ESIE16-02K
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Part 2. Troubleshooting
2.3. Symptom based troubleshooting
31/05/21
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Version 1.1
Page 47
RA R32 Split & multi split M-Series
In heating mode
2.3.8. Indoor fan starts operating but the compressor does not operate
Is there clogging before or after the expansion valve (capillary)?
Check if there is a temperature difference before and after
expansion valve (capillary).
Check if the main valve unit of expansion valve operates (by
noise, vibration).
Is the check valve (if applicable) clogged?
after check valve. If YES, the check valve is caught.
Is there a shortage of refrigerant?
Conduct refrigerant collection and vacuum drying, and then add
proper amount refrigerant.
Check item
Detail
Does the outdoor unit fan run normally?
Visual inspection
Is the outdoor unit heat exchanger clogged?
Visual inspection
Is there clogging before or after the expansion valve (capillary)?
Check if there is a temperature difference before and after
expansion valve (capillary).
Check if the main valve unit of expansion valve operates (by
noise, vibration).
Is the check valve (if applicable) clogged?
Check if there is a temperature difference before and after check
valve. If YES, the check valve is caught.
Is the outdoor unit installed under such conditions that short cir-
cuit easily occurs?
Visual inspection
Is there a shortage of refrigerant?
Conduct refrigerant collection and vacuum drying, and then add
proper amount refrigerant.
Check
Detail
Check the power supply.
Is the rated voltage (± 10%) supplied?
Check the insulation of the electric system.
Check the thermistor.
Connection witch PCB.
Output.
Check PCB's HAP LED's (if applicable).
If green led on the control PCB is not blinking, then the micropro-
cessor is not working.
If the green led on the main PCB is not blinking, then the micro-
processor is not working.
If first green LED on the service monitor PCB is not blinking, then
the microprocessor is not working.
Check the magnetic switch.
Check the power transistor.
Check the compressor.
Defective contact.
Defective compressor.
Defective protection thermostat.
Check the outdoor temperature.
Heating operation cannot be used when the outdoor temperature
is 18°C WB or higher.
Cooling operation cannot be used when the outdoor temperature
is below 10°C DB.
Check item
Detail