

: DC 220V~390V

: 15V ±10%

: DC 5V

Remedy

Replace the P.C.B.

6. Electronic Parts Troubleshooting Guide

- 29 -

Part 4 Trouble Shooting

Turn on main power.

While the compressor has been stopped, the compressor does not operate

owing to the delaying function for 2 minutes after stopped.

When the compressor stopped Indoor Fan is driven by a low speed.

At this point the wind speed is not controlled by the remote controller.

(When operated in the Sleeping Mode, the wind speed is set to the low speed as force).)

Caused by the remote controller.

Caused by other parts except

the remote controller

When the mark ( ) is displayed in LCD

screen, replace battery.

Check the contact of CN-DISP 1, 2 connector

Check DISP P.C.B Ass'y

-Voltage between CN-DISP1 ③ - ⑧ : DC +5V

Check point

• Check the connecting circuit between

MICOM PIN ㉗ and CN-DISP1 PIN ⑦

• Check receiver ass'y

Product doesn't operate with the remote controller.

Trouble 2

- 30 -

Part 4 Trouble Shooting

Turn on the main power.

When in air circulation mode, compressor/outdoor fan is stopped.

Turn off main power.

Check the electrical wiring diagram of Outdoor side. Check the open or short of connecting wires between Indoor and Outdoor.

Check the sensor for Indoor temperature is attached as close as to be effected by the temperature of Heat Exchange (EVA.)

When displaying Error code, refer to the trouble shooting guide.

Check the main power source.(AC 208V~230V)

Check the trouble shooting guide error code 21,26.

Check that CN_FAN(A,B) supplied voltage to outdoor PCB is about AC 208V~230V.

Check that whether the housings and harnesses would be separated when there are attempts to disconnect those.

Check to pull with hands directly to the harness.

No harness should be divided from the housing.

Operate Cooling Mode by setting the desired temperature of the remote controller is less than one of the Indoor temperature by 1°C at least.

The Compressor/Outdoor Fan don't operate

Trouble 3

- 31 -

Part 4 Trouble Shooting

When indoor Fan does not operate

Trouble 4

Check the SSR high speed operation by remote control.

(the Indoor Fan Motor is connected)

Turn off main power.

Check the connection of CN-FAN.

Check the Fan Motor.

Check the Fuse(AC250V, T2A).

Turn on the main power

Check the related circuit of indoor Fan Motor.

• The pin No. 38of micom and the part for driving SSR.(Q01M)

• Check the related pattern.

• Check the SSR.

- SSR Open: Indoor Fan Motor never operate.

- SSR short: Indoor Fan Motor always operates in case of ON or OFF.

• Check the connectors.

• Check that whether the housings and harnesses would be separated when there are attempts to disconnect those.

• Check to pull with hands directly to the harness.

• No harness should be divided from the housing.

The voltage of Pin No 1(orange) and 3(black) of CN-FAN.

About AC 160V over About AC 50V over

SSR is not damaged Check SSR

- 32 -

Part 4 Trouble Shooting

7. Self-diagnosis Function

■ Error Indicator

• The function is to self-diagnosis airconditioner and express the troubles identically if there is any trouble.

• If more than two troubles occur simultaneously, primarily the highest trouble of error code is expressed.

• After error occurrence, if error is released, error LED is also released simultaneously.

• To operate again on the occurrence of error code, be sure to turn off the power and then turn on.

• Having or not of error code is different from Model.

■ Indoor Unit Error

1. SW, SB, SC, SH, S4, S5 Chassis

1) SW, SB, SC, Chassis 2) S4, S5 Chassis (4 LED Model)

1 Digit

10 Digit

LED1

(1 Digit)

LED2

(10 Digit)

Ex) Error Code 5 (Communication Failure)

LED1 (1 Digit)

LED2 (10 Digit)

LED1 (1 Digit)

LED2 (10 Digit)

3) SH Chassis

2. SE Mirror, S8, SD, SM, SN Chassis

Error code

Description

Error indication

Indoor unit

LED1 LED2 1 Indoor Sensor (Air) open/short 1 Time 2 Indoor Sensor (Entry Pipe) open/short 2 Times 4 Float Switch Error 4 Times 5

Communication Failure (Indoor Unit ↔ Outdoor Unit)

5 Times 6 Indoor Sensor (Exit Pipe) open/short 6 Times 9 EEPROM ERROR (Indoor Unit) 9 Times -

10 Indoor Unit Fan Lock (Operation Failure) - 1 Time 12 Indoor Sensor (Middle Pipe) open/short 2 Times 1 Time

Part 4 Trouble Shooting

- 33 -

3. SF Chassis (1 LED Model)

4. S3 Chassis (Lighting Model)

Error code Description

1 Indoor Sensor (Air) open/short 2 Indoor Sensor (Entry Pipe) open/short 4 Float Switch Error 5

Communication Failure (Indoor Unit ↔ Outdoor Unit)

6 Indoor Sensor (Exit Pipe) open/short

9 EEPROM ERROR (Indoor Unit) 10 Indoor Unit Fan Lock (Operation Failure) 12 Indoor Sensor (Middle Pipe) open/short

LED1

2sec 2sec

2times 2times 2times

Ex) Error Code 2 : Indoor Sensor(Entry Pipe) open/shot)

1time 2times

2sec 3sec 2sec

2times1time

Ex) Error Code 12 : Indoor Sensor(Middle Pipe) open/short

10 Digit

1 Digit

Part 4 Trouble Shooting

- 34 -

■ Outdoor Unit Error

1) 2 LED Type

LED2 (Red, 10 Digit)

LED1 (Green, 1 Digit)

Error Code

Description

21 DC Peak (IPM Fault) 2 Times 1 Time 2 Times 1 Time 22 CT 2(Max CT) 2 Times 2 Times 2 Times 2 Times 23 DC Link Low Volt 2 Times 3 Times 2 Times 3 Times 25 Low wire volt/ high wire volt 2 Times 5 Times 2 Times 5 Times 26 DC Comp Position Error 2 Times 6 Times 2 Times 6 Times 27 PSC Fault Error 2 Times 7 Times 2 Times 7 Times 29 Inverter Compressor over-current 2 Times 9 Times 2 Times 9 Times 31 CT error (low current) 3 Times 1 Time 3 Times 1 Time 32 D-Pipe High (INV) 3 Times 2 Times 3 Times 2 Times 37 Failure Compression Ratio 3 Times 7 Times 3 Times 7 Times 40 CT Sensor (Open / Short) 4 Times - 4 Times 41 INV. D-Pipe Th Error (Open / Short) 4 Times 1 Time 4 Times 1 Time 44 Outdoor Air Th Error (Open / Short) 4 Times 4 Times 4 Times 4 Times 45 Cond. Middle Pipe Error (Open / Short) 4 Times 5 Times 4 Times 5 Times 48 Cond. Out Pipe Error (Open / Short) 4 Times 8 Tiems 4 Times 8 Tiems 53 Communication Failure(Outdoor Unit ↔ Indoor Unit) 5 Times 3 Times 5 Times 3 Times 60 EEPROM Check Sum Error 6 Times - 6 Times 61 Cond. Pipe High 6 Times 1 Time 6 Times 1 Time 62 Heatsink High 6 Times 2 Times 6 Times 2 Times 63 Cond. Pipe Low 6 Times 3 Times 6 Times 3 Times 65 Heatsink Th Error (Open/Short) 6 Times 5 Times 6 Times 5 Times 67 Outdoor BLDC Fan Lock 6 Times 7 Times 6 Times 7 Times 72 Failure 4Way 7 Times 2 Times 7 Times 2 Times 73 IGBT Damage 7 Times 3 Times 7 Times 3 Times

Error Indication

Indoor Unit Outdoor Unit

LED2 LED1 Red Green

Part 4 Trouble Shooting

- 35 -

2) 1 LED Type

Red LED

2sec2sec2sec2sec

1sec1sec1sec1sec

Ex) Error Code 21 (DC Peak)

Error Code

Description

Error Indication

Indoor Unit Outdoor Unit

LED2 LED1 Red Red

Error Code

Description

Error Indication

Indoor

Operation

Indoor Outdoor

Indoor Temperature Sensor Error

- Suction Sensor open/short

- Indoor Pipe Sensor open/short

●

- Operation

Outdoor Temperature Sensor Error

- Suction Sensor open/short

- Outdoor Pipe Sensor open/short

● ●

Operation

Humidity Temperature Sensor Error

- Humidity Sensor short

● ●

Operation

Heat Sink Temperature Sensor Error

- Temperature Sensor open/short

- Compressor-off Temperature ≤ Heat Sink Temperature

● ●

Operation

Poor Communication(Indoor <-> Outdoor Unit)

- The communication is stopped for more than 2 minutes.

● ●

Stop

DC Peak Error

- DC Peak occurred

● ●

Shutdown

CT Error

- CT detected

● ●

Shutdown

Indoor Unit Fan Lock Error

- Fan Lock occurred (BLDC Motor)

●

- Stop

Outdoor Unit Fan Lock Error

- Fan Lock occurred(BLDC Motor)

● ●

Stop

Compressor Dome Temperature Error

- Discharge Pipe Sensor open/short

- Compressor-off Temperature ≤ Discharge Pipe Temperature

● ●

Operation

EEPROM Error

- EEPROM Check sum Error

●

Operation

PSC Error

- PSC Fault Error

●

Operation

Compressor Phase Current Error

- Phase over-current occurred

●

Operation

Part 4 Trouble Shooting

- 36 -

■ Old Model Error

Ex) Error Code 6 : DC Peak Error Ex) Error Code 13 : PSC Error

6times

3sec

1time 3times 1time

3sec

3times

Part 4 Trouble Shooting

- 37 -

■ Troubleshooting Guide (Indoor Unit)

Part 4 Trouble Shooting

- 38 -

Measure resistance

Refer to Check Point

Resistance is adequate?

Sensor OK

Resistance (White)

200~165㏀@25~30°C

Resistance (Black)

10~8㏀@25~30°C

Resistance (Blue)

5~4㏀@25~30°C

Yes

Replace Sensor

❏ Discharge Pipe Temp Sensor (200㏀)

❏ Air/Room Temp. Sensor (10㏀)

❏ Indoor Pipe Temp. Sensor (5㏀)

Check Point

1. 10k Ω / at 25℃(77℉)±10%

2. 5k Ω / at 25℃(77℉)±10%

3. 200k Ω / at 25℃(77℉)±10%

Check Method

❈ For more information, please refer to the 38 page table.

Part 4 Trouble Shooting

- 39 -

Resistance - Temp. Sensor Table

Temp (℃/℉)

Resistance(KΩ)

Air Sensor s-Pipe Sensor D-Pipe Sensor

-30/-22 204.35 102.17 -

-25/-13 146.97 73.49 -

-20/-4 107.09 53.55 -

-15/5 79 3950 -

-10/14 58.95 29.48 -

-5/23 44.47 22.24 0/32 33.9 16.95 585.66 5/41 26.09 13.05 465.17

10/50 20.27 10.14 372.49 15/59 15.89 7.94 300.58 20/68 12.55 6.28 244.33 25/77 10 5 200 30/86 8.03 4.01 164.79

35/95 6.49 3.24 136.64 40/104 5.28 2.64 113.98 45/113 4.32 2.16 95.62 50/122 3.56 1.78 80.65 55/131 2.95 1.48 68.38 60/140 2.46 1.23 58.27 65/149 2.06 1.03 49.88 70/158 1.74 0.87 42.9 75/167 1.47 0.74 37.05 80/176 1.25 0.63 32.14 90/194 0.92 0.46 24.46

100/212 0.68 0.34 18.89

Part 4 Trouble Shooting

- 40 -

Check Point

1. Check the wire connection. (Open, Soldered poorly) → Repair the connection or change the PCB.

2. Check the resistance of float switch (Abnormal : Open, Normal : short) → Check the float switch.

3. Check the level of water.

Check the level of

water (Float moves top

position)

Is it normal ?

Check the wire

connection (Open,

Soldered poorly)

Is the float

switch clean ?

Yes

No Check float switch

No Clean float switch

Is the resistance of f

loat switch normal

(short) ?

Yes

No Change the float switch

Is it normal ?

No Correct connection Or re-soldering PCB

Check Flow Chart

CH04

Float switch

• Float switch open. (Normal : short)

• Water over flow

• The connection of wire (Float switch)

• Indoor unit installation. (Inclination)

Inspection

Number

Description of

Inspection

Cause of Error Check Point

Part 4 Trouble Shooting

- 41 -

(verify with hands)

Part 4 Trouble Shooting

- 42 -

(pulling by hand to check connection status)

• Repair or replace the harness.

• Connect certainly

(pulling by hand to check connection status)

• Verify with hands certainly

Pin and wire disconnection or pressed

Part 4 Trouble Shooting

- 43 -

Check that whether the housings and harness would be separated by pulling those with hands directly.

• Remedy : replace PCB Assembly.

caution

■ Trouble Shooting Guide [Outdoor Unit (2 LED Type)]

1) CH21: DC Peak Error

Part 4 Trouble Shooting

- 44 -

Case of field defect

❏ IPM (Over Current Limit) ❏ Bending/Folding ❏ SVC Valve close

Part 4 Trouble Shooting

- 45 -

caution

Check that whether the housings and harness would be separated by pulling those with hands directly.

2) CH22: CT2 Error (Input Over-current)

Part 4 Trouble Shooting

- 46 -

3) CH23: DC Link Low Voltage Error

Part 4 Trouble Shooting

- 47 -

4) CH26: DC Comp Location Sensing Error

caution

Check that whether the housings and harness would be separated by pulling those with hands directly.

Part 4 Trouble Shooting

- 48 -

5) CH27: PSC Fault Over-current Error

Check that whether the housings and harness would be separated by pulling those with hands directly.

caution

Part 4 Trouble Shooting

- 49 -

6) CH29: Compressor phase Over-current Error (only verifiable at Outdoor unit PCB Assembly)

Check that whether the housings and harness would be separated by pulling those with hands directly.

caution

Part 4 Trouble Shooting

- 50 -

7) CH32: Inverter Compressor D-Pipe Overheat Error

Check that whether the housings and harness would be separated by pulling those with hands directly.

caution

Part 4 Trouble Shooting

- 51 -

8) CH40: CT Sensor Error (Open/Short)

Te st e r

Part 4 Trouble Shooting

- 52 -

9) CH41/44/45/65: Inv D-Pipe/Outdoor Inlet/Cond. Pipe/Heat sink Sensor Error

Part 4 Trouble Shooting

- 53 -

10) CH53: Outdoor Unit <-> Indoor Unit Communication Error

Part 4 Trouble Shooting

- 54 -

11) CH60: Outdoor Unit PCB EEPROM Error

• Remedy : reassemble EEPROM / Replace PCB Assembly

ڹں

Check Method

Part 4 Trouble Shooting

- 55 -

12) CH61: Cond. Pipe Overheat Error

Check that whether the housings and harness would be separated by pulling those with hands directly.

caution

(Fan constraint,

Heat exchanger contaminated

Part 4 Trouble Shooting

- 56 -

13) CH62: Heat Sink Overheat Error

Part 4 Trouble Shooting

- 57 -

14) CH67: Outdoor BLDC Fan Lock Error

Case of field defect

❏ BLDC Fan Motor (short)

Part 4 Trouble Shooting

- 58 -

■ Trouble Shooting Guide [Outdoor Unit(1 LED Type)]

1) CH21: DC Peak Error

Check that whether the housings and harness would be separated by pulling those with hands directly.

caution

Part 4 Trouble Shooting

- 59 -

Resistance between

the lines of each

1.5 ~ 2

U - V V - W W - U

Part 4 Trouble Shooting

- 60 -

Check that whether the housings and harness would be separated by pulling those with hands directly.

caution

2) CH22: CT2 Error (Input Over-current)

Part 4 Trouble Shooting

- 61 -

3) CH23: DC Link Low Voltage Error

Part 4 Trouble Shooting

- 62 -

4) CH26: DC Comp Location Sensing Error

Check that whether the housings and harness would be separated by pulling those with hands directly.

caution

Part 4 Trouble Shooting

- 63 -

5) CH29: Compressor phase Over-current Error (only verifiable at Outdoor unit PCB Assembly)

Check that whether the housings and harness would be separated by pulling those with hands directly.

caution

Part 4 Trouble Shooting

- 64 -

6) CH32: Inverter Compressor D-Pipe Overheat Error

Check that whether the housings and harness would be separated by pulling those with hands directly.

caution

Part 4 Trouble Shooting

- 65 -

7) CH40: CT Sensor Error (Open/Short)

Is AC input

current sensing part

normal?

Check voltage measurement on the input current (Fig.1) at the power-on standby state DC 0V ± 0.2V

DC voltage measurement at the measurement point in figure 2 at power-on standby state -> measured value : within 2.5V ± 0.2V

Is the Comp

phase Current sensor

part normal?

Part 4 Trouble Shooting

- 66 -

8) CH41/44/45/65: Inv D-Pipe/Outdoor Inlet/Cond. Pipe/Heat sink Sensor Error

Part 4 Trouble Shooting

- 67 -

9) CH53: Outdoor Unit <-> Indoor Unit Communication Error

Part 4 Trouble Shooting

- 68 -

10) CH60: Outdoor Unit PCB EEPROM Error

Part 4 Trouble Shooting

- 69 -

11) CH61: Cond. Pipe Overheat Error

Check that whether the housings and harness would be separated by pulling those with hands directly.

caution

Fan

Heat exchanger contaminated

Part 4 Trouble Shooting

- 70 -

12) CH62: Heat Sink Overheat Error

Are the PCB

temperature sensing

parts normal?

Check that whether the housings and harness would be separated by pulling those with hands directly.

caution

Part 4 Trouble Shooting

- 71 -

13) CH67: Outdoor BLDC Fan Lock Error

P/No : MFL41161608

Friedrich AS - W126BMS0 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual