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
Outdoor unit protected 5 times / cycle E5
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.
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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 doesn’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.
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b. Outdoor unit protected. When the outdoor PCB has checked the high pressure, high current or the
3-phase mistake, the compressor stops, indoor and outdoor fan motors shut off. When the protected
relieve, the machine start again.
Set fan speed
Temperature dropping
Temperature rising
Stop the fan motor
Stop the fan motor
25°C
34°C
27°
23°C
Set fan speed
32°C
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