Samsung APH180 Troubleshooting

5. Troubleshooting

Troubleshooting procedures

1• Check the items to check first time.

2• Check the self-diagnostic mode and action method.

3• Check in detail the troubled parts according to the sequence of ”trouble shooting by the phenomena”.

5-1 The items to be checked first time

1)Is proper the power voltage ?

The power voltage shall be of 187V-253V 50Hz.

2)Is the cable connected correctly between the indoor and outdoor unit?

The indoor and outdoor units shall be connected with 8wires including the grounding.

Check whether the wires of indoor and outdoor units are connected with the correct wire no. and terminal board no.

3)The phenomena in the following table is not related to the fault of air conditioner.

No		Phenomena		Description
1		- Heating operaation		- The operation of compressor is delayed for 3minutes for the
		The compressor does not operated even though the set		protection of compressor when it is off and on again.
		temperature is set higher than the indoor temperature.		- The compressor operates nomally after 3 minutes even the lnitial
		- Cooling operation		power is on.
		The compressor does not operated even though the set
		temperature is set lower than the indoor temperature.
2		- Fan speed is not adjusted durning the auto, dry, turbo		- The fan speed is automatically adjusted durning the auto, dry,
		and long operation.		turo and long operation.
3		- The temperature is not adjusted durning the auto,		- The set temperature is automatically set durning the auto, dry
		dry, turbo and long and fan operation.		and long operation.
				- The wind blow operation is the mode to circulate the indoor air.
4		- The compressor repeates the stop and start with the		- At the dry operation, the set temperature and the indoor
		interval of several minutes durning dry.		temperature are compared to adjust the compressor start/stop
				time in order to dehumidify.
5		- Durning the heating operation, the lamp “on deice”		- The deice operation is being performed in order to melt the frost
		is on at the control panel and the compressor		by outdoor unit and its maximum time is 9 minutes.
		oprates.
6		- Durning the heating, the outdoor unit fan motor		- It is the function to prevent the overheating of the indoor
		repeats start/stop or even the compressor repeats		evapolator, where the temperature of indoor unit heat exchanger
		the starts the start snd stop.		reaches 52°C, the normal operation is done.
7		- Durning the heating, the compressor and outdoor		- This is the function to prevent the cooling air incoming to the
		unit fan motor operate but indoor unit fan motor		indoor, where the temperature of indoor evaporator reaches 27°C,
		does not operate.		the indoor fan motor operates.

Samsung Electronics

5-1

5-2 Display of the result of self-diagnostic and check items on the control panel

	No.	Power	Temperature		Cause	Counter measure	Remark
		lamp	display
		Flickering	E1	- Indoor temperature sensor open		- Check short/open of PCB parts	APH180CD
	1			- Indoor temperature sensor short		- Replacement of temperature sensor	APH180HD
		(1Hz)
							APH180ED
		Flickering		-	Shutter motor defect	- Replacement of shutter motor	APH180CD
	2		E2	-	Shutter sensor defact	- Replacement of shutter sensor	APH180HD
		(1Hz)
				-	Connector wire contact bad	- Replacement of connector wire	APH180ED
		Flickering		- Indoor evaporator sensor open		- Check short/open of PCB parts	APH180HD
	3		E5	- Indoor evaporator sensor short		- Replacement of temperature sensor	APH180ED
		(1Hz)
				- Indoor condensor sensor open		- Check short/open of PCB parts	APH180HD
	4	Flickering	E6	-	Indoor condensor sensor short	- Replacement of sensor	APH180ED
		(1Hz)		- Connector wire contact bad		- Replacement of connector wire
				-	Electric heater sensor open	- Check short/open of PCB parts	APH180ED
	5	Flickering	E7	-	Electric heater sensor short	- Replacement of temperature sensor
		(1Hz)
				- Electric heater overheated		- Check the overheating sensor	APH180ED
	6	Flickering	EC	-	Indoor fan motor stocked	- Remove the cause of the indoor fan
		(1Hz)		-	Indoor fan motor fault	motor stocking
						- Replacement of indoor fan motor

“E1”AND “E2” ARE DISPLAYED ON THE TEMPERATURE DISPLAY ONLY WHEN THE OPERATION STOPS.

5-2	Samsung Electronics

5-3 Trouble shooting by phenomena

5-3-1 When it is not Power on.(When it is not display)

1) Trouble cause

1When the power voltage is out the operating range or the power cable contact is bad.

2The transformer is defect or it’s connection is bad.

3The fuse of main PCB is broken or the PCB with a defect.

4The panel PCB has it’s defect.

•The knob switch with a poor assembly, V.F-display defect.

2)Check items

1Is the power voltage normal?(AC 187V~AC 253V)

2Is the contact of power cable good?

3Is the power fuse(F701, F702) AND PCB fuse(F101)not disconnected?

4Is the contact of connector at primary and secondary side of power transformer?

5Is the output voltage of IC08(KA7812) normal?(DC 11.5~DC 12.5V)

6Is the output voltage of IC09(KA7805) normal?(DC 4.5~DC 5.5V)

7Is the connection of harness(wire connector-control)of main PCB panel good?

3)Sequence of check

Turn off the power, and then turn it on in 5 seconds.

Y

Is the display part on dose the door operate

Normal operation of set.

when pressing the start key?

		N	N	Check the connection harness of indoor and
	Is the voltage of the power input part(CN71 red-white)
	AC 187~AC 253V?			replace.

Y

N

Is the secondary voltage of power transformer correct?

Check the power trancsfornmer and replace it.

blue-white:AC14~17V,red-red:AC4~5V black-white:AC14~17V

Y

Is the output voltage of IC08, and IC09 normal?	N		Check the main PBC and replace it.
(IC08=12V, RIC09=5V)

		Y	N
	Dose the remocon receive the singnal correctly?
					Check the knob key.

N

Replace it due to the defact of main PCB.

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5-3

Troubleshooting

5-3-2 When the electric heater does not Operate

1) The cause of trouble

Open of the electric heater

Open of the electric heater connection wire or bad contact Main PCB defect(RY84, IC03, MICOM)

Open of manual reset type temperature fuse

The electric heater driving power relay is defected

2) Check items

Does the set temperture not adjust lower temperature than the current it? Is the power voltage correct?(187V-253V)

Is the contact of the electic heater connection wire OK? Is the manual reset type temperature fuse closed?

Is the contact of the wire connected to the power relay terminal for electric heater good?

3) Sequence of check

Turn off the power, and then turn it on in 5 seconds.

Operate the start/stop key and operation selection key to execute the heating operation.

Operate the temperature setting key to adjust the set temp to 3˚C the higher temp than the current it.

Does the heater operate 3 seconds after the operation of indoor fan motor?

N

Is it hige when checking the output wave of the pin no. 13 of MICOM(IC01)?

(Check condition when the heater is on) Y

Is the voltage across the replay(RY84)DC 12V? (Check condition when the heater is on.)

Y

Is the the voltage across the power relay coil AC 220V? (Check condition when the heater is on.)

Y

Is the the voltage of the connected terminal to the electric heater AC 220V?

(Check condition when the heater is on.) N

Y

Electric heater and the power relay are good.

N

Check MICOM(IC01) and replace it.

N

Check IC03 and replace it.

N

Wrong connection of wire and check the wire disconnection or bad contact.

N

Check the power relay and replace it.

Check the electric heater and replace it

5-4	Samsung Electronics