81
Heating mode is preferred. Select
non-preferred mode (cooling) or operation
mode, which is different from selection
way of switch setting.
The abnormity of Indoor unit
Indoor unit PCB board is in bad condition;
Wired controller is in bad condition.
Normal
No
Yes
*2
Whether there
is AC15V voltage
between terminal blocks
A and B of wired
controller
Whether there
is AC15V voltage
between terminal blocks A
and B of indoor unit
Whether there
is AC220V voltage
between terminal blocks L
and N of indoor unit
Whether the LED (green and red) on control
base board of the indoor unit is
Whether the fuse of
indoor unit PCB board is
normal
Check the power
supply wire of indoor
unit
The transformer of Indoor unit is in bad condition;
Wires around the PCB board of indoor unit are broken
and the insertion of socket is poor.
The transformer of Indoor unit is in bad condition;
The PCB board of Indoor unit is in bad condition.
PCB board in wired controller is in bad condition;
Wires around the PCB board of indoor unit are broken
and the insertion of socket is poor.
Wrong connection between indoor unit and wired
controller
Find the cause of the fuse burnout
*3
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Voltage
Voltage
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