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Notes: 1) During defrosting process, the heating indicator is on for 10s and off for 0.5s.
2) Refer to Service Manual for additional information.
Outdoor Unit Indicators
Malfunction Name Possible Causes
DIAGNOSTIC CODES
Incompatible Indoor and
Outdoor Units
Compressor Phase Current
P
rotection
Module Temperature Sensor
Malfunction
Module Temperature Protection
High DC Bus Voltage Protection
Low DC Bus Voltage Protection
Capacitor Charging Malfunction
Compressor Phase-Current
Detection Malfunction
DC Bus Voltage Dip
Input Current Detection Malfunction
The four-way valve is abnormal
Zero cross detection circuit
malfunction(for indoor unit)
Indoor and outdoor units are not compatible
1) IPM module malfunction
2
) Outdoor control board malfunction
3) Compressor malfunction
Outdoor control board malfunction
1) Lack of thermal grease on IPM module
2) Heat sink (radiator) not tightly mounted
3) Control board malfunction
1) Supply voltage on L1 and N is above 265Vac
2) Capacitor on control board malfunction
3) Outdoor control board malfunction
1) Supply voltage on L1 and N is below 150Vac
2) Capacitor on control board malfunction
3) Outdoor control board malfunction
Capacitor malfunction
Outdoor control board malfunction
Outdoor control board malfunction
Outdoor control board malfunction
Hardware malfunction
Hardware malfunction
L
P
P5
P7
P8
PH
PL
PU
U1
U3
U5
U7
U8
Y
ellow
16 flashes
and 1 sec Off
13 flashes
and 1 sec Off
12 flashes
and 1 sec Off
R
ed
28
T
ether
C
ontrol
D
isplay
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