Friedrich MR09C1H Service Manual

9.4 How to Check simply the main part
Troubleshooting
N
Y
N
Y
N
Y
N
Y
N
Y
Switch on the unit
and wait 1 minute
Use DC voltmeter
to measure the
voltage on the two
ends of electrolytic
capacitor (test3)
Fault with the
voltage testing
circuit on contr-
ol panel AP1
Replace the
control panel
AP1
Measure the AC voltage between
terminal L and N on wiring board
XT
Switch off the
power and repair
the supply power
to restore the volt-
age to 103.5~126.5
VVAC
For 115V
Units
Re-energize
and switch
on the unit
If the fault is
eliminated?
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?
Connect the rea-
ctor L according to
Electrical Wiring
Diagram
Re-energize
and switch on
the unit
If the fault
is eliminated?
End
Replace the control
panel AP1
Voltage within 103.5~126.5V?
For 115V Units
Voltage higher than 103.5V?
For 115V Units
Voltage higher than 187V?
For 208~230V Units
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:
52

Friedrich MR09C1H Specifications

General

Brand	Friedrich
Model	MR09C1H
Category	Air Conditioner
Language	English