REMKO SuperTec-Monitor User Manual

SYSTEM MONITOR

FOR REMKO SUPERTEC INVERTER

Operation · Fault codes · Troubleshooting

Edition GB – W12

Contents

Safety notes

Environmental protection and recycling

Warranty

Transport and packaging

System description

Decommissioning

Operation

Settings of the system components

Troubleshooting/Fault codes

4

4

4

5

5

6

6

7-19

20-31

Made by REMKO

Read this installation manual carefully before
commissioning / using the device!

These instructions are an integral part of the system and must always
be kept in the vicinity of the installation location or on the
unit itself.
This operating manual is a translation of the German original.

Subject to modifications; no liability accepted for errors or misprints!

3

REMKO SYSTEM MONITOR

FOR REMKO SUPERTEC INVERTER

Safety notes

Carefully read the operating manu­al before placing the unit in service
for the first time. It contains useful
tips and notes such as ha�-ha�­ard warnings to prevent injury and
material damage. Failure to follow
the directions in this manual can
result in endangerment to persons,
the environment and the equip­ment itself and will void any claims
for liability.

■ Keep this manual and the re-

frigerant data sheet near to the
units.

■ The units and components

should be set up and installed
only by qualified personnel.

■ The set-up, connection, and

operation of the units and their
components must be in accord­ance with the operating condi­tions stipulated in this manual
and comply with all applicable
local regulations.

■ Mobile units must be set up

securely on suitable surfaces and
in an upright position. Station­ary units must be permanently
installed before operation.

■ Modification of units and com-

ponents supplied by REMKO
is not permitted and can cause
malfunctions.

■ Units and components may

not be operated in areas where
there is an increased risk of
damage. Observe the minimum
clearances.

■ The electrical supply is to be

adapted to the requirements of
the units.

■ The operational safety of the

units and components is only as­sured if they are fully assembled
and used as intended. Safety
devices may not be modified or
bypassed.

■ Do not operate units or compo-

nents with obvious defects or
signs of damage.

■ All housing parts and openings

in the unit, e.g. air intakes and
outlets, must be free of foreign
objects, fluids, or gases.

■ The units and components must

be kept an adequate distance
from flammable, explosive,
combustible, abrasive and dirty
areas or atmospheres.

■ Touching some parts of the unit

can result in burns or other inju­ries.

■ Installation, repair and mainte-

nance work may be carried out
only by authorised specialists.
Visual inspections and cleaning
can be performed by the opera­tor as long as power is discon­nected from the equipment.

■ To preclude any danger from the

unit, take appropriate ha�ard­prevention measures when
performing installation, repair or
maintenance work or cleaning
the units.

■ The units or components

are not to be exposed to any
mechanical stresses, extreme
levels of humidity or direct
sunlight.

Environmental
protection
and recycling

Disposing of packaging

All products are packed for trans­port in environmentally friendly
materials. You can make a valuable
contribution to reducing waste and
sustaining raw materials by only
disposing of packaging at ap­proved collection points.

Disposing of the units and
their components

Only recyclable materials

are used in the manufac­ture of the units and components.
Help protect the environment by
ensuring that the units or com­ponents (for example batteries)
are not disposed of in household
waste, but only in accordance with
local regulations and in an environ­mentally safe manner, e.g. using
authorised disposal and recycling
specialists or council collection
points.

Warranty

The precondition for possible
warranty claims is that the
ordering party or their representa­tive
fully complete the warranty reg­istration card and commissioning
report included with the unit, at
the time when the equipment is
purchased and commissioned,
and return it to
REMKO GmbH & Co. KG.

The warranty conditions are listed
in the "General terms and condi­tions". Furthermore, only the par­ties to a contract can strike special
agreements beyond these condi­tions. For this reason, please
contact your contract partner
in the first instance.

4

Transport and
packaging

The equipment is delivered
in sturdy transport packaging.
Immediately check the equipment
on delivery and make note of any
damage or missing parts on the
delivery note and inform the for­warding agent and your contractual
partner.
No warranty can be assumed for
later claims.

Description

With the REMKO SYSTEM
MONITOR, REMKO is offering
an external display unit for CMF/
CMT outdoor units, which makes
it both simple and convenient
to query operating data from all
system components. The REMKO
SYSTEM MONITOR is equipped
with a DIP switch (SW2) and a
two-digit, seven-segment LED
display. During fault-free normal
operation this shows the operating
status, and in the event of a fault
shows details on which faults have
occurred on the various system
components. Using DIP switch
SW2 on the REMKO SYSTEM
MONITOR, is it possible to per­form targeted diagnostics. To do
so, it is necessary to connect the
supplied cable to the CNM con­nector on the control board of the
CMF/CMT outdoor unit. In the
following pages, you will find the
settings for SW2 and the associ­ated normal value ranges of the
system monitor.

SYSTEM MONITOR for REMKO SuperTec Inverter

The REMKO SYSTEM MONITOR
offers you the option to monitor
your system components electroni­cally on the outdoor unit. You can
query the operating data of all sys­tem components, enabling you to
perform targeted troubleshooting,
and quickly and easily resolve the
cause of the fault. In the following
text, this function is identified as
the System Monitor, which offers
targeted querying of temperatures,
pressures, voltages, etc.

NOTE

NOTE

DIP switch SW2 is located on
the circuit board of the
REMKO SYSTEM MONITOR

The REMKO SYSTEM MONI­TOR is not included in the
scope of delivery of the inverter
heat pump, and must be or­dered separately. The REMKO
SYSTEM MONITOR can be
used with all outdoor units in
the CMF/CMT range.
You can find a detailed list of
all the fault codes from
page 18 onwards

5

REMKO SYSTEM MONITOR

FOR REMKO SUPERTEC INVERTER

Decommissioning Operation

■

Shut down the system using the
heat pump manager.

■

Switch off the power supply of
the outdoor unit.

■

Remove
tor for the SYSTEM MONITOR
from the CMN socket on the
control board of the outdoor
unit.

■

Switch the power supply of the
outdoor unit back on.

■

Place the system back into
service using the heat pump
manager.

the supplied connec-

SYSTEM MONITOR for REMKO SuperTec Inverter

■

Shut down the system using the
heat pump manager.

■

Switch off the power supply of
the outdoor unit.

■ Remove the right side panel.

This is achieved by undoing
three screws on the panel and
then pulling off the panel in a
downwards direction.

■ Connect the SYSTEM MONI-

TOR using the supplied connec­tor to the CMN socket on the
control board of the outdoor
unit.

■

Switch the power supply of the
outdoor unit back on.

■

Place the system back into
service using the heat pump
manager.

■ DIP switch SW2 allows targeted

diagnostics to be performed

■ From page 7 onwards, you can

find a precise description of the
associated normal value ranges
of the System Monitor.

■ In the event of a fault, you can

find a precise fault description
with cause and remedy under
the "Fault codes" section.

6

DIP switch SW 2
during normal operation

■

Switch off the power supply of
the outdoor unit.

■

To do so, set switches 1-6 of
SW2 to their initial setting. All
switches in the OFF position

Seven-segment LED display

LEDs flash during normal opera­tion

■

Remove

the supplied connec­tor for the SYSTEM MONITOR
from the CMN socket on the
control board of the outdoor
unit.

■

Switch the power supply of the
outdoor unit back on.

■

Place the system back into serv-

ice using the heat pump manager.

The initial setting of DIP switch
SW2 in normal operation looks like
this:

ON

1 2 3 4 5 6

When the power supply is
switched on , the LEDs flash while
the air conditioning system is car­rying out an internal system check.
This lasts max. 4 minutes.

LED display lights up
during normal operation

1. During fault-free normal
operation, and with DIP
switch SW2 1-6 set to OFF,
the first digit of the LED
shows the operating mode
(Off, Cooling, Heating, Defrost)

First digit: operating mode

Display Operating mode

O OFF/Fan

C Cooling/Drying

H Heating

d Defrost

Interval:

1 second

and the second digit shows the
status of the condenser and
solenoid valves.
You can find detailed descrip
tions
in the following tables.

2. If a fault occurs (the
condenser is switched off by
the protective device) the fault
code for the particular fault
appears on the LED display.
This fault code will remain on
the display until the condenser
is restarted.

Second digit: switching position of the control relay, relay output

Display

Preheating

mode

Condenser

Four-way

valve

Solenoid

valve

0 - - - ­1 - - - ON
2 - - ON ­3 - - ON ON
4 - ON - ­5 - ON - ON
6 - ON ON ­7 - ON ON ON

7

REMKO SYSTEM MONITOR

FOR REMKO SUPERTEC INVERTER

LED display flashes when a fault
has occurred

If the condenser is switched off by
a protective device after a fault
has occurred, the LED display al­ternates between showing the unit
address of the air conditioner in
question and the fault code.

Display Description (during operation)

U1 Fault on the high pressure switch, 63H was triggered
U2 Hot gas temperature too high, lack of refrigerant
U3 Hot gas temperature sensor TH 4 detected open circuit /short-circuit
U4 Temperature sensor TH3, TH6, TH7, TH8 in outdoor unit detected open circuit/short-circuit
U5 Cooling fin temperature sensor detected open circuit/short-circuit
U6 Fault in the power module (inverter)
U7 Overheating fault; hot gas temperature too low
UF Condenser stopped due to overcurrent (condenser disabled)

UH Fault on the current sensor

UL Fault on the low pressure switch, 62L was triggered
UP Condenser stopped by overcurrent

A0-A7 Data transmission fault: priority signal on the M-net

Address of the

malfunctioning

air conditioner

Interval:

1 second

Fault code

Display Description (during operation)

F3 Connector 63L (red) is disconnected
F5 Connector 63H (yellow) is disconnected
F9 Both connector 63L and 63H are disconnected
E8 Data transmission fault: outdoor unit is not receiving any signals from the indoor unit
E9 Data transmission fault: outdoor unit is not transmitting any signals to the indoor unit

EA Wiring fault in the interior/exterior control cables: too many indoor units (max. 4)

Eb Wiring fault in the interior/exterior control cables: polarity reversed, cable detached
Ec Timeout on system startup

E0-E7 Data transmission fault: other without outdoor unit

8

Switch assignment of DIP switch SW2

Setting on SW2 System component Measuring range and description Unit

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6

Line temperature TH3

-40 – 90

Hot gas temperature TH4
3 – 217

-40 – +90
If the temperature sensor
measures values below 0°C,
the display switches between
the sign, the value,
and 2 spaces.

Example: TH3 = -10°C:

0.5 s 0.5 s 2 s
„- “ „10“ „ “

3 – 217
If the temperature sensor
measures values above 99°C,
the display switches between
the 100s digit, 10s and 1s dig­its, and 2 spaces.

Example: TH4 = 105°C:

0.5 s 0.5 s 2 s
„ 1“ „05“ „ “

°C

°C

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6

Fan speed (outdoor unit)
0 – 10

Number of switch on/off pro­cedures of the condenser
0 – 9999

0 – 10

0 – 9999
If the number is above 99, the
display switches between
the 100s digit, the 10s and 1s
digits, and 2 spaces.
Ex­ample: 42500 switching proc.:
425 × 100

0.5 s 0.5 s 2 s
„ 4“ „25“ „ “

Levels /
Steps

X 100

9

REMKO SYSTEM MONITOR

FOR REMKO SUPERTEC INVERTER

Setting on SW2 System component Measuring range and description Unit

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6

Condenser operating time
0 – 9999

Operating current of the con­denser
0 – 50

0 – 9999
If the number is above 99, the
display switches between
the 100s digit, the 10s and 1s
digits, and 2 spaces.

Example: 245:

0.5 s 0.5 s 2 s
„ 2“ „45“ „ “

0 – 50 (without decimal places) A

10 hrs

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6

Condenser operating frequency
0 – 225

Opening width of the LEV-A
0 – 480

0 – 225
If the condenser operating
frequency is over 99,
the display switches between
the 100s digit, 10s and 1s dig­its, and 2 spaces.

Example: 125 H�:

0.5 s 0.5 s 2 s
„ 1“ „25“ „ “

0 – 480
If the opening width of the
LEV-A is over 99 impulses,
the display switches between
the 100s digit, the 10s and 1s
digits, and 2 spaces.
Ex­ample: 150 impulses:

0.5 s 0.5 s 2 s
„ 1“ „00“ „ “

H�

Impulses

10

Setting on SW2 System component Measuring range and description Unit

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6

New fault message on the
outdoor unit (1)
The last message in the fault
list is deleted, and the remain­ing messages are moved
down one.

Operating mode before fault
stop

Fault message "00" is not
moved „00“
Flashing: fault message will be
moved
Constant: movement cancelled

Code for operating mode be­fore fault stop
Fault code is displayed if all
switches on DIP switch
SW2 are in the OFF position.

ON

1 2 3 4 5 6

Fault code

ON

112233445

ON

Line temperature TH3 before
fault

-40 – 90

6

Condenser or hot gas tempera­ture
TH4 before fault

5

6

3 – 217

-40 – +90
If the temperature sensor
measures values below 0°C,
the display switches between
the sign, the value, and 2
spaces.
Ex­ample: TH3 = -15°C:

0.5 s 0.5 s 2 s
„- “ „15“ „ “

3 – 217
If the temperature sensor
measures values above 99°C,
the display switches between
the 100s digit, 10s and 1s dig­its, and 2 spaces.

Example: TH4 = 130°C:

0.5 s 0.5 s 2 s
„ 1“ „30“ „ “

°C

°C

11

REMKO SYSTEM MONITOR

FOR REMKO SUPERTEC INVERTER

Setting on SW2 System component Measuring range and description Unit

ON

1 2 3 4 5 6

ON

1

2

3

4

5

Operating current of the con­denser before fault
0 – 20

List of the latest
faults (1)
Alternating display of unit ad­dress and fault code

0 – 20 A

If there are no fault messages,
the display switches
between
"00" and "– –"

Fault code

6

ON

1

ON

1

List of older faults (2)
Alternating display of unit ad­dress and fault code

2

3

4

5

6

Duration of test operation
0 – 120

2

3

4

5

6

If there are no fault messages,
the display switches
between
"00" and "– –"

0 – 120
If the duration is over 99 min.,
the display switches
between the 100s digit, the
10s and 1s digits,
and 2 spaces.

Example: 105 min.:

0.5 s 0.5 s 2 s
„ 1“ „05“ „ “

Fault code

Minutes

12

Setting on SW2 System component Measuring range and description Unit

ON

1 2 3 4 5 6

ON

1

2

3

4

5

Unit output Display takes the form of a

capacity code

Unit output: capacity code
CMF80/90: 14
CMF 140/150: 25
CMT100: 14
CMT150: 25

Settings on the outdoor unit

1s digit:
(Defrosting mode)
0 = Standard
1 = For high humidity

Capacity code

6

10s digit
(Operating mode)
0 = Heat pump
1 = Cooling unit

(Single/three-phased)
0 = Single-phased
2 = Three-phased

ON

1

ON

1

Temperature sensor TH2

-39 – 88

2

3

4

5

6

Vaporiser/condenser tempera­ture sensor of the indoor unit
TH5

2

3

4

5

6

-39 – 88

-39 – +88
If the temperature sensor
measures values below 0°C,
the display switches between
the sign and the value.

-39 – +88
If the temperature sensor
measures values below 0°C,
the display switches between
the sign and the value.

°C

°C

13

REMKO SYSTEM MONITOR

FOR REMKO SUPERTEC INVERTER

Setting on SW2 System component Measuring range and description Unit

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6

Heat exchanger temperature
sensor on the outdoor unit
(two-phase mixture) TH6

-39 – 88

Outdoor temperature TH7

-39 – 88

-39 – +88
If the temperature sensor
measures values below 0°C,
the display switches between
the sign and the value.

-39 – +88
If the temperature sensor
measures values below 0°C,
the display switches between
the sign and the value.

°C

°C

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6

Cooling fin temperature sensor
TH8

-40 – 200

Hot gas overheating tempera­ture SHd
0 – 255
Cooling: TH4 - TH6
Heating: TH4 - TH5

-40 – +200
If the temperature sensor
measures values below 0°C,
the display switches between
the sign and the value.
If the temperature is over
99°C, the display switches
between the 100s digit and the
10s and 1s digits.

0 – 255
If the temperature difference is
over 99 K, the display
switches between the 100s
digit and the 10s and 1s
digits.

°C

K

14

Setting on SW2 System component Measuring range and description Unit

ON

1 2 3 4 5 6

ON

1

2

3

4

5

Subcooler temperature SC
0 – 130
Cooling: TH6 - TH3
Heating: TH5 - TH4

Operating current of the in­door unit
0 – 500

6

0 – 130
If the temperature difference is
over 99 K, the display switches
between the 100s digit and the
10s and 1s digits.

0 – 500
If the number is above 99, the
display switches between
the 100s digit and the 10s and
1s digits.

K

0.1A

ON

1

ON

1

Opening width of the LEV B
0 – 480

2

3

4

5

6

Target operating frequency
0 – 255

2

3

4

5

6

0 – 480
If the opening width is over 99
impulses, the display
switches between the 100s
digit and the 10s and 1s
digits.

0 – 255
If the operating frequency is
over 99 H�, the display
switches between the 100s
digit and the 10s and
1s digits.

Impulses

H�

15

REMKO SYSTEM MONITOR

FOR REMKO SUPERTEC INVERTER

Setting on SW2 System component Measuring range and description Unit

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6

DC bus voltage
CMF 80/90/140/150
CMT 100/150

180 - 370

Fault on the temperature sen­sor
If no temperature sensor fault
has occurred,
"—" appears on the
LED display.

180 – 370
If the voltage is over 99 V, the
display switches
between the 100s digit1
and the 10s and 1s digits.

3 = Liquid line on the
outdoor unit TH3, TH32

6 = two-phase line
(condenser/vaporiser)
on the outdoor unit TH6

7 = Outdoor air temperature
TH7

8 = Cooling fin temperature
sensor TH8

°C

Code

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6

Condenser operating frequency
before fault
0 – 255

Fan speed before fault
0 – 10

0 – 255
If the operating frequency is
over 99 H�, the display
switches between the 100s
digit, the 10s and 1s digits,
and 2 spaces.

Example: 125 H�:

0.5 s 0.5 s 2 s
„ 1“ „25“ „ “

0 – 10 Levels /

H�

Steps

16

Setting on SW2 System component Measuring range and description Unit

ON

1 2 3 4 5 6

ON

1

2

3

4

5

Opening width of the LEV A
before fault
0 – 480

Line temperature of the
outdoor unit TH33 before fault

-39 – 88

6

0 – 480
If the opening width is over 99
impulses, the display switches
between the 100s digit, the
10s and 1s digits,
and 2 spaces.

Example: 130 impulses:

0.5 s 0.5 s 2 s
„ 1“ „30“ „ “

-39 – +88
If the temperature sensor
measures values below 0°C,
the display switches between
the sign and the value.

Impulses

°C

ON

1

ON

1

Vaporiser/condenser tempera­ture sensor of the indoor unit
TH5 before fault

2

3

4

5

6

2

3

4

5

6

-39 – 88

Heat exchanger temperature
sensor of the outdoor unit TH6
(two-phase mixture)
before fault

-39 – 88

-39 – +88
If the temperature sensor
measures values below 0°C,
the display switches between
the sign, the value,
and 2 spaces.

Example: -15 °C:

0.5 s 0.5 s 2 s
„- “ „15“ „ “

-39 – +88
If the temperature sensor
measures values below 0°C,
the display switches between
the sign, the value, and 2
spaces.
Ex­ample: -15 °C:

0.5 s 0.5 s 2 s
„- “ „15“ „ “

°C

°C

17

REMKO SYSTEM MONITOR

FOR REMKO SUPERTEC INVERTER

Setting on SW2 System component Measuring range and description Unit

ON

1 2 3 4 5 6

ON

1

2

3

4

5

Outdoor temperature TH7
before fault

-39 – 88

Cooling fin temperature sensor
TH8 before fault

-40 – 200

6

-39 – +88
If the temperature sensor
measures values below 0°C,
the display switches between
the sign, the value,
and 2 spaces.
Ex­ample: -15 °C:

0.5 s 0.5 s 2 s
„- “ „15“ „ “

-40 – +200
If the temperature sensor
measures values below 0°C,
the display switches between
the sign, the value, and 2
spaces. If the temperature sen­sor measures values over 99°C,
the display switches between
the 100s digit, the
10s and 1s digits, and 2 spaces.

Impulses

°C

ON

1

ON

1

Hot gas overheating tempera­ture SHd before fault
0 – 255

2

3

4

5

6

Cooling: TH4 - TH6
Heating: TH4 - TH5

Subcooler temperature SC
before fault
0 – 130

2

3

4

5

6

Cooling: TH6 - TH3
Heating: TH5 - TH2

0 – 255
If the temperature difference is
over 99 K, the display switches
between the 100s digit, the
10s and 1s digits, and 2 spaces.

Example: 150 K:

0.5 s 0.5 s 2 s
„ 1 “ „50“ „ “

0 – 130
If the temperature difference is
over 99 K, the display switches
between the 100s digit, the
10s and 1s digits, and 2 spaces.

Example: 115 K:

0.5 s 0.5 s 2 s
„1 “ „15“ „ “

K

K

18

Setting on SW2 System component Measuring range and description Unit

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6

Switch-on duration until
fault
0 – 999

U9: Fault status during the
fault

0 – 999
If the duration is over 99 min.,
the display switches
between the 100s digit, the
10s and 1s digits, and
2 spaces.

Example: 415 min.:

0.5 s 0.5 s 2 s
„ 4“ „15“ „ “

00 No fault

01 Voltage too high
(voltage board)

02 Voltage too low
(control board)

04 L-phase fault
(control board)

08 Operating signal fault
(voltage board)

Minutes

Code

10 PFC fault

-Overvoltage

-Undervoltage

-Overcurrent
(voltage board)

20 PFC/ACTM fault

-Undervoltage
(check wiring from CNAF,
ACTM defective

Examples of multiple faults:
03 Overvoltage (01) and und­ervoltage (02)

0A Under voltage (02) and
operating signal fault (08)

14 L-phase fault (04) and PFC
fault (10)

19

REMKO SYSTEM MONITOR

FOR REMKO SUPERTEC INVERTER

Fault codes

Please note the following when a fault message is issued:

In the event of a communication error, the information from the LED
indicators of the outdoor unit and that on the display of the REMKO
SYSTEM MONITOR may differ, or the outdoor unit may not show a fault
at all.
If a fault occurs, you can determine its cause from the following tables.

Fault code display

LED 1 (green) LED 2 (red) Display

F1

Flashes
once

F2

F3

Phase fault detected

Phase fault, wiring fault between indoor/outdoor unit

Phase fault detected

Open L3-phase detected

Connector 63L open

No contact detected from 63L for 3 min.

Description

! CAUTION

When a fault occurs, the fault
code is issued on the outdoor
unit using flashing codes on
two LEDs

Flashes once

Flashes twice

Flashes
twice

Flashes 3
times

Flashes
once

Flashes
twice

F4

F5

F9

FA

F7

F8

EA Wiring fault between indoor and outdoor unit

Eb

E8

E9

Connector 49C open

No contact detected from 49C for 3 min.

Connector 63H open

No contact detected from 63H for 3 min.

Two or more connectors open

At least two open connector contacts detected

L2-phase or connector 51CM open

No L2-phase or no contact detected from 51CM for 3 min.

Fault on the phase fault detection circuit (control board)

No signal detected on control board

Fault with the system circuitry

No feedback signal received from the indoor unit 0.5 sec. after applying the supply
voltage

Wiring fault between indoor and outdoor unit

(cable break, loose connection)

Data transfer between indoor and outdoor unit

20

Flashes 4
times

Fb Fault on the control board in the indoor unit

Fault code display

LED 1 (green) LED 2 (red) Display

Flashes
once

Flashes
twice

U2

U7 Hot gas overheating too low

U1

UE

UL Low pressure switch 63L was triggered

Description

Hot gas temperature sensor

Internal thermostat of compressor motor 49C was triggered.
Refrigerant level

High pressure switch 63H was triggered

Flashes 3 times

Flashes 3
times

Flashes 4
times

Ud Overheating protection function

Circuit breaker on the condenser (overload)

U6

Fault in the power module

Circuit breaker on the condenser (thermal overload relay)

UA

UC Condenser switched off by internal protection function

UF Condenser blocked, overcurrent protection device was triggered

UP Overload protection device was triggered

UH Fault on the current sensor

U3 Fault on the hot gas temperature sensor TH4

Thermal overload relay is triggered
Only for models with a three-phase power supply

Fault on the line temperature sensor of the outdoor unit TH3

Flashes 5
times

Flashes 6
times

Flashes 7
times

Fault on the heat exchanger temperature sensor of the outdoor unit TH6

U4

Fault on the outdoor air temperature sensor of the outdoor unit TH7

Fault on the inverter cooling block temperature sensor TH8

U5 Temperature fault on inverter cooling block

U6 Fault in power supply

21

REMKO SYSTEM MONITOR

FOR REMKO SUPERTEC INVERTER

Fault code Meaning Cause Remedial measures

No supply voltage is present at terminal
block TB1.

The main switch connected upstream is
turned off.
Poor or detached contacts at the
terminals.
Open phase (L, L1 or N)

There is no voltage at the input of the
power supply on the voltage board.

Poor or detached contacts at the
terminals.
Open phase on the voltage board.
Connector unplugged:
CMF80/90/-CMT100: R or S
CMF140/150-CMT150:
TABT or TABS

Check main switch.
Check connection, wiring, phases and
contacts at TB1 and correct

Check connection, wiring, phases and
contacts at TB1 and correct.
Check connection, wiring, phases
and contacts at the connectors on the
voltage board and correct.

No display

and no function

No voltage is supplied to the control
board.
Poor or detached contacts on the
CNDC connector or connector
unplugged.

_

Poor or detached contacts on the DCL
or ACL transformer.

Poor or detached contacts on the
interference board or components of
the interference board defective.

Voltage board defective. Replace defective voltage board.

Check contacts on the CNDC connector
on the control board and repair.
Contacts on connectors LD1, LD2
CNDC on the voltage board
Check interference filter and repair.

Check contacts on the DCL transformer
and repair.
wwLO and LO on the interference board
R and S on the voltage board
Check contacts of L1 and L2 on the
active filter module ACTM and repair.

Check contacts on the interference board
and repair.
Replace defective interference board.

22

Control board on the outdoor unit

a) 6.3 A fuse blown.

b) Defective components

Control board on the outdoor unit
defective.

Replace 6.3 A fuse

Replace defective control board
if the above points have not
proved to be of assistance.

Replace defective control board
if the above points have not
proved to be of assistance.

Fault code Meaning Cause Remedial measures

Phases reversed, power supply,
polarity reversed on connection

F1

F2

and control cables to the indoor
unit

1. Three seconds after switching
on the power supply, a phase
fault is detected.

2. Four minutes after switching
on the power supply, reverse
polarities are detected on the
supply and control cables.

L3-phase open

If a phase fault is detected on
L3 two seconds after switching
on the power supply, fault
message "F2" is issued

Control cables to S1, S2, S3
reversed (TB4), note polarity.
Phases L1, L2, L3 reversed
(TB1), note polarity.
Cables reversed at the terminals
for supply voltage TB1 and
control cables TB4.

Open phase on L3. Check wiring and correct.

Check connection and polarity at
the terminals.
Swap phases L1 and L2 at TB1.
Check wiring and correct.

F3

F5

F7

Low pressure switch 63L

If the circuit of low pressure
switch 63L does not report a
contact for over 3 mins after
applying the supply voltage,
fault message "F3" is issued

High pressure switch 63H

If the circuit of high pressure
switch 63H reports a contact
for over 3 mins after applying
the supply voltage, fault
message "F5" is issued.

Phase fault on the control
board.

If no signal is being generated
by the phase measuring circuit
three seconds after switching
on the power supply, fault
message "F7" is issued.

Poor or detached contacts
on the 63L connector on the
control board of the outdoor
unit, or connector unplugged.
Poor or detached contacts on
63L.
63L was triggered due to a lack
of refrigerant or by defective
components.
Control board defective.

Poor or detached contacts
on the 63H connector on the
control board of the outdoor
unit, or connector unplugged.
Poor or detached contacts on
63H.
63L was triggered due to
defective components.
Control board defective.

Control board defective. Replace defective control board.

Check contacts on the 63L
connector on the control board
and repair.
Check contacts and cable on 63L
and repair.
Check refrigerant level.
Test electrical components.
Replace defective components.
Replace defective control board.

Check contacts on the 63H
connector on the control board
and repair.
Check contacts and cable on
63H and repair.
Test electrical components.
Replace defective components.
Replace defective control board.

23

REMKO SYSTEM MONITOR

FOR REMKO SUPERTEC INVERTER

Fault code Meaning Cause

Poor or detached contacts on
the connectors on the control
board of the outdoor unit, or
connectors unplugged.
Poor or detached contacts on
other components.
Components were triggered by
defective components.
Control board defective.

Poor or detached contacts on
connector 51CM on the control
board of the outdoor unit, or
connector unplugged.
Poor or detached contacts on
thermal relay 51CM.
Thermal relay 51CM was
triggered due to defective
components.
Control board defective.

Poor or detached contacts on
the connections of the control
cables, or wiring fault.
Incorrectly dimensioned control
cables.
Interference noise in the control
cables.

Poor or detached contacts on
the connections of the control
cables, or wiring fault
Incorrectly dimensioned control
cables.
Interference noise in the control
cables.
Voltage board on the outdoor
unit defective

Poor or detached contacts on
the connections of the control
cables, or wiring fault.
Incorrectly dimensioned control
cables.
Interference noise in the control
cables.

F9

FA

EA

Eb

EC

High and low pressure switches
63H, 63L

Thermal relay 51CM
If the circuits of the identified
components report a contact
for over 3 mins after applying
the supply voltage, fault
message "F9" is issued.

Thermal relay 51CM

If the circuits of the thermal
relay 51CM report a contact for
over 3 mins after applying the
supply voltage, fault message
"FA" is issued.

Control cables between indoor
and outdoor units defective,
too many indoor units
connected

A test circuit will automatically
detect the number of indoor
units connected. If the control
cables continue not to work for
longer than 4 mins after the
power supply is applied, fault
message "EA" is issued.

Wiring fault on the control
cables between the indoor
units and outdoor unit (phases
reversed, no contact)

A test circuit will automatically
set the number of indoor units
connected. If the control cables
continue not to work for longer
than 4 mins after the power
supply is applied, fault message
"Eb" is issued.

Time limit for start of operation
exceeded

The system has still not
been properly initialised over
four mins after the start of
operation. The fault message
"EC" is issued.

Remedial measures

Check contacts on the
connectors on the control board
and repair.
Check contacts and cables of the
components and repair.
Test electrical components.
Replace defective components.
Replace defective control board.

Check contacts on connector
51CM on the control board and
repair.
Check contacts and cable on
51CM and repair.
Test electrical components.
Replace defective components.
Replace defective control board.

Check contacts, cables and
connections of the control cables
on all units and repair.

Check cable section and lengths
of the control cables and correct:
max. length 50 m (indoor­outdoor) or max. 30 m (indoor­indoor)
Check polarity of control cables
S1, S2 and S3 and correct.

Switch the supply voltage off and
back on once and check if the
fault still occurs.
Replace the control boards of
the affected indoor and outdoor
units if the fault does still occur.
Check control cables.

Check control cables and rectify
the cause of the interference
noise.

These remedial measures apply
to "EA", "Eb" and "EC".

24

Fault code Meaning Cause Remedial measures

Dirt on the heat exchanger in
the indoor module.
Pump motor in the indoor unit
jammed.
Malfunction of the pump motor
in the indoor module.

U1

High pressure too high (63H
was triggered)

The high pressure switch 63H
was triggered because the high
pressure exceeded 4.14 MPa
during continuous condenser
operation.

Faulty ball shut-off valve (not
fully open).
Blocked or cracked refrigerant
line.
Fan motor on the outdoor unit
jammed.
Malfunction of the fan motor
on the outdoor unit.
Air "short-circuit" on the
outdoor unit.
Dirt on the heat exchanger of
the outdoor unit.
Reduced airflow volume due
to inaccurate temperature
measurement on the outdoor
air temperature sensor
(measurement too low).
Defective contact of connector
63H to the control board of the
outdoor unit.
Faulty connection of 63H.
Control board of the outdoor
unit defective.
Faulty LEV
Defective fan drive
Too much refrigerant in the
system

Check components and rectify
cause of the fault.
Check that all ball shut-off valves
are fully open.
Check pipework and rectify fault.
Check outdoor unit and replace/
repair defective components.
Check the temperature sensor
with the help of the system
monitor and proceed accordingly
in order to rectify the fault.
Switch supply voltage off and
back on again once. Check if
fault codes "F5" or "UH" are
displayed. If so, see "Remedial
measures" for "F5" or "UH".
Check LEV.
Replace defective control board
of the outdoor unit.
Correct refrigerant level

U2

Hot gas temperature too high

At hot gas temperature sensor
TH4, over 125°C was detected
or over 110°C for a period of 5
minutes.
In defrost mode, over 40°C
was detected at TH5 and over
110°C at hot gas temperature
sensor TH4.

Continued on the next page

Rise in temperature in the
condenser due to lack of
refrigerant.

Defective temperature sensor
TH4, TH5, TH6.

Control board of the outdoor
unit defective.

Faulty LEV.

Check inlet overheating.

Check pipework, refrigerant level
and additional fill amount.

Switch supply voltage off and
back on again once. Check
if fault code "U3" is then
displayed. If so, see "Remedial
measures" for "U3".

Check LEV.

25

REMKO SYSTEM MONITOR

FOR REMKO SUPERTEC INVERTER

Fault code Meaning Cause

Refrigerant level

Incorrect if the hot gas
overheating in cooling mode
TH4–TH5 / in heating mode
TH4–TH6 rises as follows.

U2

All conditions must be fulfilled
for a period of 10 mins (at least
6 mins after the condenser
starts up)!

The condenser is working in
heating mode.
The hot gas overheating is 70°C
or more. TH6 > TH7 – 5K
TH5 < 35°C

The condenser is working
(C/H).
In cooling mode the hot gas
overheating is 80°C or more.
In heating mode the hot gas
overheating is 90°C or more.
In cooling mode the
condensation temperature is
TH6 < –40°C

Rise in temperature in the
condenser due to lack of
refrigerant.

Defective temperature sensor
TH4, TH5, TH6.

Control board of the outdoor
unit defective.

Faulty LEV.

Remedial measures

Check inlet overheating.

Check pipework, refrigerant level
and additional fill amount.

Switch supply voltage off and
back on again once. Check
if fault code "U3" is then
displayed. If so, see "Remedial
measures" for "U3".

Check LEV.

26

U3

Open circuit/short-circuit on
the hot gas temperature sensor
TH4 or condenser temperature
sensor TH32

If no resistance (0°C = 0 Ω) or
infinite resistance (>217°C = ∞
Ω) is measured on the hot gas
temperature sensor TH4 when
the condenser is operational,
fault message "U3" is issued
(this function is not available in
the first 5 to 10 mins after the
condenser begins operation,
after the conclusion of defrost
mode or while defrost mode is
operational.)

Poor or detached contacts of
the cables and connectors on
the control board.
Temperature sensor defective.
Control board of the outdoor
unit defective.

Check connectors and contacts
of the temperature sensor on the
control board and repair.
Check connection cables of the
temperature sensor for cable
break or similar.

Check the temperature sensor
with the help of the system
monitor and proceed accordingly
in order to rectify the fault.

Replace defective control board
of the outdoor unit.

Fault code Meaning Cause

Open circuit/short-circuit on
the temperature sensors of
the outdoor unit (TH3, TH32,
TH33, TH6, TH7 and TH8).

If no resistance (0 Ω) or infinite
resistance (∞ Ω) is measured
by one of the temperature
sensors when the condenser
is operational, fault message

U4

Name Description Open(XX),at Short-circuit (0X), at

TH3, TH32, TH33 Cable temperature sensor -40°C and lower 90°C and higher

TH6 Two-phase mixture -40°C and lower 90°C and higher

TH7 Outdoor air -40°C and lower 90°C and higher

TH8 Inverter cooling block -27°C and lower 102°C and higher

"U4" is issued.
With the help of the system
monitor on the outdoor
unit, you can detect which
temperature sensor is affected
(this function is not available
in the first 10 mins after the
condenser begins operation,
after the conclusion of defrost
mode or while defrost mode is
operational.)

Poor or detached contacts of
the cables and connectors of
one or more of the temperature
sensors on the control board.
Temperature sensor defective.
Control board of the outdoor
unit defective.

Remedial measures

Check connectors and contacts
of the temperature sensors on
the control board and repair.
Check connection cables of the
temperature sensors for cable
break or similar.

Check the temperature sensor
with the help of the system
monitor and proceed accordingly
in order to rectify the fault.

Replace defective control board
of the outdoor unit

U5

Temperature fault on inverter
cooling block

If the temperature at TH8
on the inverter cooling block
reaches or exceeds the value
specified below, fault message
"U5" is issued.

CMF80/90: 77°C

CMT100: 77°C

CMF140/150: 95°C

CMT150: 95°C

Fan motor jammed.
Fault on the fan motor.
Air inlets and outlets dirty/
blocked.
Increase in outside air
temperature.
Temperature sensor defective.
Input circuits (supply voltage)
on the voltage board of the
outdoor unit defective.
Drive circuit of the outdoor unit
fan defective.

Check fan motor. Check air inlets
and outlets and clean.
Check whether other weather­related causes are responsible for
the rise in temperature.
Upper temperature limit 46°C.

Switch the supply voltage off
and back on. Check if fault "U5"
is issued again within the next
half hour.
If "U4" is issued, rather
than "U5", you can find the
descriptions under "U4".
Measure the resistance of the
temperature sensor TH8 or use
the system monitor to query the
temperature at TH8. Replace
defective temperature sensor.
Replace defective voltage board
on the outdoor unit.

27

REMKO SYSTEM MONITOR

FOR REMKO SUPERTEC INVERTER

Fault code Meaning Cause Remedial measures

U6

U7

Power modules in the inverter
circuit defective.

If overcurrent is detected in the
inverter circuit ("UF" or "UP"
is displayed), the inverter circuit
is defective and fault message
"U6" is issued.

Overheating interrupted by too
low hot gas temperature

If the overheating is around -15
K for over 3 mins, the LEV is
almost closed (lowest impulse
rate) and 10 mins have passed
since the condenser was started
up, fault message "U7" is
issued.

Faulty ball shut-off valve (not
fully open).
Increase in supply voltage.
Poor or detached contacts of
the connection cables to the
condenser or reversed phases.
Condenser defective. Voltage
board defective.

Poor or detached contacts of
the cables and connectors of
the hot gas temperature sensor
TH4 on the control board. Hot
gas temperature sensor TH4
not properly secured.
Poor or detached contacts of
the cables and connectors on
the LEV drive.
Poor or detached contacts of
the LEV cables on the control
board.
LEV defective.

Check and fully open all ball
shut-off valves.
Check supply voltage (mains).
Check condenser wiring and
correct (phases U, V, W).
Check condenser, replace
condenser if defective
Replace defective voltage board
on the outdoor unit.

Check contacts, cables and
connections of the temperature
sensor TH4 and repair.
Secure temperature sensor TH4
properly.
Check contacts, cables and
connections of the LEV drive and
repair.
Check LEV and replace.

28

U8

Speed fault on the fan motor.

The speed of the fan motor is
determined to be faulty if:
at an outdoor temperature
above 20 °C for a duration of
15 s, a maximum of only 100
rpm is measured.
for a duration of one minute,
less than 50 rpm or over 1500
rpm is measured.

Fan motor defective.

Control board defective.

Check fan motor and replace
defective motor.

Check control board and replace
defective circuit board

Fault code Meaning Cause Remedial measures

Rise in the supply voltage
(mains).

U9

Overvoltage or undervoltage
in the inverter and fault in the
serial communication of the
circuit boards.

Drop of the bus voltage below
310 V

Sudden drop of the bus voltage
below 200 V (CMF80/90
CMT100)
below 350 V (CMF140/150
CMT150)

Rise of bus voltage above 420
V ( CMF80/90 CMT140)
above 760 V ( CMF140/150
CMT 150)

Drop in the power consumption
of the outdoor unit to just 0.5
A with an operating frequency
of 40 H� or condenser current
of 5.0 A.

Wiring detached from the
condenser.
Contactor 52C defective.
Connector CN52C detached or
unplugged.
PFC module on the voltage
board of the outdoor unit
(CMF80/90CMT100) defective
ACT module defective.
ACT circuit defective.
Connector CNAF detached or
unplugged.
Converter circuit on outdoor
unit (CMF140/150CMT150)
defective
52C circuit on the control board
(CMF80/90CMT100) defective
Connector CN5 on the voltage
board detached or unplugged
52C circuit on the voltage
board (CMF140/150CMT150)
defective
Connector CN5 on the voltage
board detached or unplugged

Check supply voltage at the
mains.
Check wiring to the condenser
and voltage board and correct.
Replace defective 52C.
Check fit and wiring of CN52C
and correct.
Replace control board.
Replace ACT module.
Replace voltage board.
Check fit and wiring of CNAF
and correct.
Replace converter board.
Replace control board.
Check fit and wiring of CN5 and
correct.
Replace voltage board.
Check fit and wiring of CN2 and
correct.

UA

Ud

Thermal relay 51C was
triggered.

If thermal relay 51C is
triggered, fault message "UA"
is issued.

Overheating protection
(overload protection, fan motor
fault)

If the line temperature (TH3)
exceeds 70°C, fault message
"Ud" is issued.

Shut-off valves closed during
operation.
Fault on the condenser.
Variations in the supply voltage
(mains).
Brief interruption to the supply
voltage (mains).

In cooling mode: fan motor
defective, air "short-circuit".
Temperature sensor TH3
defective.
Control board defective.

Shut-off valve fully open.
Check condenser and if
necessary replace.
Check supply voltage (mains).

Check fan motor, replace if
defective.
Switch supply voltage off and
back on to check if "U4" will be
displayed when the system starts
back up. If "U4" is displayed, see
"U4".
Check temperature sensor,
replace if defective.
Check control board, replace if
defective.

29

REMKO SYSTEM MONITOR

FOR REMKO SUPERTEC INVERTER

Fault code Meaning Cause Remedial measures

UE

UF

High pressure fault, 63H was
triggered

The high pressure protective
switch detected 4.14 MPa
in heating mode for the first
time within the first 20 s
after condenser startup, and
switched the condenser off.
Fault message "UE" is issued.

Protective device to protect
against overcurrent on the
condenser: condenser blocked

If the operating current of the
condenser exceeds 1.2 times
the permissible value, fault
message "UF" is issued.
If overcurrent is detected on the
DC bus or in the condenser 30
s after condenser startup, fault
message "UF" is issued.

Shut-off valves closed during
operation.
Connector 63H detached or
unplugged.
Control board defective.
Power supply was switched
back on, air filters on indoor
unit are dirty, overload
operation.
Control board defective
LEV defective

Shut-off valves closed.
Rise in the supply voltage
(mains).
Connector detached or
unplugged, cable break, phases
reversed.
Condenser defective.
Voltage board defective
Phase fault on the condenser

Shut-off valve fully open.
Switch supply voltage off and
back on to check if "F5" will
be displayed when the system
starts back up. If "F5" is
displayed, see "F5".
Replace defective control
board.
Check LEV.

Open shut-off valves.
Check supply voltage at the
mains.
Check wiring and phases (U,
V, W) on the condenser and
voltage board, correct and
replace defective components.
Check condenser, replace
defective condenser.
Replace voltage board.
Check wiring on the condenser
and correct.

30

UH

Fault on the current sensor.

If a current between -1.5 A
and +1.5 A is detected on
the current sensor while the
condenser is running, fault
message "UH" is issued. This
fault is ignored during test runs.

Poor or detached contacts of
the connection cables to the
condenser or reversed phases.

Circuit (current sensor) on the
voltage board of the outdoor
unit defective.

Check condenser wiring and
correct (phases U, V, W).

Replace defective voltage board
on the outdoor unit.

Fault code Meaning Cause

Low pressure fault (63L was
triggered).

If one of the two following
conditions are met in heating
mode for a duration of 3 mins
within the first 10 mins after
condenser startup, fault message
"UL" is issued
(this fault is

UL

ignored if the total operating time
of the condenser since it was
started has reached or exceeded a
sum of 30 mins.)
TH7 – TH3 ≤ 4 K
TH5 – room temp. ≤ 2K
Meaning the following:
TH3: liquid line temperature in the
outdoor unit in °C.
TH5: vaporiser/condenser
temperature in the indoor unit in
°C.
TH7: Outdoor air temperature in
°C

Shut-off valves closed.

Lack of refrigerant or leakage.

LEV defective.

Remedial measures

Open shut-off valves

Check refrigerant level
and additional fill amount.
Check pipe system for leaks
and rectify.

Check LEV.

Ball shut-off valve closed during
operation.

Rise in the supply voltage (mains).

Poor or detached
contacts of the connection cables

Overcurrent in the condenser –
protective device was triggered.

UP

* Before replacing the condenser, check that the voltage and frequency applied between phases U-V, V-W and W-U is the
same.

To do so, disconnect the condenser and start the test run. Measure the voltage. If the same voltage and frequency is applied
between the phases, the condenser is defective and must be replaced.

If, 30 seconds after condenser
startup, the protective device
has been triggered due to DC
overcurrent, fault message "UP"
is issued.

to the condenser or reversed
phases.

Blower or fan defective.

Air "short circuit" on outdoor unit.

Input circuit (voltage) on the
control board of the outdoor
module defective.

Condenser defective.

Inverter board defective.

Incorrect DIP switch settings on the
control board of the outdoor unit.

Check and fully open all ball
shut-off valves.

Check supply voltage
(mains).

Check condenser wiring and
correct (phases U, V, W).

Check blower and/or fan.

Rectify air "short-circuit".

Replace defective circuit
boards.

Check condenser and
replace if defective.*

Replace defective circuit
boards.

Check DIP switch and
correct settings.

31

REMKO INTERNATIONAL

...and right in your own location too!
Benefit from our experience and advice

REMKO GmbH & Co. KG
Air conditioning and heating technology

Consultation

Thanks to intensive training, our

consultants are always com-

pletely up-to-date in terms of

technical knowledge. This has

given us the reputation of being

more than just an excellent, reli-

able supplier.

REMKO is a partner

that helps you find solutions to

your problems.

Sales

REMKO offers not just a well

established sales network both

nationally and internationally, but

also has exceptionally highly-

qualified sales specialists.

REMKO field staff are more than

just sales representatives; above

all, they must act as advisers to

our customers in air conditioning

and heating technology.

SFlbCustomer Service

Our units operate precisely and

reliably. However, in the event of

a fault, REMKO customer service

is quickly at the scene. Our com-

prehensive network of experi-

enced dealers always guarantees

quick and

reliable service.

Im Seelenkamp 12 D-32791 Lage
Postfach 1827 D-32777 Lage
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Website www.remko.de

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