Air Conditioner Does Not Operate - Sanyo CH0951 Technical & Service Manual

9-2. Air conditioner does not operate.

9-2-1. Circuit breaker trips (or fuse blows).
A. When the circuit breaker is set to ON, it is tripped soon. (Resetting is not possible.)
There is a possibility of ground fault.
Check insulation resistance.
If resistance value is 2M½ or less, insulation is defective ("NO").
WARNING
*
Set circuit breaker to OFF.
1 Remove both power supply wires
and inter-unit wires from terminal
plate in outdoor unit.
Measure insulation resistance
•
of outdoor unit.
2 Remove inter-unit wires from
terminal plate in indoor unit.
Measure insulation resistance
•
of indoor unit.
2 1
Indoor Outdoor
Inter–unit
unit unit
wiring
1 1 8
2 2 7
3 3
4 4
5 5
6 6
G G G
NO
NO
55
1
Power supply
wiring
L2
Power
Circuit
L1
supply
breaker
Ground
Insulation of
outdoor unit
is defective.
Measure insulation
•
resistance of electrical
parts in outdoor unit.
Insulation of
indoor unit
is defective.
Measure insulation
•
resistance of electrical
parts in indoor unit.