LG AUUQ54GH1 - Page 52

Part 4 Trouble Shooting
- 52 -
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Only for training and service purposes
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Check Point
1. Check the wire connection. (Open, Soldered poorly) ’ Repair the connection or change the PCB.
2. Check the resistance of float switch (Abnormal : Open, Normal : short) ’ Check the float switch.
3. Check the level of water
4. Check the volt. Of Drain pump power supply. (AC 230V) ’ Repair or Change the main PCB.
Check the wire
connection (Open,
Soldered poorly)
❊ Drain pump check
Check drain tube
installation
Is it normal ?
Check the level of
water (Float moves top
position)
Is it normal ?
Check the wire
connection (Open,
Soldered poorly)
Is the float
switch clean ?
Yes
Yes
No
Check Drain Pump
Yes
No
Correct connection
Or re-soldering PCB
Is the resistance of
Drain Pump? Normal
( about 400Ω ) ?
Yes
No
Change the Drain Pump
Is the drain
pump clean ?
Yes
No
Clean drain pump
No
Clean float switch
Is the resistance of f
loat switch normal
(short) ?
Yes
No
Change the float switch
Is it normal ?
No
Correct connection
Or re-soldering PCB
Check Flow Chart
CN-Float
CN-D/Pump
04
Drain pump
/ Float switch
• Float switch open.
(Normal : short)
• Water over flow
• The connection of wire (Drain pump/ Float switch)
• Drain pump power input. (220V)
• Drain tube installation.
• Indoor unit installation. (Inclination)
Display
code
Title Cause of error Check point & Normal condition