Bosch 18K Multi Zone Regular System error codes
Codes
- EC07Error codeOutdoor fan speed has been out of control
- EC50Error codeOpen or short circuit of outdoor unit temperature sensor(T3,T4.T5)
- EC51Error codeOutdoor EEPROM malfunction
- EC52Error codeCondenser coil temperature sensor T3 is in open circuit or has short circuited
- EC53Error codeOutdoor room temperature sensor T4 is in open circuit or has short circuited
- EC54Error codeCompressor discharge temperature sensor TP is in open circuit or has short circuited
- EC56Error codeEvaporator coil outlet temperature sensor T2B is in open circuit or has short circuited
- EC71Error codeOver current failure of outdoor DC fan motor
- EC72Error codeLack phase failure of outdoor DC fan motor
- EL01Error codeIndoor / outdoor units communication error
- PC0AError codeHigh temperature protection of condenser
- PC0LError codeLow ambient temperature protection
- PC02Error codeTop temperature protection of compressor
- PC06Error codeTemperature protection of compressor discharge
- PC10Error code
- PC11Error codeOutdoor unit main control board DC bus high voltage protection
- PC12Error codeOutdoor unit main control board DC bus high voltage protection /341 MCE error
- PC30Error codeHigh pressure protection (For M4OB-36HFN8-Q, M5OD-42HFN8-Q, M5OE-42HFN8-Q)
- PC31Error codeLow pressure protection (For M4OB-36HFN8-Q, M5OD-42HFN8-Q, M5OE-42HFN8-Q)
- PC40Error codeCommunication malfunction between IPM board and outdoor main board
- PC45Error codeOutdoor unit IR chip drive failure
- PC49Error codeCompressor overcurrent failure
- T1Error codeIndoor ambient temperature
- T2Error codeMiddle indoor heat exchanger coil temperature
- T2BError codeIndoor heat exchanger exhaust coil temperature (located on the outdoor unit)
- T3Error codeOutdoor heat exchanger pipe temperature
- T4Error codeOutdoor ambient temperature
- T5Error codeCompressor discharge temperature