12-3
TROUBLESHOOTING
SM HDDHED 1-A.1 GB
2* 7
segments
LEDs
Failure
Possible Reasons
P7
HEAT LED- OFF 3s and blink
18 times
HST failure
Senor was broken or damaged
1.
PCB temperature detection cuircuit
2.
has problem
P8
HEAT LED- OFF 3s and blink
19 times
HST
overheating
protection
Insufficient attachment of IPM
1.
module to Heatsink
Outdoor PCB problem.
2.
PH
COOL LED- OFF 3s and blink
11 times
DC over voltage
AC power supply is higher than
1.
265V
Outdoor PCB circuit malfunction
2.
PL
HEAT LED- OFF 3s and blink
21 times
DC under voltage
AC power supply voltage is less
1.
than 150VAC
Outdoor PCB circuit malfunction
2.
U1
HEAT LED- OFF 3s and blink
13 times
Phase current detection
malfunction of compressor
Replace outdoor main board
U5
COOL LED-OFF 3s and blink
13 times
AC Current detection problem Replace outdoor main board.
U7
COOL LED- OFF 3s and blink
20 times
RV
is
abnormal
Supply voltage is lower than
1.
AC175V
Wiring terminal of RV is loosen or
2.
broken
RV is damaged
3.
UA
HEAT and COOL LED blink 12
times at the same time
Setting error
Outdoor unit is not matched with indoor
unit.
UF
HEAT and COOL LED blinks 7
times at the same time
Zero-crossing protection
(IDU)
Replace indoor main board
UH
HEAT and COOL LED blink 8
times at the same time
No motor of outdoor unit
feedback
This malfunction may happen when
outdoor DC motor is used.
UU
HEAT and COOL LED blink 11
times at the same time
DC over current
