Airwell YBZ214, Service Manual

Page: 57 / 76

TROUBLESHOOTING
13-4 Service Manual – YBZ DCI 1-A.1 GB
13.1.4 Fault Code display from IDU
If the malfunction still exists 4min later after stop of unit due to compressor protection, error code will be
directly displayed though indoor display. In other situations, fault code can be displayed by pressing
LIGHT button 6 times within 4s.
Fault code can be displayed on 2*7 segments or by the LEDs blinking (OFF for 3s and then with certain
blinking as following)
LEDs blinking
Fault description
2* 7
segments
RUN COOL HEAT
Possible Reason
HP switch protection E1 1
1. Refrigerant was superabundant
2. Poor heat exchange (including blockage
and bad radiating environment )
3. Too high ambient temperature
Indoor coil defrost Protection E2 2
1. Poor air-return in indoor unit
2. Fan speed is abnormal
3. Evaporator is dirty.
Compressor over Heating
Protection
E4 4
1. EEV connection problem or damage
2. Refrigerant
leakage
3. Poor heat exchange
AC Over current protection E5 5
1. Supply voltage is unstable
2. Supply voltage is too low and load is too
high
Communication malfunction E6 6
1. Wiring mistakes
2. IDU or ODU PCB problem
Mode conflict E7 7 Mode conflict to other IDU
Indoor coil/Outdoor coil over
heating protection
E8 8
1. Too high ambient temperature
2. Poor heat exchange (including blockage
and bad radiating environment )
No feedback of indoor motor H6 11
1. IFAN motor damaged
2. IFAN motor blocked
3. IDU PCB problem
Malfunction protection of jumper
cap
C5 15 Poor connection of the jumper on indoor PCB.
Zero-crossing protection (IDU) U8 17
1. IFAN motor damaged
2. Zero-crossing circuit damaged on IDU
PCB
Mismatch of IDU and ODU LP 19
RAT failure F1 1
ICT failure F2 2
OAT failure F3 3
CTT failure F5 5
1. Senor was broken or damaged
2. PCB temperature detection circuit has
problem
DC over voltage PH 11
1. AC input voltage is too high.
2. Reactor has problem
3. ODU PCB has problem
OCT failure F4 18
RLT failure b5 19
RGT failure b7 22
1. Senor was broken or damaged
2. PCB temperature detection circuit has
problem
Compressor overload protection H3 3
1. EEV connection problem or damaged
2. Refrigerant
leakage
3. OLP damaged
IPM protection H5 5
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.