Friedrich air conditioner error codes + troubleshooting

Table of Contents

When friedrichair conditioner status is abnormal, temperature indicator on indoor unit will blink to display corresponding error code. Please refer to below list for identification of error code.

Friedrich ac error code e1

During cooling and drying operation, except indoor fan operates, all loads stop operation. During heating operation, the complete unit stops

Possible reasons:

  1. Refrigerant was superabundant
  2. Poor heat exchange ( including filth blockage of heat exchanger and bad radiating environment ); Anbient temperate is too high.

Friedrich ac error code e2

During cooling an drying operation, compressor and outdoor fan stop while indoor fan operates

Possible reasons:

  1. Poor air return in indoor unit.
  2. Fan speed is abnormal.
  3. Evaporator is dirty.

Friedrich ac error code e4

During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating operation, all loads stop.

Friedrich ac error code e5

Supply voltage was unstable during operation. Please restart, if restart doesn’t work, contact dealer or qualified aircon technician.

Possible reasons:

  1. Supply voltage is unsable.
  2. Supply voltage is too low and load is too high.
  3. Evaporator is dirty

Friedrich ac error code e6

During cooling operation, compressor stops while indoor fan motor operates. During heating operation, the complete unit stops. The operation indicator will off 3 seconds and blink 6 times.

Friedrich ac error code e8

The operation indicator off 3 seconds and blink 8 times. This is the sign of high temperature resistant protection.

Friedrich ac error code u8

The operation indicator will off 3 seconds and blink 17 times. Circuit PG motor ( indoor fan ) has circuit malfunction by zero cross detection. Operation of remote controller or control panel is available but the unit won’t act.

Possible reason:

  1. Control board is damaged.

Friedrich ac error code h1

The heating indicator will off 3 seconds and blink once. Defrosting will occur in heating mode. The compressor will operate while indoor fan will stop operation. This is normal.

Friedrich ac error code h4

System noticed abnormal temperature range. Please restart, if restart doesn’t work, contact dealer or qualified service.

Friedrich ac error code h6

The operation indicator will off 3 seconds and blink 11 times. The complete unit will stop operation. PG motor ( indoor fan motor ) does not operate.

Possible reasons:

  1. Poor connection for PGF in circuit diagram.
  2. Malfunction of indoor units control panel AP1.
  3. Malfunction of indoor units motor M1.

Friedrich ac error code h6 troubleshooting:

Friedrich ac error code h6 troubleshooting

Friedrich ac error code c5

The operation indicator will off 3 seconds and blink 15 times. This is the sign of malfunction protection of jumper cap. The complete unit will stop operation.

Possible reasons:

  1. There is no jumper cap on the controller.
  2. Jumper cap is not inserted properly and tightly.
  3. Jumper cap is damaged.
  4. Controller is damaged.

Friedrich ac error code c5 troubleshooting:

Friedrich ac error code c5 troubleshooting

Friedrich ac error code f1

The cool indicator will off 3 seconds and blink once. This is the sign of indoor ambient temperature sensor is open/short circuited. During cooling and drying operation, indoor unit operates while other loads will stop. During heating operation, the complete unit will stop operation.

Possible reasons:

  1. Room temperature sensor hasn’t been connected well with indoor units control panel AP1
  2. Room temperature sensor is damaged.

Friedrich ac error code f2

The cool indicator will off 3 seconds and blink twice. This is the sign of indoor evaporator temperature sensor is open/short circuited. During cooling and drying operation, indoor unit operates while other loads will stop. During heating operation, the complete unit will stop operation.

Possible reasons:

  1. Room temperature sensor hasn’t been connected well with indoor units control panel AP1
  2. Room temperature sensor is damaged.

Friedrich ac error code f3

The cool indicator will off 3 seconds and blink 3 times. This is the sign of outdoor ambient temperature sensor is open/short circuited.

Possible reason:

  1. Outdoor temperature sensor hasn’t been connected well or is damaged.

Friedrich ac error code f4

The cool indicator will off 3 seconds and blink 4 times. This is the sign of outdoor condenser temperature sensor is open/short circuited.

Possible reason:

  1. Outdoor temperature sensor hasn’t been connected well or is damaged.

Friedrich ac error code f5

The cool indicator will off 3 seconds and blink 5 times. This is the sign of outdoor discharge temperature sensor is open/short circuited. During cooling and drying operation, compressor wil stop after operating for about 3 mins while indoor fan will operate. During heating operation, the complete unit will stop after operating for about 3 mins.

Possible reason:

  1. Outdoor temperature sensor hasn’t been connected well or is damaged.
  2. The head of temperture sensor hasn’t been inserted into the copper tube.

Friedrich ac error code f6

The cool indicator will off 3 seconds and blink 6 times. This is the sign of limit/decrease frequency due to overload. The aircon status now is all loads operate normally, while operation frequency for compressor is decreased.

Friedrich ac error code f8

The cool indicator will off 3 seconds and blink 8 times. This is the sign of decrease frequency due to overcurrent.

Possible reasons:

  1. The input supply voltage is too low.
  2. System pressure is too high and overload.

Friedrich ac error code f9

The cool indicator will off 3 seconds and blink 9 times. This is the sign of decrease frequency due to high air discharge.

Possible reasons:

  1. Overload or temperature is too high.
  2. Refrigerant is insufficient.
  3. Malfunction of electric expansion valve (EKV).

Friedrich ac error code ph

The cool indicator will off 3 seconds and blink 11 times. This is the sign of voltage for DC bus-bar is too high.

Possible reasons:

  1. Measure the voltage of position L and N on wiring board (XT), if the voltage is higher than 265VAC, turn on the unit after the supply voltage is increased to the normal range.
  2. If the AC input is normal, measure the voltage of electrolytic capacitor C on control panel (AP1). If it is normal, there is malfunction for the circuit, please replace the control panel (AP1).

Friedrich ac error code u5

The cool indicator will off 3 seconds and blink 13 times. This is the sign of malfunction of complete units current detection.

Possible reason:

  1. There is circuit malfunction on outdoor units control panel AP1, please replace the outdoor units control panel AP1.

Friedrich ac error code p5

The cool indicator will off 3 seconds and blink 15 times. This is the sign of overcurrent protection of phase current for compressor.

Friedrich ac error code h3

The heating indicator will off 3 seconds and blink 3 times. This is the sign of overload protection for compressor.

Possible reason:

  1. Wiring terminal OVC-COMP is loosened. In normal state, the resistance for this terminal should be less than 1obm.

Friedrich ac error code hc

The heating indicator will off 3 seconds and blink 6 times. This is the sign of PFC protection.

Friedrich ac error code h0

The heating indicator will off 3 seconds and blink 10 times. This is the sign of decrease frequency due to high temperature resistant during heating operation. All loads operate normally, while operation frequency for compressor is decreased.

Friedrich ac error code lc

The heating indicator will off 3 seconds and blink 11 times. This is the sign of failure start-up.

Friedrich ac error code u1

The heating indicator will off 3 seconds and blink 13 times. This is the sign of malfunction of phase current detection circuit for compressor.

Possible fix:

Replace outdoor contorl panel AP1

Friedrich ac error code ee

The heating indicator will off 3 seconds and blink 15 times. This is the sign of EEPROM malfunction.

Possible fix:

Replace outdoor contorl panel AP1

Friedrich ac error code pu

The heating indicator will off 3 seconds and blink 17 times. This is the sign the charging malfunction of capacitor.

Friedrich ac error code p7

The heating indicator will off 3 seconds and blink 18 times. This is the sign of malfunction of module temperature sensor circuit.

Possible fix:

Replace outdoor contorl panel AP1

Friedrich ac error code p8

The heating indicator will off 3 seconds and blink 19 times. This is the sign of module high temperature protection.

Possible fix:

After the complete unit is de-energized for 20 mins, check whether the thermal grease on IPM module of outdoor control panel AP1 is sufficient and whether the radiator is inserted tightly. If it is no use, please replace control panel AP1.

Friedrich ac error code u3

The heating indicator will off 3 seconds and blink 20 times. This is the sign of malfunction of voltage dropping for DC bus-bar.

Possible reason:

  1. Supply voltage is unstable.

Friedrich ac error code u7

This is the sign of the four-way valve is abnormal. If this malfunction accors during heating operation, the complete unit will stop operation.

Possible reasons:

  1. Supply voltage is lower than AC175V.
  2. Wiring terminal 4V is loosened or broken.
  3. 4V is damaged, please replace 4V.

Friedrich ac error code u9

This is the sign of zero-crossing malfunction of outdoor unit.

Possible fix:

Replace outdoor control panel AP1.

Friedrich ac error code pl

The heating indicator will off 3 seconds and blink 21 times. This is the sign of voltage of DC bus-bar is too low.

Possible fix:

  1. Measure the voltage of position L and N on wiring board (XT), if the voltage is higher than 150VAC, turn on the unit after the supply voltage is increased to the normal range.
  2. If the AC input is normal, measure the voltage of electrolytic capacitor C on control panel (AP1), if it is normal, there is malfunction for the circuit, please replace the control panel AP1.

Friedrich ac error code eu

This is the sign of limit/decrease frequency due to high temperature of module.

Possible fix:

Discharging after the complete unit is de-energized for 20 mins, then check whether the thermal greese on IPM module of outdoor control panel AP1 is sufficient and whether the radiator is inserted tightly. If it is no use, please replace the control panel AP1.

Friedrich ac error code fh

This is the sign of limit/decrease frequency due to antifreezing.

Possible reason:

Poor air-return in indoor unit or fan speed is too low.

Troubleshooting guides

Below we offer some malfunction diagnosis process in case you need it.

Capacity charging malfunction diagnosis process ( outdoor unit malfunction )

Friedrich ac Capacity charging malfunction diagnosis process
  • Detect if the voltage of L and N terminal of wiring board is between 210AC – 240AC by alternating voltage meter.
  • Is reactor (L) well connected? Is connection wire loosened or pull out? Is reactor damaged?

IPM protection, desynchronizing malfunction, phase current of compressor is overcurrent diagnosis process

IPM protection, desynchronizing malfunction, phase current of compressor is overcurrent diagnosis process

Main detection point:

  1. If control board AP1 and compressor COMP is well connected?> If they are loosened? If the connection sequence is correct?
  2. Is voltage input in the normal range ( test the voltage between L, N of wiring board XT by DC voltage meter )?
  3. If coil resistance of compressor is normal? Is compressor coil insulating to copper pipe well?
  4. If the work load of the unit is heavy? If radiating of unit is well?
  5. If the refrigerant charging is appropriate?

Anti-high temperature, overload protection diagnosis process

Anti-high temperature, overload protection diagnosis process

Main detection point:

  1. If the outdoor ambient temperature is in normal range.
  2. If the indoor and outdoor fan is running normal.
  3. If the radiating environment of indoor and outdoor unit is well.

Failure start up malfunction diagnosis process

Failure start up malfunction diagnosis process

Main detection point:

  1. If the compressor wiring is correct?
  2. If the stop time of compressor is enough?
  3. If the compressor is damaged?
  4. If the refrigerant charging is too much?

Compressor synchronism diagnosis process

Compressor synchronism diagnosis process

Main detection point:

  1. If the system pressure is over-high?
  2. If the work voltage is over-low?

Overload and discharge malfunction diagnosis process

Overload and discharge malfunction diagnosis process

Main detection point:

  1. If the electron expansion valve is connected well? Is the expansion valve damaged?
  2. If the refrigerant is leakage?
  3. If the overload protector is damaged?

PFC (correction for power factor) malfunction diagnosis process

PFC (correction for power factor) malfunction diagnosis process

Main detection point:

  • Check if reactor (L) of outdoor unit and PFC capacity are damaged

Communication malfunction (control board of outdoor unit) diagnosis process

Communication malfunction (control board of outdoor unit) diagnosis process

Main detection point:

  1. Check if the connection wire and the built-in wiring of indoor and outdoor unit is connected well and no damaged.
  2. If the communication circuit of indoor mainboard is damaged? If the communication circuit of outdoor mainboard (AP1) is damaged?

Outdoor communication circuit diagnosis process

Outdoor communication circuit diagnosis process

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