Friedrich MRM09Y1J, Service & Parts Manual

Page: 98 / 135

98 PB
TROUBLESHOOTING
Malfunction of Power Supply from Indoor to Outdoor Unit
Y
Y
N
N
Y
N
Energize the unit
and wait for 3min
Voltage > 200V?
Measure voltage between
N 1and 3 of indoor
wiring block
Measure voltage
between L and N
of outdoor wiring
block
Normal wiring?
Voltage > 200V?
Indoor main board error
Adjust wiring
Outdoor electric
box error
indoor and outdoor
wiring error
Replace main board
of indoor unit
Replace outdoor
electric box
Replace indoor
and outdoor wiring
Remove malfunction
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