Service Outdoor unit errors Fault Description NO RESET RESET Volatile User reset HP Power Service reset OFF 905 HP compressor mismatch error - - X - 906 HP fan mismatch error - - X - 907 HP 4-way valve mismatch error - - X - 908 Expansion valve mismatch error - - X - 909 Fan off and heat pump on - - X - 910 Inverter-TDM communication error X - - - 912 4-way valve error - - - X 913 LWT sensor error X - - - 914 TR sensor error X - - - 917 Freeze error - - - X 918 Pump down error - - - X 922 Freeze error - X - - 931 Inverter error X - - - 947 4-way valve error - X - - 950 Compressor delivery sensor error - - - X 951 TD sensor error - X - - 956 HP compressor model mismatch - - X - 957 HP fan model mismatch - - X - 960 HP EWT sensor error X - - - 962 Defrost energy X - - - 968 ATGBUS TDM-EM communication error X - - - 994 Low refrigerant charge error - X - - 997 Compressor overcurrent - - X - 998 Compressor overcurrent - - - X 9E5 High-pressure pressure switch intervention X - - - 9E8 Low-pressure pressure switch error with compressor X - - - OFF 9E9 Klixon error with compressor OFF X - - - 9E18 ST1 safety thermostat error X - - - 9E21 Low refrigerant charge error - X - - 9E22 Machine empty error - - - X 9E24 EXV seized up error - X - - 9E28 High pressure protection - X - - 9E29 High pressure protection - - - X 9E31 Compressor thermostat protection - X - - 9E32 Compressor thermostat protection - - - X 9E34 Low-pressure protection - X - - 9E35 Low-pressure protection - - - X 9E36 Compressor phases current imbalance - X - - 9E37 Compressor phases current imbalance - - - X 9E38 Excessively steep compressor current variation - X - - 9E39 Excessively steep compressor current variation - - - X 72 / EN
Service Inverter error Description Code (for inverter errors falling within error code 931) 35 M - 50 M - 80 M NIMBUS EXT R32 80 M-T - 120 M-T - 150 M-T 120 M - 150 M Inverter output current sensor error 1 x x x DC bus capacitors pre-charge error 2 x Inverter input voltage sensor error 3 x Inverter heat sink temperature sensor error 4 x x x DSP&MCU communication error 5 x Inverter input AC overcurrent 6 x x x Inverter PFC current sensor error 7 x x Inverter PFC temperature sensor error 8 x x Corrupt EPROM 9 x x PFC HW overcurrent 10 x x PFC SW overcurrent 11 x x Inverter PFC overvoltage 12 x x A/D error 13 x x Addressing error 14 x x Compressor inverse rotation 15 x x No current variation on compressor phase 16 x x Misalignment between real and calculated 17 x x x speed Vaux inverter error 18 Vstep Inverter/Control Board error 19 Inrush circuit error 20 PFC inverter error 21 DC bus overcurrent 22 Inverter module error 23 Compressor loss of synchronism 24 PCB overheating 25 HW interruption 26 Absence of configuration 27 x x x SW error 28 EN / 73
Service Outdoor unit errors Fault Description NO RESET RESET Volatile User reset HP Power Service reset OFF 905 HP compressor mismatch error - - X - 906 HP fan mismatch error - - X - 907 HP 4-way valve mismatch error - - X - 908 Expansion valve mismatch error - - X - 909 Fan off and heat pump on - - X - 910 Inverter-TDM communication error X - - - 912 4-way valve error - - - X 913 LWT sensor error X - - - 914 TR sensor error X - - - 917 Freeze error - - - X 918 Pump down error - - - X 922 Freeze error - X - - 931 Inverter error X - - - 947 4-way valve error - X - - 950 Compressor delivery sensor error - - - X 951 TD sensor error - X - - 956 HP compressor model mismatch - - X - 957 HP fan model mismatch - - X - 960 HP EWT sensor error X - - - 962 Defrost energy X - - - 968 ATGBUS TDM-EM communication error X - - - 994 Low refrigerant charge error - X - - 997 Compressor overcurrent - - X - 998 Compressor overcurrent - - - X 9E5 High-pressure pressure switch intervention X - - - 9E8 Low-pressure pressure switch error with compressor X - - - OFF 9E9 Klixon error with compressor OFF X - - - 9E18 ST1 safety thermostat error X - - - 9E21 Low refrigerant charge error - X - - 9E22 Machine empty error - - - X 9E24 EXV seized up error - X - - 9E28 High pressure protection - X - - 9E29 High pressure protection - - - X 9E31 Compressor thermostat protection - X - - 9E32 Compressor thermostat protection - - - X 9E34 Low-pressure protection - X - - 9E35 Low-pressure protection - - - X 9E36 Compressor phases current imbalance - X - - 9E37 Compressor phases current imbalance - - - X 9E38 Excessively steep compressor current variation - X - - 9E39 Excessively steep compressor current variation - - - X 72 / EN
Service Inverter error Description Code (for inverter errors falling within error code 931) 35 M - 50 M - 80 M NIMBUS EXT R32 80 M-T - 120 M-T - 150 M-T 120 M - 150 M Inverter output current sensor error 1 x x x DC bus capacitors pre-charge error 2 x Inverter input voltage sensor error 3 x Inverter heat sink temperature sensor error 4 x x x DSP&MCU communication error 5 x Inverter input AC overcurrent 6 x x x Inverter PFC current sensor error 7 x x Inverter PFC temperature sensor error 8 x x Corrupt EPROM 9 x x PFC HW overcurrent 10 x x PFC SW overcurrent 11 x x Inverter PFC overvoltage 12 x x A/D error 13 x x Addressing error 14 x x Compressor inverse rotation 15 x x No current variation on compressor phase 16 x x Misalignment between real and calculated 17 x x x speed Vaux inverter error 18 Vstep Inverter/Control Board error 19 Inrush circuit error 20 PFC inverter error 21 DC bus overcurrent 22 Inverter module error 23 Compressor loss of synchronism 24 PCB overheating 25 HW interruption 26 Absence of configuration 27 x x x SW error 28 EN / 73
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