Fault code ECOi ME2 & MF2

Error code E03: The remote control does not recognise a communication signal from the remote control

Possible causes:

• No remote control connected to the indoor unit.
• Remote control defective.
• Remote control connection to the indoor unit is faulty.

Error code E01: The remote control detects an error signal from the indoor unit

Possible causes:
The address of the indoor unit was incorrectly controlled by the unwanted remote control of the indoor unit.
Error receiving the serial communication signal. (Signal from the main indoor unit with group control)
Example: The automatic address is not complete.

Error code E02: The remote control detects an error signal from the indoor unit

Possible causes:
Serial communication signal transmission error

Error code E06: Outdoor unit receives errors from indoor unit

Alarm conditions:
Outdoor unit could not receive serial communication signals from indoor unit

Possible cause:
The power supply to the indoor unit was turned off after the first communication
An interruption or short circuit occurred in the control line between the units after the initial communication was completed

Location:
Check the power supply on the indoor and outdoor units and the control lines between the units

Notes:
This alarm is recognised after the initial communication is completed. For this reason, it does not occur if the serial port is not connected, the terminal unit is not set, or other problems have occurred before the initial communication is completed. If the initial communication has not been completed, alarm E04 occurs

Error code E12: Do not allow automatic address setting to start

Alarm conditions:
The automatic address setting started when the automatic address setting was performed on another outdoor unit in the same connection

Possible cause:
The automatic address setting is carried out on another outdoor unit

Location:
This alarm is not shown on the remote control. Therefore, check the blinking on the outdoor unit circuit board.

Correction
Wait for the automatic address setting on the outdoor unit, on which it is being performed, to finish. Then restart the automatic address setting

Error code E15: Automatic address setting alarm (too few units)

Possible causes:
The number of indoor units set with the indoor unit quantity setting SW (SW3, SW4) on the circuit board of the outdoor unit is too high
The control lines between the indoor units have been disconnected.

Location:
Refer to the maintenance material for the test run and check the quantity setting of the indoor unit SW (SW3, SW4).
Check the control lines between the units on the indoor and outdoor units

Correction:
Perform the automatic address setting again after correcting the quantity setting of the indoor unit or the wiring between the units

Notes:
3WAY switch position

Error code E30: Error when transmitting to the outdoor units
 

Possible causes:
During the automatic address setting, the number of connected devices does not correspond to the set number.
If you switch on the power supply, the number of connected devices does not correspond to the set number.
Outdoor unit serial transmission error

Error code E31: Wiring error between the circuit boards

Possible cause: When does it happen?

• An error occurred while rewriting the microcomputer
• If the device is switched off while rewriting the microcomputer
• Without wiring between the board and the ROM burner

Location:
Rewrite the micro-computer
Turn the unit on again

Correction:

Replace control board

Error code F04: Error in the compressor 1 outlet temperature
 

Alarm conditions:
Discharge temp. of 100°C or higher was found 30 minutes or more after the compressor stopped
Discharge temp. of 80°C or higher was found after all compressors were stopped for 60 minutes or longer
A / D step is 10 steps or less (short circuit)

Possible cause:

1. Malfunction of the sensor

• Malfunction of the sensor element
• The sensor wiring is partially disconnected, which leads to increased electrical resistance
• This alarm does not occur if the wiring is interrupted or the plug is not connected to the circuit board of the outdoor unit

2. Wiring crossed or installation failure

• The outlet temperature sensor of this compressor is connected to the outlet pipe of the other compressor
• The connector for the outlet temperature sensor of the problem compressor is connected to the PCB connector of the outdoor unit for the other compressor

3. Circuit board fault in the outdoor unit

4. The check valve on the outlet pipe for this compressor is wet

5. An air short circuit blockage in the area of the outdoor unit raised the ambient temperature of the outdoor unit and reduced the cooling effects after the compressor stopped

6. There is a cause that leads to a P03, P17 or P02 alarm

7. Electrical noise

Location:

1. Malfunction of the sensor and failure of the outdoor unit circuit board

• Constantly shows a high temperature
• If monitoring software or other means of monitoring are used, the discharge temperature can fluctuate suddenly and wildly in some cases
• In some cases the exact temperature may not be known, even if surveillance software is used

Error code F04: Error in the compressor 2 outlet temperature
 

Alarm conditions:
Discharge temp. of 100°C or higher was found 30 minutes or more after the compressor stopped
Discharge temp. of 80°C or higher was found after all compressors were stopped for 60 minutes or longer
A / D step is 10 steps or less (short circuit)

Possible cause:

1. Malfunction of the sensor

• Malfunction of the sensor element
• The sensor wiring is partially disconnected, which leads to increased electrical resistance
• This alarm does not occur if the wiring is interrupted or the plug is not connected to the circuit board of the outdoor unit

2. Wiring crossed or installation failure

• The outlet temperature sensor of this compressor is connected to the outlet pipe of the other compressor
• The connector for the outlet temperature sensor of the problem compressor is connected to the PCB connector of the outdoor unit for the other compressor

3. Circuit board fault in the outdoor unit

4. The check valve on the outlet pipe for this compressor is wet

5. An air short circuit blockage in the area of the outdoor unit raised the ambient temperature of the outdoor unit and reduced the cooling effects after the compressor stopped

6. There is a cause that leads to a P03, P17 or P02 alarm

7. Electrical noise

Location:

1. Malfunction of the sensor and failure of the outdoor unit circuit board

• Constantly shows a high temperature
• If monitoring software or other means of monitoring are used, the discharge temperature can fluctuate suddenly and wildly in some cases
• In some cases the exact temperature may not be known, even if surveillance software is used

Error code F06: Outdoor unit heat exchanger 1 gas (inlet) temperature sensor faulty

Alarm conditions:

Error code F12: Compressor inlet temperature sensor faulty
 

Error code F14:  Overcooling gas temperature sensor faulty
 

Alarm conditions:
A / D step is 10 steps or less (short circuit)
A / D step is 1014 steps or more (open circuit)

Error code F16: High pressure sensor faulty, high load

Alarm conditions:
High pressure sensor not connected or open circuit    
The high pressure sensor continuously measured over 3.6 MPa for 30 minutes while the outdoor units stopped
High pressure sensor detected over 3.6 MPa while outdoor units were operating

Error code F17: Low pressure sensor faulty

Alarm conditions:
Sensor short circuit
Open sensor circuit

Possible cause:
Sensor malfunction (including connector)
PCB fault

Location:
Measure sensor resistance. Check whether the sensor is functioning normally
Use a remote control or PC monitor to check the temperature detected by the microcomputer

Error code F23: Outdoor unit heat exchanger 2 gas (inlet) temperature sensor faulty

Alarm conditions:

Error code F24: Outdoor unit heat exchanger 2 liquid temperature sensor (outlet) faulty

Alarm conditions:
A / D step is 10 steps or less (short circuit)
A / D step is 1014 steps or more (open circuit)

Error code F31: Error in the outdoor unit solid-state memory (EEPROM)

Alarm conditions:
There is no solid-state memory available for power initialisation
The read values do not match after writing to the solid-state memory is complete

Possible cause:
Memory was not inserted after the circuit board was replaced
The service life of the solid-state memory has been reached
The solid-state memory is installed incorrectly (wrong direction, bent pin, etc)

Location:
Check the solid-state memory on the circuit board

Error code H01: Compressor 1 current values not in the control range (overcurrent)

Error code H03: CT sensor for compressor 1 not connected, short circuit

Alarm conditions:
Compressor 1: When compressor 1 (INV) is stopped, the primary current is sensed above 18A. * If the frequency of compressor 1 (INV) is above 35 Hz and the secondary current is above 7.0 A, a primary current of less than 0.7 A is detected
* No current is recognised even though the compressors are operating

Possible cause:
Transformer circuit failure (including cable break etc.)
Transformer circuit plug removed
Phase missing to which the current transformer circuit is connected
This transformer circuit is connected to the connection of the other transformer circuit
PCB error
Electrical noise

Error code H05: Compressor 1 outlet temperature sensor not connected
 

Error code H06: Low pressure uncontrolled pressure drop

Alarm conditions:
The low pressure sensor continuously detects less than 0.06 MPa for 2 minutes or less than 0.02 MPa for a moment

Possible cause:
Defective low pressure sensor
Error when the service valve in the outdoor unit opened
Blocked refrigerant circuit
Lack of refrigerant gas
Refrigerant accumulates in the stopped outdoor units

Location:

1. Low pressure sensor defective

Check the sensor resistance value (use a tester and measure the resistance between sensor No1 and No3)

• A resistance of less than 95 kΩ indicates a short circuit or other problems
• A resistance of 95 kΩ - 105 kΩ (low pressure sensor pin 1-3) is normal
• A resistance of more than 105 kΩ indicates an interruption or other fault

Connect a pressure gauge to the low pressure outlet and check whether the value displayed by the monitoring software has changed and whether the pressure gauge pressure deviates significantly

2. The outdoor unit service valve can not be opened
Check the open/closed condition of the maintenance valve

3. Check the refrigerant circuit for blockages
If the refrigerant circuit is blocked, the refrigerant will not return to the compressor. As a result, the vacuum may occasionally decrease abnormally. Then check the following points: Solenoid valve, expansion valve, stains caused by dirty water in the circuit, etc

4. Lack of refrigerant gas
If there is a lack of refrigerant charge or amount in the system caused by gas leakage, the low pressure may occasionally decrease abnormally

5. Refrigerant is accumulated in the stop mode of the outdoor units
Leakage of expansion valve and solenoid valve in the outdoor unit in stop mode, etc

Correction:

1. Replace the low pressure sensor
If you replace a low pressure sensor, perform the refrigerant recovery on the outdoor unit

2. Rectify the refrigerant circuit fault

Open the outdoor unit valve
Clear blockage
Resolve insufficient refrigerant gas (correction of gas leakage, additional refrigerant, etc.)
If you top up due to lack of refrigerant, gradually add 500 g of refrigerant each time

Notes:

Example:

    The alarm had occurred due to a lack of refrigerant due to a gas leak
    The alarm occurred when the fluid, suction and pressure pipes were blocked

Error code H08: Fault (open circuit) on the oil sensor (connection) on the compressor 1

Alarm conditions:
This alarm occurs when a connection (pins 1 and 2 for compressor 1, pin 4 and 5 for compressor 2) is open.

Possible cause:
Plug removed

Location:
Check whether the connector is firmly connected

Correction:
Connect the plug
Correct the connection on pins 4 and 5

Error code H11: Compressor 2 current values incorrect (overcurrent)
 

Location:

1. Compressor failure (partially locked)
Problem: The actual value during operation considerably exceeds the value given above.
Test: If the current for each phase is measured with a clamp meter or similar instrument, check that the current value for all phases is not high. If MG has been switched on (caution), make sure that no compressor noises occur or that the compressor does not run with a groaning noise.

2. CT circuit failure, PCB failure

• Check for bad connector contact
• Check continuity of the transformer circuit
• Install a normal transformer instead of this transformer and check it. If current is detected, the board can be repaired → CT circuit failure
• Check whether current flows in the phase to which the transformer circuit is connected -> Check the voltage and the current

3. Missing power phase
Problem: This alarm mainly occurs when the T phase is missing. If the R phase or S phase is missing, transformer or PCB continuity problems arise. However, this may not apply in the event of a missing phase caused by a magnetic SW error.
Check: There is a possibility of a magnetic SW error. Therefore, check the phase voltage in a location as close as possible to the compressor.

4. Low voltage
Problem: In most cases, this occurs when another constant speed compressor (including compressors in other units) or another unit is started. This also occurs when the power cables are extremely long.
Test: Check the voltage between the individual phases. However, if this occurs when starting other units or compressors, an oscilloscope is required.

5. PCB error

Test: Make sure that the current value measured with the clamp meter is not below the value measured with the PC or the remote control

6. If after checking the above items the cause is still unknown, it is possible that noise is the cause of the problem. It is necessary to connect a PC or other instrument

Correction:

• Replace the compressor
• Replace the transformer circuit
• Repair the circuit
• Adjust the primary side power. Repair the power cables
• Replace the outdoor unit circuit board
• Rectify the fault

 In the event of a compressor failure, measures may need to be taken to remedy the cause of the compressor failure (e.g., fluid blockage) to prevent a new occurrence. Make sure that there is no cause for the compressor blocking

Error code H13: CT sensor for compressor 2 not connected, short circuit

Error code H15: Compressor 2 outlet temperature sensor not connected

 

Error code H21: Compressor 2 HIC Alarm
 

Location:

1. Compressor failure (partially locked)
Problem: The actual value during operation considerably exceeds the value given above.
Test: If the current for each phase is measured with a clamp meter or similar instrument, check that the current value for all phases is not high. If MG has been switched on (caution), make sure that no compressor noises occur or that the compressor does not run with a groaning noise.

2. CT circuit failure, PCB failure

• Check for bad connector contact
• Check continuity of the transformer circuit
• Install a normal transformer instead of this transformer and check it. If current is detected, the board can be repaired → CT circuit failure
• Check whether current flows in the phase to which the transformer circuit is connected -> Check the voltage and the current

3. Missing power phase
Problem: This alarm mainly occurs when the T phase is missing. If the R phase or S phase is missing, transformer or PCB continuity problems arise. However, this may not apply in the event of a missing phase caused by a magnetic SW error.
Check: There is a possibility of a magnetic SW error. Therefore, check the phase voltage in a location as close as possible to the compressor.

4. Low voltage
Problem: In most cases, this occurs when another constant speed compressor (including compressors in other units) or another unit is started. This also occurs when the power cables are extremely long.
Test: Check the voltage between the individual phases. However, if this occurs when starting other units or compressors, an oscilloscope is required.

5. PCB error

Test: Make sure that the current value measured with the clamp meter is not below the value measured with the PC or the remote control

6. If after checking the above items the cause is still unknown, it is possible that noise is the cause of the problem. It is necessary to connect a PC or other instrument

Correction:

• Replace the compressor
• Replace the transformer circuit
• Repair the circuit
• Adjust the primary side power. Repair the power cables
• Replace the outdoor unit board
• Rectify the fault

In the event of a compressor failure, measures may need to be taken to remedy the cause of the compressor failure (e.g., fluid blockage) to prevent a new occurrence. Make sure that there is no cause for the compressor blocking

Error code H27: Compressor 2 Oil detection sensor (connection) defective

Alarm conditions:
This alarm occurs when a connection (pins 4 and 5 for compressor 2) is open.

Possible cause:
Plug removed

Location:
Check whether the connector is firmly connected

Correction:
Connect the plug
Correct the connection on pins 4 and 5

Error code H31: Compressor 1 HIC Alarm

Alarm conditions:
This alarm occurs when the microcomputer detects an error signal (indicating an abnormal HIC temperature or other problems) from the HIC.
The HIC assesses the current and the temperature and outputs the error signal. In general, this indicates problems with the HIC itself.

Possible causes:
Overcurrent in the HIC circuit and the resulting abnormal warming caused by a HIC error

Location:
Check the power and connector wiring. If the wiring and connections are normal, use a tester to measure the resistance between the HIC performance of the compressor (HIC +) and ground (HIC–). In the event of a short circuit, there is a HIC malfunction.

Check the figure below

Correction:

If a HIC error is found, replace the board

Notes:

Switch off the power supply and check the continuity of HIC + and HIC– on the HIC board

Error code L04: The address settings of the outdoor unit have been duplicated

Error code L05: Priority of indoor unit duplicated (For indoor priority)
 

Alarm conditions:
Remote control without priority setting

Possible causes:
There are 2 or more indoor unit controls that take precedence over the operating mode in the refrigerant circuit.

Error code L05: Indoor unit double prioritised (not for prioritised indoor) and outdoor unit

Alarm conditions:
Remote control with priority set

Possible causes:
There are 2 or more indoor unit controls that take precedence over the operating mode in the refrigerant circuit.

Error code L10: The capacity of the outdoor unit was not set

Alarm conditions:
The capacity of the outdoor unit has not been set or the setting is not allowed by the system

Location:
Connect the remote control for maintenance of the outdoor unit. On the outdoor unit detailed EEPROM setting mode screen, check the outdoor unit capacity value (item code 81). Make sure it is not set to "0" or a capacity that is not allowed.

Correction:
If article code 81 is incorrect, use the remote control to maintain the outdoor unit and set it properly.
After changing the setting, make sure that you reset both the indoor and outdoor voltage

Notes:
The remote controller for maintenance of the outdoor unit is required to set the refrigerant type in the EEPROM of the outdoor unit.

Error code L17: Outdoor unit model not matching

Alarm conditions:
This alarm occurs when a unit other than a R410A refrigerant unit is connected

Possible cause :
A refrigerant unit R407C or a model R22 unit was accidentally connected
The connected unit is correct, but the refrigerant type setting in the outdoor unit's EEPROM (item code 80) is incorrect.

Location:

Check the type of refrigerant on the connected unit
Use the remote control to maintain the outdoor unit and check the refrigerant with article number 80. If the setting is incorrect, change it in R410A

Notes:
The remote control for maintenance of the outdoor unit is required to set the refrigerant type in the EEPROM of the outdoor unit.

Error code L18: 4-way valve spool separated, line separated

Alarm conditions:
During heating mode (comp. ON), the highest detected temperature on a heat exchanger of the outdoor unit (EXG 1, EXG 2, EXL 1 or EXL 2) was 20°C or more above the outside air temperature (air temp.) continuously for 5 minutes or longer or the recorded intake temperature (SCT) was 20°C or more above the outside air temperature continuously for 5 minutes or longer.

Error code P03: Error in the compressor 1 outlet temperature

Error code P04: Operation of the high pressure switch

Error code P05: Open phase detection for compressor 1

Alarm conditions:

This alarm occurs when a phase reversal or a missing phase is detected in phases L1-L2-L3-N

Possible cause:

Reversed phase or missing phase in phases L1-L2-L3-N

Location:

Check the cabling on the power terminal plate

Correction:

Swap the phases and reinsert them. Check if the result is in order

Error code P11: Cooling water frozen (chiller)

Error code P14: Activation of the O₂sensor

Alarm conditions:
An error is evaluated if the outdoor unit receives the "O2 Alarm Generated" signal from the indoor unit
If the EEPROM setting of the indoor unit (item code 0B) is set to 0001, the EXCT input short-circuited

Error code P15: Compressor 2 open phase detection

Error code P16: Compressor 1 secondary overcurrent
 

Alarm conditions:

This alarm occurs when a current fault or current detection fault occurs (when a fault judgment current is detected in the primary or secondary current or when an instantaneous secondary current of 18 A * or higher is detected).

* Changed, to output errors from current regardless of the frequency of the inverter. There are also 6 HP and 10 HP compressors

1. If more than the overcurrent values in the primary and secondary current specified in the table have been determined.

6TE compressors:

    Primary 18A
    Secondary stage 18A

10HP compressors:

    Primary 21A
    Secondary 21A

2. If more than the current values specified in the table are immediately detected in the secondary current.

6 HP compressors: Secondary 28A

10 HP compressors: Secondary 36A

See image below

Possible causes

There is a strong possibility of a compressor failure.
An alarm for current detection problems occurs when it is determined that no current is flowing after the start (DCCT is damaged). In this case, the cause is a DCCT error.

Location:

Check the power and connector wiring.

Correction

It is possible to solve this problem by limiting the maximum frequency.

Error code P17: Error in the compressor 2 outlet temperature

 

Alarm conditions:
The temperature is 106°C or more and there was a stop before triggering.
The alarm occurs when the stop occurs more than once before triggering. However, the flow counter is cleared if the compressor runs continuously for a certain period of time.

Possible causes

• Blockage of the liquid valve capillaries
• Insufficient amount of refrigerant (including problems due to insufficient initial charge and gas leakage)
• Blocking of low-pressure parts through the penetration of foreign bodies (moisture, scale, etc.)
• Crossing (hose or circuit board connector) with the other compressor thermistor
• Malfunction of the expansion valve
• Accumulation of refrigerant on stopped outdoor units
• Sensor for compressor discharge defective
• PCB- Error (A / D conversion error)
• Electrical noise

Location:

1. Capillary blockage
Problem: The compressor outlet temperature does not drop even if the fluid valve is switched on.
Control: If the fluid valve is in operation and the fluid valve is switched on, check whether the secondary side of the fluid capillaries is cold.
2. Too little refrigerant
Problem: The fluid effect is bad
Test: Check whether or not the superheat temperature drops when the mechanical valve of the evaporator is opened to 300 pulses or more (after checking for foreign matter).
3. Contamination by foreign bodies
Problem: The effectiveness of the fluid valve is poor
Control: Make sure that there is no difference in condensation or frost conditions between the primary and secondary tubes of the strainer.
4. Crossed thermistor
Problem: The outlet temperature of the other compressor is high, although only this compressor is in operation
When the fluid valve turns on, the outlet temperature of the other compressor drops.
5. Accumulation of refrigerant in stopped outdoor units

Problem:

Error code P19: Compressor 2 start error (compressor block, wiring phase open, DCCT error)

Error code P20: High load (valve forgot to open)

Alarm conditions:
The high pressure rise is not quick, but the alarm occurs if the power does not reach the expected time

Error code P22: Problems with the ventilator motor

Alarm conditions:
Fan motor start error, fan motor Hall IC input error

Possible cause:
Possible causes include a Hall IC input circuit fault and a fan HIC fault

Location:
Check the fan motor wiring, Hall IC wiring, and connector connections.
If the wiring and connections are OK, check that the Hall IC input circuit capacitor is firmly soldered to the control board of the outdoor unit. Also use a tester and measure the resistance between fan HIC power (HIC +) and ground (HIC–).
In the event of a short circuit, there is a HIC fault

see figure below

Correction:
If the fan does not start, the following corrections may be effective

• If there is a fan HIC error or a circuit error, replace the board
• If the fan motor is blocked, replace the fan motor.

Notes:

Switch off the power supply and check the continuity of "+" and "-" on the fan circuit board.

Error code P29: Compressor 1 start error (compressor block, wiring phase open, DCCT error)

Location:
Check the power and connector wiring.

Correction:
DCCT error (replace circuit board) or compressor error

Notes:
Use a tester to measure the voltage between the DCCT output on the back of the PCB and the earth. If the voltage is not within 2 - 3 V, the DCCT is malfunctioning.

Fehlercode H20: Fehlfunktion der Wasserpumpe

Alarmbedingungen:

Wenn dieser Alarm 5 Sekunden angezeigt wird.

Mögliche Ursache :

1. Betriebsstopp aufgrund eines Kurzschlusses in der Motorwicklung der Wasserpumpe.
2. Betriebsstopp aufgrund eines Drahtbruchs im Wasserpumpenmotor.
3. Betriebsstopp aufgrund eines Bruchs der Wasserpumpenkabel.
4. Betriebsstopp aufgrund einer Störung des Wasserpumpenmotors 1PM.
5. Betriebsfehler aufgrund einer fehlerhaften Leiterplatte des Innengeräts.

Korrektur:

• Ersetzen Sie die Wasserpumpe
• Ersetzen Sie die Innengerätplatine

How do you recognise the alarm display of LEDs 1 and 2 on the outdoor unit control board

LED 1 shows the TYPE of the alarm:
2 flashes = Alarm P
3 flashes = Alarm H
4 flashes = Alarm E
5 flashes = Alarm F
6 flashes = alarm L

LED 2 shows the number of the alarm:
1 = 1
2 = 2
3 = 3

As an example: If the LED 1 flashes 2 times and the LED 2 17 times, the alarm indicates error P17
This is repeated continuously.