Air Conditioner Service Manual
11
b. When the indoor fan motor running at a low-speed under cold air prevention operation, once
auxiliary electric heating works, the vane immediately withdraws from the cold air prevention
location and turn back to normal vane angle. While auxiliary electric heating stops, indoor fan motor
goes on to run at low-speed accordingly, the vane turns to cold air prevention location
Figure 5 Cold air prevention
10.2 Failure code
The following table shows the fault protections.
When failures happens, the PCB alarms and buzzer rings three times, Failure code shows on
display board, and the PCB operates protection procedures.
Failure code: For the machine with LED display (
88
), the code shows on LED, for machine without
LED, the code reflects by the running light.
Failure
Running Light Flash
LED Display (
88
)
RT Sensor Failure
Once / cycle
E1
IPT Sensor Failure
Twice / cycle
E2
System Protection
4 times/cycle
E4
System Protection(high/low pressure
protection model)
/
E5
Indoor Fan Motor Failure
6 times / cycle
E6
While failure happens, the code displayed statically, if there are several failure codes reported at
the same time, then failure codes appears by turns every eight seconds correspondingly.
6
a.
Sensor’s
failure protection: when the sensor tested temperature out of the range ---
50°
C≤T≤
110°C, sensor failure is determined.
Once RT and/or IPT sensor failure appears, the compressor stops, and indoor and outdoor fan
motors shut off. Remote controller do
esn’t
response to any signal except for shutdown. During failure
the machine can run in fan mode. After the failure is settled, the PCB restores to standby status.
7
b. Failure protection of Indoor PG fan motor: If there is no feedback signal of rotated speed within 5s,
the indoor fan motor stops, meanwhile, the compressor, outdoor fan motor, four-way valve and/or
auxiliary electric heater etc. also cut down.
The indoor fan motor restarts again 10 seconds later, if still there is no feedback signal of rotated
speed within 5 seconds, the A/C stops and goes into indoor fan motor failure protection, buzzer
rings three times, and running light flashes at 6 times per 8 seconds. Once there is feedback signal
while the failure recovery, the failure will relieve automatically.
Set fan speed
Te
m
pe
ra
ture
dro
ppi
ng
Te
m
perat
ure
ris
in
g
Stop the fan motor
Stop the fan motor
25°C
34°C
27°
23°C
Set fan speed
Low speed
32°
C
Low speed
