Bosch CL3000iU W 26 E - Troubleshooting Common Issues; Identifying Faults with Error Codes; Resolving Non-Indicated Faults

Troubleshooting
55
Climate 3000i – 6721823680 (2023/03)
Table 71
Note: units set to cooling / dry / fan mode will be affected with a mode
conflict as soon as one other unit in the system is set to heating (heating
is the priority system mode).
5.2 Faults not indicated
Table 72
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
EH 00
Faulty parameter in the EEPROM of the indoor unit
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)
EL 0C
1)
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.
Special condition Possible cause
-- Conflicting operating mode of indoor units; operating mode of indoor units and outdoor unit must correspond.
1)
1) Conflicting operating mode of indoor unit. This can occur in a multi split system, when different units operate in different modes. To solve the problem, adjust operating mode
accordingly.
Fault code Possible Cause
Fault Possible cause Remedy
The output of the indoor unit is too low. Heat exchanger of the outdoor or indoor unit
contaminated or partially blocked.
▶ Clean heat exchanger of outdoor or indoor
unit.
Shortage of refrigerant ▶ Check tightness of pipes, reseal if required.
▶ Refill refrigerant.
Outdoor unit or indoor unit is not working. No current ▶ Check power connection.
▶ Power on the IDU.
Leakage protector or fuse installed in the
device
1)
has blown.
1) A fuse for the overcurrent protection is located on the main PCB. The specification is printed on the main PCB and can also be found in the technical data on page 57.
▶ Check power connection.
▶ Check the leckage protection and fuse.
Outdoor unit or indoor unit starts and stops
continuously.
Insufficient refrigerant in the system. ▶ Check tightness of pipes, reseal if required.
▶ Refill refrigerant.
Too much refrigerant in the system. Remove refrigerant with refrigerant recovery
unit.
Moisture or impurities in the refrigerant circuit. ▶ Evacuate refrigerant circuit.
▶ Fill with new refrigerant.
Voltage fluctuations too high. ▶ Install voltage regulator.
Defective compressor. ▶ Replace compressor.