Sanyo CH1852 - Manual (Page 65)

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9-4. Air conditioner operates, but abnormalities are observed.
9-4-1. Operation does not switch from HEAT to COOL (or COOL to HEAT).
• Indoor PCB Ass'y is defective.
• Check voltage between terminals
No. 3(+) and No. 5 at terminal plate.
(DC 24V)
No voltage appears.
Outdoor PCB Ass'y is defective.
OK
• Remote control unit may be defective.
• Measure resistance of 4–way valve's
winding.
Receiver in lamp Ass'y may be
defective.
COOL ➞ HEAT
• Check voltage between terminals
No. 3(+) and No. 5 at terminal plate.
(0V)
HEAT ➞ COOL
000-111 SM (18-68) 00.3.17 11:49 AM y [ W 61