Air-Con ABSCI4H4S09, Service Manual

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protective
The failure is detected when the room temperature sensor broken or shorted over 5 sec.
The failure is detected when the temperature sensor of heater exchange broken or shorted over 5 sec.
The failure is detected when each setting data is not match after the EEPPOM self-check two times.
The failure is occur when the grounding signal is not detected after the appliance power ON.
7-2. Test the jumper terminals
Note:
When the whole machine is powered up, if the external unit does not work, to rule out the
communications failures, adopt screening method such as short circuit on the jumper terminals to see if
the external unit can be started normally or similar method.
There are two blue terminals on the outdoor control panel, as shown above.
Application: Short out the terminals, and power up the outdoor unit, then the outdoor unit may run
independently. It can be determined that there is no internal and external communication faults.
7-3. Trouble Diagnosis of Protection
Protection diagnosis of the complete machine (all types of protection during operation, i.e.
under-voltage, over-voltage and overcurrent protection)
Note:
List all types of protection that may occur to the complete machine and describe the conditions
and signs of the start, course and end of such protection.
Voltage protection
Protection against AC input over-voltage/under-voltage