Airwell AWAU-YDD018-H11, Service Manual

Page: 39 / 48

12-3
TROUBLESHOOTING
SM HDDHED 2-A.1 GB
Indoor indicators Outdoor indicators
Failure
Possible Reasons/Corrective
actions
2* 7
segments
LEDs
(RUN,COOL,HEAT)
D40 D41 D42 D43
H3
HEAT OFF 3S and
blink 3 times
□ □
Compressor overload
protection
Connection of compressor 1.
OLP is loosen (the resistance
for this terminal should be less
than 1ohm)
EEV connection problem or
2.
damaged/Capilliary problem
Refrigeratn leakage
3.
H4
HEAT OFF 3S and
blink 4 times
■ □ ■ ■ System is abnormal
Too high ambient temperature 1.
Poor heat exchange 2.
(including blockage and bad
radiating environment )
H5
HEAT OFF 3S and
blink 5 times
□ □ IPM protection
Abnormal power input 1.
voltage.
Compressor wiring mistake. 2.
Liquid and gas valve are not 3.
open.
EEV damaged or not proper 4.
working
Poor heat exchage. 5.
Over charged system. 6.
HC
HEAT OFF 3S and
blink 6 times
□ ■ PFC protection
PFC module assembly 1.
problem.
Poor heat exchange of 2.
Heatsink
PFC reactor problem. 3.
Abnormal power voltage 4.
PFC cuicuit problem on PCB 5.
H7
HEAT OFF 3S and
blink 7 times
□ ■
Desynchronizing of
compressor
Abnormal power input 1.
voltage.
Compressor wiring mistake. 2.
Liquid and gas valve are not 3.
open.
EEV damaged or not proper 4.
working
Poor heat exchage. 5.
Over charged system. 6.
H0
HEAT OFF 3S and
blink 10 times
■ □
HZ down due to Coil over
heating protection
Too high ambient temperature 1.
Poor heat exchange 2.
(including blockage and bad
radiating environment )
Lc
HEAT OFF 3s and
blink 11 times
□ □ Start-up failure
Compressor wiring mistake 1.
Over charged system 2.
System not balanced before 3.
compressor starting
Compressor problem
4.
U1
HEAT OFF 3s and
blink 13 times
□ ■ □
Malfunction of phase
current detection circuit for
compressor
Phase current detection circuit for
compressor has problem.
EE
HEAT OFF 3s and
blink 15 times
□ □ □ ■ EEPROM failure Replace indoor controller
PU
HEAT OFF 3S and
blink 17 times
□ ■ □ ■
Charging malfunction of
capacitor
Reactor open 1.
Charging relay or other 2.
components damaged on
PCB.
P7
HEAT OFF 3s and
blink 18 times
□ □ ■ HST failure
Replace outdoor controller
P8
HEAT OFF 3s and
blink 19 times
■ □ ■ HST over heating protection
Insufficient grease on heatsink 1.
or poor connection of heatsink
to PCB
Outdoor PCB problem.
2.
U3
HEAT OFF 3s and
blink 20 times
□ ■ ■ ■
Malfunction of voltage
dropping for DC BUS
Supply voltage is unstable