F1# indoor temperature sensor failure
F2# indoor heat exchanger sensor failure
F3# remain
F4# heating overload
F5# cooling freezed
F6# remain
F7# communication failure
Outdoor
E1# module failure
E2# no load
E3# remain
E4# compressor overheat
E5# over total current
E6# ambient temperature sensor failure
E7# heat exchanger sensor failure
E8# low pressure protection
E9# remain
EA# power over voltage protection
EB# remain
EC# cooling overload
ED# remain
EE# EEPROM wrong
The indicator LED1, LED2 of indoor PCB can be used to display failure code, which is as the same as
that of VFD. LED3 is used to display compressor operation. The codes are as follow:
LED1 LED2 remarks
No Failure description Failure reason
state times state times
1 Room temp.
sensor failure
Short/open
circuit
flash 1 OFF
2 Heat exchanger
sensor failure
Short/open
circuit
flash 2 OFF
3 Heating overload
Tcoil>72℃
flash 4 OFF
4 Iced in cooling
Tcoil<-1℃
flash 5 OFF
5 Communication
failure
Communication
circuit failure
flash 7 OFF
Indoor
failure
Failure display of LED1, LED2, LED3, LED4 on outdoor PCB
LED4 LED3 LED2 LED1
No
(failure
code)
Failure description Failure reason
state state state state
Note
1 Module failure
Module overheat,
over current, short
circuit
OFF OFF OFF ON
Outd
oor
failur
>a__WcU[S^ <[c >a`V[e[a`Wc
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