Malfunction Of Power Supply From Indoor To Outdoor Unit - Friedrich MWM09Y1J Service & Parts Manual

TROUBLESHOOTING

Malfunction of Power Supply from Indoor to Outdoor Unit

Inspect the power supply plug seat wit hAC voltage guage to check if voltage between L and N is within 200VAC-240 VAC.
Check with AC voltage gauge if the voltage between N1 and 3 of indoor wiring block is within 200 VAC-240AC
Energize the unit
and wait for 3min
Measure voltage between
N 1and 3 of indoor
wiring block
Voltage > 200V?
N
Normal wiring?
Y
Indoor main board error
Replace main board
of indoor unit
98
Measure voltage
between L and N
Y
of outdoor wiring
block
N
Adjust wiring
Remove malfunction
Voltage > 200V?
Y
Outdoor electric
box error
Replace outdoor
electric box
N
indoor and outdoor
wiring error
Replace indoor
and outdoor wiring