41
Installation and Maintenance
Service Manual
4. Water overflow protection E9
Malfunction diagnosis process:
Check whether
there is water
overflow
Whether the voltage
of drain pump terminal
is correct?
Whether the voltage
of liquid level switch
terminal is correct?
Replace the main board
of indoor unit
Replace the main board
of indoor unit
Check the wiring
of drain pump
Adjust the drain pipe
Check the liquid
level switch
Whether the drain
pump is running
Whether the drain pipe is cleared?
Water flow is smooth?
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
Error display
Check the drain
pump.
