Airwell AWAU-YBZE218-H11, Service Manual

Page: 52 / 68

TROUBLESHOOTING
13-2 Service Manual
– YBZE DCI 1-A.1 GB
13.1.3 Fault Code display from ODU
The ODU can not show fault directly, can only know whether there is fault status by Communication LED.
(Fault status
– LED ON 1sec, OFF 1sec. )
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)
Fault description 2* 7
segments
LEDs blinking Possible Reason
RUN COO
L
HEAT
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 1. Senor was broken or damaged
2. PCB temperature detection circuit has
problem
ICT failure F2 2
OAT failure F3 3
CTT failure F5 5
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 1. Senor was broken or damaged
2. PCB temperature detection circuit has
problem
RLT failure b5 19
RGT failure b7 22
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.