42
3.8.
EE Troubleshooting
3.8.1.
Display output
or
ALARM LED
flashes
twice per
second
3.8.2.
Description
▪
Water level error.
3.8.3.
Impact on other units
▪
3.8.4.
Possible causes
▪
Water level float stuck.
▪
Water level switch not connected properly.
▪
Damaged main PCB.
▪
Drain pump has malfunctioned.
3.8.5.
Procedure
EE
The water level float is stuck
Yes
Inspect the float and repair it
No
Water level switch connection on
main PCB has short circuited or
disconnected
1
Yes
Ensure the switch is connected
properly
No
The power supply to the drain pump
is abnormal
2
Yes
Replace indoor main PCB
No
The drain pump motor has
malfunctioned
3
Yes
Replace the drain pump
Notes:
1.
The water level switch connection port on each type of indoor unit main PCB is labeled in Figures 1.1 to 1.19 in
1,
“
Main PCB Ports
”
.
2.
Measure the voltage between the two pins of the drain pump connection on the indoor unit main PCB. The normal voltage range is 220 to 240 V (AC).
The drain pump connection port on each type of indoor unit main PCB is labeled in Figures 1.1 to 1.19 in
1,
“
Main PCB Ports
”
.
3.
Measure the resistance between the two power supply terminals on the drain pump motor. If the resistance is either zero or infinite, the motor has
malfunctioned.
