156
TROUBLESHOOTING
Error code
Contents Error detection / Judgment
RC
display
Outdoor control PCB
Code Sub code
CJ 17 n (Air net
address)
Indoor remote controller sensor
failure
Indoor remote controller sensor disconnection or short circuit
during operation.
C1 27 n (Air net
address)
Indoor unit transmission failure
(Indoor control PCB - fan PCB,
Indoor control PCB - adapter
PCB)
Communication failure between indoor PCBs
C4 18 n (Air net
address)
Indoor heat exchanger liquid
pipe temperature sensor
disconnection or short circuit
One or more thermistors do not work due to disconnection or
short circuit. (Input value is abnormal.)
C5 19 n (Air net
address)
Indoor heat exchanger vapor
pipe temperature sensor
disconnection or short circuit
One or more thermistors do not work due to disconnection or
short circuit. (Input value is abnormal.)
C6 28 n (Air net
address)
Indoor unit combination failure
(Indoor control PCB - fan PCB)
Combination failure of the indoor PCBs.
C9 97 n (Air net
address)
Indoor intake air temperature
sensor disconnection or short
circuit
One or more thermistors do not work due to disconnection or
short circuit. (Input value is abnormal.)
EA 57 0 Reversing valve switching
failure
1. The decision for reversing valve switching failure is
"FAILURE". OR
2. Compressor discharge temperature sensor detects 203
℉
(95 ℃ ) or higher when the reversing valve "with switching"
is starting.
EC 80 0 Overheated engine coolant The engine coolant temperature sensor detects 221
℉ (105 ℃ )
or higher for 10 seconds during engine operation.
When engine coolant temperature sensor detectes 160
℉ (71℃
) or higher for 60 seconds during engine starting, the unit be-
comes error standby status. Detection continues for 15 minutes
after that.
3 Overcooled engine coolant 15 minutes after engine starting, the engine coolant tempera-
ture sensor detects lower than 122
℉ (50 ℃ ) for 10 seconds.
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