5-4. Air conditioner operates, but abnormalities are observed
5-4-1. Operation does not switch from HEAT to COOL (or COOL to HEAT)
Remote control unit
Receiver in lamp ass'y
may be defective
may be defective
Measure resistance of
4-way valve's winding (20S)
COOL to HEAT
Check voltage between terminals
Outdoor PCB ass'y is defective
N°4(+) N°6 at terminal plate
(DC 24V)
Indoor PCB ass'y is defective
HEAT to COOL
Check voltage between terminals
N°4(+) N°6 at terminal plate
(0V)
OK
No voltage appears
25
Summary of Contents for 387106951
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Page 10: ...2 DIMENSIONAL DATA Units mm 10...
Page 11: ...3 ELECTRICAL DATA 3 1 Electric Wiring Diagrams 11...
