The room is not cooled at all
or not cooled.
The compressor does not operate.
Measure resistances of TH1 and TH2.
Push the "TEST" and "AUX" on
the indoor unit.
The room is not heated at all or not heated.
The compressor does not operate.
Same as "The room is not cooled
at all or not cooled.
Refer to trouble suspension table.
Is the 3A fuse down ?
Replace the fuse and varistor
with new ones.
NO
NO
YES
Replace the transformer
with a new one.
YES
Three LEDs are all lit.
Is the measured value
approx. 16.0Vac ?
Replace the PWB
with a new one.
Using a tester, measure the
voltage between terminal"1" and
"2" of connector CN2 on the
P.W.B. ass'y.
Measure the secondary
voltage of transformer.
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