• Defective AR22 relay
• Line breakage or poor contact on 7E
line or GND line of power box
terminal block 7C to AR22 coil 7E line
• MS
1 or MS2 solenoid switch is
defective.
• Line breakage or poor contact on MS1
or MS2 solenoid switch coil R3 or R4,
or S line (including )
Inspect and repair motor.
Is AR
1 or relay excited?
NO
YES
YES
BR line, wire breakage or poor
connector contact between
controller and relay box (AR
1)
Is 24V measured
at AR
1 coil BR line?
NO
YES
Defective controller
• Defective AR1 relay
• LR line breakage or poor connector
contact on the way of AR22 coil (7E) to
power box terminal block 7CE, 7C to
relay box AR1
Is 0.5V
or less measured at
terminal No.O of
controller?
NO
Is AR22 relay
excited?
NO
Is electromagnetic
switch MS1 or MS2
excited?
NO
YES
YES
Compressor does not run.
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