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2. Keystroke circuit error diagnose:
When power on for the first time, the PCB will check the keystroke circuit, is the sampling value is defferent
with the theory value, the LED will show E1, which means failed keystroke circuit. The keyboard is locked and
so invalid, but the remote control is working normally.
Check whether the keystroke can't
get up with prssure.
Repair the keystrokes on electrical
box to keep them away from the
keystrokes on PCB.
ESA412K
YES
NO
PCB is broken, replace a new PCB.
19
Abnormity Diagnose
Domestic Air Conditioner
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