Panasonic U-8ME1E8E Service Manual page 150

4. 2WAY Alarm Codes
With type 8HP, the INV compressor is compressor 1 only.
With types 10HP, 12HP, 14HP and 16HP, the INV compressor is compressor 1, and the
constant-speed compressors (AC1) are compressors 2 .
With types 18HP and 20HP, the INV compressor is compressor 1, and the constant-speed
compressors (AC1, AC2) are compressors 2 and 3.
Alarm code
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 (INV) failed to receive communications from another outdoor
unit (constant-speed).
E25 Outdoor unit address setting failure (duplication)
E26 Mismatch in outdoor unit quantity
E29 Outdoor unit failed to receive communication from outdoor unit (main)
E31 Communication error between the microcomputers
F04 Compressor 1 discharge temperature sensor trouble
F05 Compressor 2 discharge temperature sensor trouble
F22 Compressor 3 discharge temperature sensor trouble
F06 Gas temperature sensor trouble at outdoor heat exchanger 1 (In)
F07 Liquid temperature sensor trouble at outdoor heat exchanger 1 (Out)
F08 Outdoor air temperature sensor trouble
F12 Compressor intake temperature sensor trouble
F16 High-pressure sensor trouble
F17 Low-pressure sensor trouble
F23 Gas temperature sensor trouble at outdoor heat exchanger 2 (In)
F24 Liquid temperature sensor trouble at outdoor heat exchanger 2 (Out)
F31 Outdoor unit non-volatile memory (EEPROM) trouble
H11 Constant speed compressor 2 overcurrent alarm
H12 Constant speed compressor 2 lock current alarm
H03 Compressor 1 CT sensor disconnected or short-circuit
H05 Compressor 1 discharge temperature sensor disconnected
H06 Low-pressure switch activated
H08 Compressor 1 oil detection sensor (connection) trouble
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 oil detection sensor (connection) trouble
H28 Compressor 3 oil detection sensor (connection) trouble
H31 HIC trouble alarm
L04 Outdoor system address duplication
L10 Outdoor unit capacity not set
L17 Outdoor unit model mismatch
L18 4-way valve operation failure
Alarm meaning
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2WAY SYSTEM
Trouble Diagnosis
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