Troubleshooting Guide

Troubleshooting 29
Indoor / outdoor units communication error
Start: Power off , then Power on the
A/C by the Breaker reconnect the
power wire). Is it still displaying the
error code ?
Yes
No
Replace outdoor main PCB
assembly (include wiring) totally
Check wiring on the outdoor and
indoor terminal follow the wiring
diagram. Is all connecting correctly?
Yes
No
Measure Volts, is it moving
alternately between positive
value and negative value? (Volts is
the voltage between S and N).
Turn on all indoor units by remote
controller. Is all indoor unit
display the same?
Turn off the all indoor units
.
Is IPM
power, LED, or operating LED lamp
On?
Yes
A: Is all the wiring
between terminal and
Indoor PCB connect ok?
No
Yes
A
No
Reconnect the wiring
Is indoor units number correct?
Check on the outdoor check point (2 for
dual zone, 3 for 3-zone, 4 for 4-zone,
5 for 5-zone).
Yes
No first time
Yes
Yes
Replace the Indoor PCB
Power on by remote
controller, I
Is it still
displaying the error code
after 3 minutes?
Problem is solved
No second time
No
Yes
Reconnect the wiring
No
Replace IPM board or the
outdoor main PCB
No
Is the reactor connecting
well
No Reconnect the wiring
Replace the outdoor main
PCB
Yes
No
Is main board“ ”
lamp on? .