1
LG 1 Error Code – Indoor Return Air Thermistor Error
Air Conditioner · HIGH Severity
What This Error Means
Indoor unit return air thermistor has disconnected or shorted out
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 Return Air Thermistor
Find thermistor at indoor unit air return.
Find thermistor at indoor unit air return.
INSPECT
~10 min
3
Check Thermistor Connection
Disconnect and reconnect. Check for corrosion.
Disconnect and reconnect. Check for corrosion.
CHECK
~5 min
4
Measure Thermistor Resistance
Compare to service manual spec. Replace if open or shorted. ⚠️ Disconnect power first
Compare to service manual spec. Replace if open or shorted. ⚠️ Disconnect power first
TEST
~15 min
5
Replace Thermistor
Order replacement thermistor using model number LSN091HSV.
Order replacement thermistor using model number LSN091HSV.
REPLACE
~20 min
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