Panasonic U-8ME1E81 Service Manual page 94

1. Self-Diagnostics Function Table
1. Self-Diagnostics 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
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
E31 Communication error between the microcomputers
F04 Compressor 1 discharge temperature sensor trouble
F05 Compressor 2 discharge temperature sensor trouble
F06 Gas temperature sensor trouble at outdoor heat exchanger 1
F07 Liquid temperature sensor trouble at outdoor heat exchanger 1
F08 Outdoor air temperature sensor trouble
F12 Compressor intake temperature sensor trouble
1
F14 SCG temperature sensor trouble
F16 High-pressure sensor trouble
F17 Low-pressure sensor trouble
F22 Compressor 3 discharge temperature sensor trouble
F23 Gas temperature sensor trouble at outdoor heat exchanger 2
2
F24 Liquid temperature sensor trouble at outdoor heat exchanger 2
F31 Outdoor unit non-volatile memory (EEPROM) trouble
H01 Compressor 1 current trouble
H03 Compressor 1 CT sensor disconnected or short-circuit
H05 Compressor 1 discharge temperature sensor disconnected
H06 Low-pressure trouble
3
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
4
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
5
L04 Outdoor unit address duplication
L10 Outdoor unit capacity not set
L17 Outdoor unit model mismatch
L18 4-way valve operation failure.
P02 Compressor thermal protector is activated.(trip only and no alarm)
P03 Compressor 1 discharge temperature trouble
6
P04 High-pressure switch activated
P05 Reverse phase (or missing phase) detected, capacity mismatch
P14 O
P16 Compressor 1 overcurrent
P17 Compressor 2 discharge temp trouble
7
P18 Compressor 3 discharge temp trouble
P20 High load alarm
P22 Fan motor trouble
P29 Inverter compressor missing phase or lock alarm
8
sensor is activated.
2
Alarm meaning
5-4
2WAY SYSTEM
2WAY SYSTEM
Self-Diagnostics Function Table
Self-Diagnostics Function Table
(DISCH1)
(DISCH2)
(EXG1)
(EXL1)
(SCT)
(SCG)
(HPS)
(LPS)
(DISCH3)
(EXG2)
(EXL2)
(TO)