Troubleshooting
Electrical Control System 207
2.4.2.3. E2 malfunction(Only for 12k)
Indoor / outdoor units communication error
E2 display
Yes
Power off, then turn on the unit 5
seconds later(reconnect the power
wire).Is the error still displaying
after several minutes?
Yes
Yes
Yes
Change the indoor main PCB.
Power on. Is the error extinguished?
Change the indoor main PCB.
No
Change the outdoor main PCB.
No
Check all the wirings between
indoor and outdoor, indoor PCB
and outdoor PCB following the
wiring diagram. Are all the
wirings connected correctly?
Measure Vs, is it moving
alternately between positive
value and negative value?
(Vs is the voltage between S
and N of outdoor unit.)
Is the wiring to the outdoor
PCB connected correctly?
Is the wiring to the indoor PCB
connected correctly?
No
Change the outdoor main PCB.
Yes
Power on. Is the error extinguished?
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