How To Check Simply The Main Part - Friedrich MW09C1H Service Manual

9.4 How to Check simply the main part

Main Check Points:
Units of 115V: Use AC voltmeter to check wether the voltage between terminal L and N on the wiring board is 115V AC
Units of 115V: Whether the reactor ( L) is correctly connected? Whether the connection is loose or fallen? Whether the reactor
(L) is damaged ?
Fault diagnosis process:
Switch on the unit
and wait 1 minute
Use DC voltmeter
to measure the
voltage on the two
ends of electrolytic
capacitor (test3)
Voltage higher than 103.5V?
For 115V Units
Voltage higher than 187V?
For 208~230V Units
Measure the AC voltage between
terminal L and N on wiring board
XT
Voltage within 103.5~126.5V?
For 115V Units
Switch off the power and wait 20 minutes;
or use DC voltmeter to measure the volt-
age on the use DC voltmeter to measure
the voltage on the two ends of capacitor
(test3), until the voltage is lower than 20V
Check the
connection of reactor
(L in the Electrical
Wiring Diagram)
If the wiring of
reactor L is normal?
Replace the control
panel AP1
52
Fault with the
voltage testing
Y
circuit on contr-
ol panel AP1
N
Switch off the
power and repair
the supply power
N to restore the volt-
age to 103.5~126.5
VVAC For 115V
Units
Y
Connect the rea-
ctor L according to
N
Electrical Wiring
Diagram
Y
End
Replace the
control panel
AP1
Re-energize
If the fault is
and switch
eliminated?
on the unit
N
Re-energize
If the fault
and switch on
is eliminated?
the unit
N
Troubleshooting
Y
Y