LG · Thermistor · Diagnosis
LG aircon thermistor repair in Singapore
LG aircon showing a temperature-sensor error, short cycling or an incorrect temperature reading? We test the thermistor, wiring and PCB input, explain what failed and quote only after diagnosis.
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Signs your LG aircon needs a thermistor check
These symptoms can involve a temperature sensor, but they can also come from its wiring, the control board, airflow or the refrigerant circuit.
A temperature-sensor error appears
A LG room, coil, pipe or outdoor sensor code identifies the circuit to test, not automatically the failed part.
The unit short cycles or runs continuously
An incorrect temperature signal can make the system stop too early, run longer than expected or struggle to hold the set temperature.
The temperature reading or icing looks unusual
A reading that does not match the room, repeated icing or unexpected protection can justify a sensor-circuit check.
Examples of LG systems we check
These are common examples, not a complete list. We also assess other LG systems after checking the indoor and outdoor model labels.
Dual Inverter S3-Q residential split systems
ArtCool and ArtCool Mirror wall-mounted systems
MU residential multi-split systems; Multi V scope confirmed from the exact model
Don't see your LG model?
Send photos of the indoor and outdoor model labels, plus the error code or a short video of the symptom. We'll confirm the right diagnostic starting point and thermistor service scope before arranging the visit.
It may not be the thermistor
Before ordering a model-specific sensor, we check three problems that can create the same code or temperature behaviour.
Loose connector or damaged wiring
An open, shorted or corroded sensor harness can produce the same reading as a failed thermistor.
PCB input fault
The sensor may measure correctly while the control board reads or processes its signal incorrectly.
Airflow or refrigerant condition
A restricted coil, icing or abnormal refrigerant condition can create temperature symptoms without a failed sensor.
LG error codes related to thermistor problems
Your LG error code helps us identify where to start. It does not prove that the thermistor needs replacement. Open the group that matches where the code appeared.
Indoor unit or controller9 guides
- CH01LG CH01 blinking light: indoor unit room temperature sensor error. What to record, what to send, and the checks that confirm it.
- CH02LG CH02 blinking light: indoor unit inlet pipe sensor error. What to record, what to send, and the checks that confirm it.
- CH06LG CH06 blinking light: indoor unit outlet pipe sensor error. What to record, what to send, and the checks that confirm it.
- CH08LG CH08: fan motor fault and sensor fault (mixed-source row). Which fault it is depends on your model, so check the table first.
- CH13LG Multi V 5 commercial VRF CH13: sensor fault. Which fault it is depends on your model, so check the table before booking a repair.
- CH16LG Multi V 5 commercial VRF CH16: sensor fault. Which fault it is depends on your model, so check the table before booking a repair.
- CH17LG Multi V 5 commercial VRF CH17: sensor fault. Which fault it is depends on your model, so check the table before booking a repair.
- CH18LG Multi V 5 commercial VRF CH18: sensor fault. Which fault it is depends on your model, so check the table before booking a repair.
- CH230LG Multi V 5 commercial VRF CH230: sensor fault. Which fault it is depends on your model, so check the table before booking a repair.
Outdoor unit19 guides
- CH40LG CH40 blinking light: CT sensor error. What to record, what to send us, and the checks a technician should confirm before you book a repair.
- CH41LG CH41 blinking light: inverter discharge pipe sensor is disconnected. What to record, what to send, and the checks that confirm it.
- CH42LG CH42: low pressure sensor fault (mixed-source row). What to record, what to send us, and the checks that confirm it before you book a repair.
- CH43LG CH43: high pressure sensor fault (mixed-source row). What to record, what to send us, and the checks that confirm it before you book a repair.
- CH44LG CH44 blinking light: outdoor air sensor is disconnected. What to record, what to send, and the checks that confirm it.
- CH45LG CH45 blinking light: middle thermistor of outdoor unit condenser coil is disconnected. What to record and the checks that confirm it.
- CH46LG CH46 blinking light: outdoor unit suction line thermistor is disconnected. What to record, what to send, and the checks that confirm it.
- CH47LG CH47: compressor discharge sensor fault (mixed-source row). What to record, what to send, and the checks that confirm it.
- CH49LG CH49: pcb / electrical fault and sensor fault (mixed-source row). Which fault it is depends on your model, so check the table first.
- CH65LG CH65 blinking light: heat sink thermistor has disconnected. What to record, what to send, and the checks that confirm it.
- CH71LG Multi V 5 commercial VRF CH71: sensor fault. Which fault it is depends on your model, so check the table before booking a repair.
- CH75LG Multi V 5 commercial VRF CH75: sensor fault. Which fault it is depends on your model, so check the table before booking a repair.
- CH113LG Multi V 5 commercial VRF CH113: sensor fault. Which fault it is depends on your model, so check the table before booking a repair.
- CH114LG Multi V 5 commercial VRF CH114: sensor fault. Which fault it is depends on your model, so check the table before booking a repair.
- CH115LG Multi V 5 commercial VRF CH115: sensor fault. Which fault it is depends on your model, so check the table before booking a repair.
- CH116LG Multi V 5 commercial VRF CH116: sensor fault. Which fault it is depends on your model, so check the table before booking a repair.
- CH153LG Multi V 5 commercial VRF CH153: sensor fault. Which fault it is depends on your model, so check the table before booking a repair.
- CH154LG Multi V 5 commercial VRF CH154: sensor fault. Which fault it is depends on your model, so check the table before booking a repair.
- CH194LG Multi V 5 commercial VRF CH194: sensor fault. Which fault it is depends on your model, so check the table before booking a repair.
Whole-system faults3 guides
- 201C + HR unit numberLG Multi V 5 commercial VRF 201C + HR unit number: sensor fault. Which fault it is depends on your model, so check the table first.
- 202C + HR unit numberLG Multi V 5 commercial VRF 202C + HR unit number: sensor fault. Which fault it is depends on your model, so check the table first.
- 203C + HR unit numberLG Multi V 5 commercial VRF 203C + HR unit number: sensor fault. Which fault it is depends on your model, so check the table first.
Codes that depend on the exact model5 guides
- 12LG 12 blinking light: sensor fault. What to record, what to send us, and the checks a technician should confirm before you book a repair.
- CH12LG CH12 blinking light: indoor unit middle pipe thermistor disconnected. Whether it is safe to keep running, and what to send before a repair.
- CH31LG CH31 blinking light: sensor fault and electrical fault. Which fault it is depends on your model, so check the table before booking a repair.
- CH48LG CH48 blinking light: outdoor unit coil outlet liquid-line thermistor is disconnected. What to record and the checks that confirm it.
- CH63LG CH63 blinking light: sensor fault and refrigerant / pressure fault. Which fault it is depends on your model, so check the table first.
Do not see your code here? Send a photo of the display and both model labels. LG codes can mean different things across model and system families.
What happens during a LG thermistor check
The aim is to give you a clear diagnosis and a sensible repair decision, not an automatic parts quote.
Send us the model and symptoms
Share the LG indoor and outdoor model numbers, any error code, which rooms are affected and what happened before the fault.
We test the likely causes
We match the code to the exact sensor circuit, inspect the connector and harness, measure the thermistor at the current temperature, and verify the PCB input.
You receive the finding and quote
We explain what failed, whether the correct part is available and whether repair or replacement is the better use of your money.
We repair and test the system
After approved work, we run the LG system through a full cycle and confirm that the original symptom or error has cleared.
Is LG thermistor repair worth it?
It depends on the confirmed fault, system age, parts availability and the condition of the rest of the aircon.
Parts and timing
The correct LG sensor is model- and location-specific. Indoor and outdoor thermistors are not assumed interchangeable; we confirm the model, sensor position, part number and distributor lead time before you approve work.
Our recommendation
Thermistor repair is usually a contained job when the sensor circuit is confirmed, the correct model-specific part is available and the rest of the system is healthy. LG systems commonly have a service life of 8–12 years. For a system over 10 years, major component failures favour replacement. Parts for older ArtCool models may be hard to source, and efficiency loss adds to the running cost of keeping the unit.
If replacement is the better option, we can compare the repair quote with a suitable new system instead of asking you to keep repairing an uneconomical unit. See our aircon system replacement process.
Why diagnosis matters on LG aircon
LG sensor codes can point to the thermistor, connector, harness or PCB input. Measuring the complete circuit helps avoid replacing a working sensor.
A LG thermistor fault we check carefully
LG sensor faults can sit at the indoor unit, outdoor unit or connected pipe circuit. We test the named sensor and wiring before treating the thermistor as failed.
Useful LG repair references
Workmanship warranty
We stand behind the repair we carry out, and we are straight about the part of the cover we do not set ourselves.
Labour
30-day labour warranty. If the same fault returns from the repair we did, we come back and the labour is on us, with no second diagnosis fee.
Parts
Parts follow whatever warranty the distributor sets for that component, so the term varies by part. We tell you the coverage before you approve the quote.
Frequently asked questions about LG thermistor repair in Singapore
What are the signs of a LG thermistor problem?
How do you confirm a LG thermistor fault?
Is a LG error code enough to order the thermistor?
Should I repair or replace my LG aircon?
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Tell us what’s going on. Symptoms, setup, photos, anything we should know. We’ll assess and come back with the right next step.