8-4-1. Malfunction of power supply from indoor unit to outdoor unit
8-4. How to check the main part
< Main Inspection Points >
Inspect the power supply plug seat with AC voltage gauge to check if the voltage between L and N is within
200VAC to 240VAC.
Check with AC voltage gauge if the voltage between N1 and 3 of indoor wiring block is within 200VAC to 240VAC.
Check with AC voltage gauge if the voltage between L and N outdoor wiring block is within 200VAC to 240VAC.
< Malfunction Diagnosis Process >
Energize the unit and
wait for 3 min.
Remove malfunction.
Indoor main board error
Adjust wiring.
Measure voltage between
L and N of
outdoor wiring block.
Replace main board of
indoor unit.
Outdoor electric box error
Replace outdoor
electric box.
Indoor and outdoor
wiring error
Replace indoor and
outdoor wiring.
Measure voltage between
N1 and 3 of
indoor wiring block.
Voltage > 200V ?
Yes
No
Yes
No
Yes
No
Normal wiring ?
Voltage > 200V ?
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