Sanyo KHS1852-S, CH1852 Air conditioner does not operate, Circuit breaker trips or fuse blows

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”).

Indoor

unit

1

2

3

4

5

6

G

21

Inter–unit wiring

Outdoor

unit

18

27

G G

1

Power supply wiring

L2

L1

Ground

Circuit breaker

Power supply

WARNING

*Set circuit breaker to OFF.

1Remove both power supply wires and inter-unit wires from terminal plate in outdoor unit.

•Measure insulation resistance of outdoor unit.

2Remove inter-unit wires from terminal plate in indoor unit.

•Measure insulation resistance of indoor unit.

NO

NO

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.

55