Airwell YUDE024, Service Manual

Page: 48 / 72

TROUBLESHOOTING
SM YUDE 2-A.1 GB 12-3
F4 F4 CTT failure
F5 - RCT failure
P0 P0 IPM reset
P5 P5
Compressor phase current detection
problem Phase current detection circuit for compressor has
problem.
P7 P7 HST failure PCB is damaged
P8 P8 Heat sink overheating protection
1. Insufficient grease on heatsink or poor
connection of heatsink to PCB
2. Outdoor PCB problem.
P9 P9 AC contactor protection
Pc Pc Current sensor failure PCB is damaged
Pd Pd Sensor connection protection
PE PE Temperature shift protection
PH PH DC over voltage protection 1. AC power supply is higher than 265V
2. Outdoor PCB circuit malfunction
PL PL DC under voltage protection 1. AC power supply voltage is less than 150VAC
2. Outdoor PCB circuit malfunction
H3 H3 Compressor over load protection
1. Connection of compressor OLP is loosen (the
resistance for this terminal should be less than
1ohm)
2. EEV connection problem or
damaged/Capillary problem
3. Refrigerant leakage
H4 Overload protection
1. Too high ambient temperature outdoor side
(cooling mode) or indoor side (Heating mode)
2. Poor heat exchange (including blockage and
bad radiating environment )
H5 H5 IPM protection
1. Abnormal power input voltage.
2. Compressor wiring mistake.
3. Liquid and gas valve are not open.
4. EEV damaged or not proper working
5. Poor heat exchange.
6. Over charged system.
H6 H6 Outdoor DC Fan error
1. Bad contact of DC motor feedback terminal.
2. Bad contact of DC motor control end.
3. Fan motor is blocked.
4. Motor malfunction
5. Malfunction of main board rev detecting circuit.
H7 H7 Desynchronizing of compressor
1. Abnormal power input voltage.
2. Compressor wiring mistake.
3. Liquid and gas valve are not open.
4. EEV damaged or not proper working
5. Poor heat exchange.
6. Over charged system.
Hc Hc PFC protection
1. PFC module assembly problem.
2. Poor heat exchange of Heatsink
3. PFC reactor problem.
4. Abnormal power voltage
5. PFC circuit problem on PCB
Lc Lc Compressor startup failure
1. Compressor wiring mistake
2. Over charged system
3. System not balanced before compressor
starting
4. Compressor problem
Ld Ld Lack phase protection of compressor
1. Phase current detection circuit for compressor
has problem.
2. Comp wiring mistake
LF LF Compressor over speed
1. Compressor wiring mistake
2. The compressor wire go cross the relative
current sensor
3. IPM damage
U7 U7 RV is abnormal
1. Supply voltage is lower than AC175V;
2. Wiring terminal RV is loosened or broken;
3. RV is damaged.