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One of indoor unit works normally.
but one of indoor unit has no
response to signals of remote
controller.
One of indoor unit works as cooling or
dehumidific
ation mode. Another one indoor
unit can’t work as heating mode. The mean is
that the indoor unit with heating mode
couldn’t receive single from remote controller.
2. No power supply（out of
work completely）-tentative diagnosis
2.1. Check item
1) Does the input voltage is correct？
2) Does AC power wires connected correctly？
3) Does the output voltage of voltage stabilizer l7805 (ic2) is correct？
4) Does between indoor and outdoor unit communication is normal？
2.2. Fault diagnosis procedure
Note：There is according with an outdoor unit and two indoor unit. and a set of PCB. Please
check them accordingly.
1 Unplug the indoors and outdoors and re-plug after about 5 seconds
2 Listen if noise from buzzer or not?
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