Faults Without Indication - Bosch CL3000iU W 35 E Installation Instructions Manual

Fault code Possible Cause
EC 07 Fan speed of outdoor unit outside the normal range
EC 51 Faulty parameter in the EEPROM of the outdoor unit
EC 52 Temperature sensor error at T3 (condenser coil)
EC 53 Temperature sensor error at T4 (outside temperature)
EC 54 Temperature sensor error at TP (compressor discharge pipe)
EC 56 Temperature sensor error at T2B (outlet of evaporator coil; only multi-split air conditioner)
EH 0A Faulty parameter in the EEPROM of the indoor unit
EH 00
EH 0b Communication error between main PCB of indoor unit and display
EH 02 Fault when detecting the zero-crossing signal
EH 03 Fan speed of indoor unit outside the normal range
EH 60 Temperature sensor error at T1 (room temperature)
EH 61 Temperature sensor error at T2 (centre of evaporator coil)
1)
EL 0C Insufficient or escaping refrigerant or temperature sensor error at T2
EL 01 Communication error between IDU and ODU
PC 00 Fault at IPM module or IGBT overcurrent protection
PC 01 Over- or undervoltage protection
PC 02 Temperature protection at compressor or overheating protection at IPM module or pressure relief device
PC 03 Low pressure protection
PC 04 Inverter compressor module error
PC 08 Protection against current overload
PC 40 Communication fault between main PCB of outdoor unit and main PCB of compressor drive
−− Conflicting operating mode of indoor units; operating mode of indoor units and outdoor unit must correspond.
1) Leak detection not active, if in a system with multi-split air conditioner.
Table 10
5.2

Faults without indication

Error
The output of the indoor unit is too low.
Outdoor unit or indoor unit is not working.
Outdoor unit or indoor unit starts and stops
continuously.
1) A fuse for overcurrent protection is located on the PCB. The specifications of the fuse are printed on the PCB and can also be found in the technical data on page 63. Only use
a blast-proof ceramic fuse.
Table 11
Climate 3000i – 6721823680 (2022/10)
Possible Cause
Heat exchanger of outdoor or indoor unit soiled. ▶ Clean heat exchanger of outdoor or indoor
Lack of refrigerant
No power
1)
RCD or built-in fuse has tripped.
Insufficient refrigerant in the system.
Too much refrigerant in the system.
Moisture or impurities in the refrigerant circuit.
Voltage fluctuations too high.
Defective compressor.
Remedy
unit.
▶ Check tightness of pipes, reseal if required.
▶ Refill refrigerant.
▶ Check power connection.
▶ Power on the indoor unit.
▶ Check power connection.
▶ Check RCD or fuse.
▶ Check tightness of pipes, reseal if required.
▶ Refill refrigerant.
▶ Remove refrigerant with refrigerant recovery
unit.
▶ Evacuate refrigerant circuit.
▶ Fill with new refrigerant.
▶ Install voltage regulator.
▶ Replace compressor.
Troubleshooting
61