Sanyo KHX0952, UHX2452, UHX0752, UHX1252, UHX3652, UHX1852, THX2452 Alarm code Alarm meaning, DISCH2

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Self-Diagnosis Function Table

1. Self-Diagnosis Function Table

•The outdoor unit maintenance remote controller can be used to check the alarm display.

The number of times that LED 1 and 2 blink on the outdoor unit control PCB can be used to check the alarm display. (Refer to “Checking the LED 1 and 2 Alarm Display on the Outdoor Unit Control PCB.”)

Alarm code	Alarm meaning
E06	Outdoor unit failed to receive serial communication signals from indoor unit.
E12	Automatic address setting start is prohibited.
E15	Automatic address setting alarm (too few units)
E16	Automatic address setting alarm (too many units)
E20	No indoor units at automatic address setting.
E24	Outdoor unit failed to receive communications from another outdoor unit.
E25	Outdoor unit address setting failure (duplication)
E26	Mismatch in outdoor unit quantity
E29	Outdoor unit failed to receive communication from another outdoor unit.
E30	Outdoor unit serial communications failure
F04	Compressor 1 discharge temperature sensor trouble	(DISCH1)
F05	Compressor 2 discharge temperature sensor trouble	(DISCH2)
F06	Gas temperature sensor trouble at outdoor heat exchanger 1	(EXG1)
F07	Liquid temperature sensor trouble at outdoor heat exchanger 1	(EXL1)
F08	Outdoor air temperature sensor trouble	(AIR TEMP)
F12	Compressor intake temperature sensor trouble	(SCT)
F16	High-pressure sensor trouble	(HPS)
F17	Low-pressure sensor trouble	(LPS)
F22	Compressor 3 discharge temperature sensor trouble	(DISCH3)
F23	Gas temperature sensor trouble at outdoor heat exchanger 2	(EXG2)
F24	Liquid temperature sensor trouble at outdoor heat exchanger 2	(EXL2)
F31	Outdoor unit non-volatile memory (EEPROM) trouble
H03	Compressor 1 CT sensor disconnected or short-circuit
H06	Low-pressure trouble
H08	Compressor 1 oil detection sensor (connection) trouble
H11	Constant speed compressor 2 overcurrent alarm
H12	Constant speed compressor 2 lock current alarm
H13	Compressor 2 CT sensor disconnected or short-circuit
H15	Compressor 2 discharge temperature sensor disconnected
H21	Compressor 3 overcurrent alarm
H22	Compressor 3 lock current alarm
H23	Compressor 3 CT sensor disconnected or short-circuit
H25	Compressor 3 discharge temperature sensor disconnected
H27	Compressor 2 lock current alarm
H28	Compressor 3 lock current alarm
H31	HIC trouble alarm
L04	Outdoor unit address duplication
L05	Duplicated indoor unit priority (alarm at priority indoor units)
L06	Duplicated indoor unit priority (alarm at non-priority indoor units and outdoor unit)
L10	Outdoor unit capacity not set
L17	Outdoor unit model mismatch
L18	4-way valve operation failure.
P03	Compressor 1 discharge temperature trouble
P04	High-pressure switch activated
P05	Reverse phase (or missing phase) detected, capacity mismatch
P14	O2 sensor is activated.
P16	Compressor 1 overcurrent
P17	Compressor 2 discharge temp trouble
P18	Compressor 3 discharge temp trouble
P22	Fan motor trouble
P26	Inverter compressor high-frequency overcurrent alarm
P29	Inverter compressor missing phase or lock alarm

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