Panasonic U-8ME1E81 Service Manual page 58

4. 2WAY Alarm Codes
4. 2WAY Alarm Codes
With types 8HP and 10HP, only one INV compressor is supplied.
With types 12HP, 14HP and 16HP, one INV compressor and one constant-speed
compressor (AC1) are supplied.
With types 18HP and 20HP, one INV compressor and two constant-speed compressors
(AC1, AC2) are supplied.
Alarm code
E06
E12
E15
E16
E20
E24
E25
E26
E29
E31
1
F04
F05
F22
F06
2
F07
F08
F12
F14
F16
F17
3
F23
F24
F31
H01
H11
4
H12
H03
H05
H06
H08
5
H13
H15
H21
H22
H23
H25
6
H27
H28
H31
L04
L10
7
L17
L18
8
Outdoor unit failed to receive serial communication signals from indoor unit.
Automatic address setting start is prohibited.
Automatic address setting alarm (too few units)
Automatic address setting alarm (too many units)
No indoor units at automatic address setting.
Outdoor unit (INV) failed to receive communications from another outdoor
unit (constant-speed).
Outdoor unit address setting failure (duplication)
Mismatch in outdoor unit quantity
Outdoor unit failed to receive communication from outdoor unit (main)
Communication error between the microcomputers
Compressor 1 discharge temperature sensor trouble (DISCH1)
Compressor 2 discharge temperature sensor trouble (DISCH2)
Compressor 3 discharge temperature sensor trouble (DISCH3)
Gas temperature sensor trouble at outdoor heat exchanger 1 (EXG1)
Liquid temperature sensor trouble at outdoor heat exchanger 1 (EXL1)
Outdoor air temperature sensor trouble (TO)
Compressor intake temperature sensor trouble (SCT)
Temp. sensor at refrigerant gas outlet of dual-tube (SCG)
High-pressure sensor trouble
Low-pressure sensor trouble
Gas temperature sensor trouble at outdoor heat exchanger 2 (EXG2)
Liquid temperature sensor trouble at outdoor heat exchanger 2 (EXL2)
Outdoor unit non-volatile memory (EEPROM) trouble
Compressor 1 current trouble
Constant speed compressor 2 overcurrent alarm
Constant speed compressor 2 lock current alarm
Compressor 1 CT sensor disconnected or short-circuit
Compressor 1 discharge temperature sensor disconnected
Low-pressure switch activated
Compressor 1 oil detection sensor (connection) trouble
Compressor 2 CT sensor disconnected or short-circuit
Compressor 2 discharge temperature sensor disconnected
Compressor 3 overcurrent alarm
Compressor 3 lock current alarm
Compressor 3 CT sensor disconnected or short-circuit
Compressor 3 discharge temperature sensor disconnected
Compressor 2 oil detection sensor (connection) trouble
Compressor 3 oil detection sensor (connection) trouble
HIC trouble alarm
Outdoor system address duplication
Outdoor unit capacity not set
Outdoor unit model mismatch
4-way valve operation failure
Alarm meaning
3-8
2WAY SYSTEM
Trouble Diagnosis
2WAY SYSTEM
Trouble Diagnosis
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