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TROUBLESHOOTING GUIDE OF CONTROL CIRCUIT
Note : Do not check two indoor units at the same time. Be sure to check them one by one.
The machine does not function
at all with remote control and
switches on the indoor unit.
Power supply
between "L" and "N" of
terminal board ?
YES
Using a tester, measure the
voltage between terminal " 1 "
and " 2 " of connector CN2 on
P.W.B. ass'y.
Is the measured value
approx. 16.0 Vac ?
YES
Replace the indoor P.W.B. ass'y
with a new one.
NO
Replace the transformer
with a new one.
Measure the secondary
voltage of transformer.
None of three LEDs is ON.
NO
Is the unit to unit cord
correctly connected ?
Is the 3A fuse down ?
YES
Replace the fuse and
varistor with new ones.
21
NO
YES
Using a tester measure the
voltage between "L" and "N"
of terminal board on the
outdoor unit.
Check the electric circuit on
the outdoor unit.
AY-M09AE
AE-M18AE
Connect the unit to
unit cord correctly.
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