31
LG 31 Error Code – CT Thermistor Current Too Low
Air Conditioner · HIGH Severity
What This Error Means
Current to the current transformer (CT) thermistor is too low
Diagnostic & Repair Steps
1
Power Reset
Turn off at breaker, wait 5 min, restart.
Turn off at breaker, wait 5 min, restart.
RESET
~5 min
2
Locate CT Thermistor
Find current transformer thermistor on outdoor PCB.
Find current transformer thermistor on outdoor PCB.
INSPECT
~10 min
3
Check Thermistor Connection
Disconnect and reconnect.
Disconnect and reconnect.
CHECK
~5 min
4
Test Thermistor
Replace if current signal too low. ⚠️ Disconnect power first
Replace if current signal too low. ⚠️ Disconnect power first
TEST
~15 min
5
Refer to LG Service Manual
Visit www.lg-dfs.com for detailed troubleshooting.
Visit www.lg-dfs.com for detailed troubleshooting.
CHECK
~10 min
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