Kinghome Heat Pump Error Codes

Updated October 13, 2026 · by Aurora Star Tech Inc.

55 Kinghome Heat Pump error codes and diagnostic codes, with causes and troubleshooting steps for each. Select a code, or find your model below.

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Kinghome Heat Pump error codes list

Code	Meaning	Severity
A1	Outdoor fan IPM module protection	High
AC	Outdoor fan startup failure	High
AE	Outdoor fan current detection error	High
AJ	Outdoor fan out-of-step	High
C4	ODU jumper cap error	Medium
C5	Jumper cap missing or wrong	Medium
C8	ODU drive jumper cap error	Medium
E1	High pressure protection / high-pressure sensor fault	High
E2	Indoor coil anti-freeze protection	Medium
E3	Low pressure protection / low-pressure sensor fault	High
E4	Compressor discharge temperature too high	High
E5	Overcurrent protection	Medium
E6	Indoor/outdoor communication fault	High
E8	High temperature resistance (overload) protection	Medium
E9	Water overflow protection	Medium
EE	Memory chip fault	High
EU	Frequency reduced - module too hot	Low
F0	Refrigerant recovery mode	Low
F1	Indoor room temperature sensor fault	Medium
F2	Sensor fault (indoor coil or outdoor condenser)	Medium
F3	Outdoor ambient temperature sensor fault	Medium
F4	Sensor fault (outdoor condenser or discharge)	Medium
F5	Outdoor discharge temperature sensor fault	Medium
F6	Frequency limit for overload / ODU tube sensor fault	Medium
F8	Frequency reduced - overcurrent	Low
F9	Frequency reduced - high discharge temperature	Low
FH	Frequency reduced - anti-freeze	Low
H3	Compressor overload protection	High
H4	Overload protection (high condensing pressure)	High
H5	IPM module protection	Critical
H6	Fan motor feedback fault (indoor or outdoor)	High
H7	Compressor out-of-step	High
HC	PFC protection	High
L3	Outdoor DC fan motor fault	High
L9	Power limit protection	Medium
LC	Compressor start failure	High
LP	Indoor and outdoor unit mismatch	High
P0	Compressor minimum-frequency test / driver reset	Low
P1	Compressor rated-frequency test display	Low
P2	Compressor maximum-frequency test display	Low
P3	Compressor intermediate-frequency test display	Low
P5	Compressor phase overcurrent	High
P6	Main-to-driver communication error	High
P7	Module temperature sensor circuit fault	Medium
P8	Power module over-temperature	High
PA	AC current protection	High
Pc	Drive current detection error	High
PH	DC bus voltage high	High
PL	DC bus voltage low	High
PU	Capacitor charging failure	High
U1	Compressor phase current detection circuit fault	High
U3	DC bus voltage drop fault	Medium
U5	Whole-unit current detection fault	High
U7	Four-way valve abnormal	High
UL	Outdoor fan overcurrent	High

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General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.

Kinghome Heat Pump error codes list

Find codes by Kinghome model

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