Air Conditioner Service Manual
original running state automatically.
2) To press the emergency button and power on the unit, and hold on for 10 seconds, The buzzer
will ring
three times
, after this operation, the auto restart function is activated
3) To close auto restart function while it is activated, repeat process as above 2), the buzzer will ring
four times.
9. Protection/ Troubleshooting.
1) Compressor’s protection:
a
.
The PCB which has Auto-restart function, once this function is started up, the compressor goes
along 3min delay protection when power on. If the PCB hasn’t been started up Auto-restart
function, even when the PCB is power-on, the compressor doesn’t process 3 min delay function.
b
.
The compressor’s 3 min interval protection: the compressor can’t start-up until it stops 3 min later.
(except for defrosting process).
c
．
After the compressor started, the compressor’s state isn’t subjected to the changes on ST,RT in 3min.
2) Anti-frosting protection of indoor evaporator (cooling mode):
If IPT ≤ 0
℃
detected in consecutive 3 min, compressor and outdoor fan motor stopped, indoor fan
motor runs at high-speed forcibly; if IPT ≥ 5
℃
detected 3min later, then outdoor fan mot or and
compressor activated, indoor fan motor restores the original state.
3) The following table shows the fault protections. When failures happens, the PCB alarms and
buzzer rings three times. Failure code appears, and the PCB operates protection procedures.
Failure code: For the machine with LED display, the code shows on LED, for machine without LED,
the code reflects by the running light.
Failure
Running Light Flash
LED Display
RT Sensor Failure
Once / Period
E1
IPT Sensor Failure
Twice / Period
E2
Indoor Fan Motor Failure
6 times / Period
E6
When failure happened, the code is displayed statically, if there are several failure codes should be
reported at the same time, then failure codes appears one by one every eight seconds
correspondingly.
a. Sensor’s failure protection: when the sensor’s temperature is out of the range -50 ≤ T ≤ 110
℃
,
then sensor failure is determined. Once RT, IPT sensor failures appear, 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.
b. Failure protection of Indoor PG fan motor: If there is no feedback signal of rotate speed within 5s,
the indoor fan motor stops, meanwhile, the compressor, outdoor fan motor, four-way valve and
auxiliary electric heater etc. cut down. 10 seconds later, the indoor fan motor restarts again, once
there is no feedback signal of rotate speed within 5 seconds either, then the machine stops and
goes into indoor fan motor failure protection, buzzer rings three times, and running light flashes at 6
times per 8 seconds. When the failure is confirmed, once there is feedback signal, the failure is
relieved automatic.
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