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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
may be defective
Measure resistance of
4-way valve's winding (20S)
COOL to HEAT
Check voltage between terminals
N°3(+) N°5 at terminal plate
No voltage appears
Indoor PCB ass'y is defective
HEAT to COOL
Check voltage between terminals
N°3(+) N°5 at terminal plate
CAUTION
If the units are operated in different modes (for example, unit A in the heating mode and unit B
in the cooling or drying mode), the results are as follows.
(Example) Unit A in heating mode
Unit B in cooling or drying mode
If unit A is stopped, unit B will switch to cooling or drying operation.
OK
(DC 24V)
(0V)
Units A and B cannot be operated in different modes simultaneously
(for example, unit A operating in the heating mode while unit B is operating
in the cooling or drying mode). When operating two units at the same time,
set them both to the same mode. Note however that though technically
different modes, unit A can operate in the cooling mode while unit B
is operating in the drying mode.
Receiver in lamp ass'y
may be defective
Outdoor PCB ass'y is defective
Unit A in heating mode
(Heating operation takes precedence)
Unit B fan operating
23
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