Sanyo KHS1852-S, CH1852, CH0952 service manual Cool Heat, Heat Cool

9-4. Air conditioner operates, but abnormalities are observed.

9-4-1. Operation does not switch from HEAT to COOL (or COOL to HEAT).

• Remote control unit may be defective.

Receiver in lamp Ass'y may be defective.

•Measure resistance of 4–way valve's winding.

COOL ➞ HEAT

•Check voltage between terminals No. 3(+) and No. 5 at terminal plate.

(DC 24V)

OK

Outdoor PCB Ass'y is defective.

No voltage appears.

• Indoor PCB Ass'y is defective.

HEAT ➞ COOL

•Check voltage between terminals No. 3(+) and No. 5 at terminal plate.

(0V)

61