LG aircon indoor thermistor repair in Singapore
A LG room, coil or pipe sensor code can mean a failed thermistor, a connector or harness fault, or a genuinely abnormal temperature. We test the thermistor, connector, harness and indoor-PCB input, explain what failed and quote after diagnosis.
BCA-registered10,000+ jobs completed
Signs your LG aircon needs an indoor-thermistor check
These symptoms can involve an indoor temperature sensor, but they can also come from its connector, harness, indoor PCB, airflow or a genuine coil-temperature condition.
A room, coil or indoor pipe sensor code appears
A LG indoor-sensor code identifies the circuit to test.The unit short cycles or reads the room incorrectly
An incorrect air-temperature signal can make the unit stop too early, run too long or fail to hold the set temperature.The indoor coil ices or behaves abnormally
A coil or pipe sensor may be involved, but airflow, fan and refrigerant conditions must be checked at the same time.
Examples of LG systems we check
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
Model not listed
Send photos of the indoor and outdoor model labels, plus the error code or a short video of the symptom.
It may not be the indoor thermistor
Before ordering a model-specific indoor sensor, we check three problems that can create the same code, icing or temperature behaviour.
Connector or harness fault
A loose, corroded, open or shorted sensor wire can produce the same electrical reading as a failed thermistor.Indoor-PCB input fault
The sensor may measure correctly while the indoor control board reads or processes the signal incorrectly.Airflow, icing or refrigerant condition
The thermistor may be reporting a genuine abnormal coil or pipe temperature caused by a fan, airflow or refrigerant problem.
We match the code to the exact indoor room, air, coil or pipe temperature circuit, inspect the connector and harness, measure the thermistor at the current temperature, and verify the indoor-PCB input. How a job runs, from first message to booking.
What is different on LG systems
LG manufacturer fault tables list 2 codes for indoor thermistor faults, among them CH01, CH02.
LG error codes related to indoor thermistor problems
Open the group that matches where the code appeared on your unit.
Codes can mean different things across model and system families. Every code is in the full lookup for this brand. Last reviewed 2026-08-23.
Is LG indoor thermistor repair worth it?
Parts and timing
The correct LG indoor room, air, coil or pipe thermistor is model- and location-specific. We confirm the indoor model, sensor position, connector, part number and distributor lead time before you approve work.Our recommendation
Indoor-thermistor repair is usually a contained job when the exact room, air, coil or pipe sensor circuit is confirmed, the correct model-specific part is available, and the indoor PCB and refrigerant system remain 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 makes more sense, we compare the repair quote with a suitable new system. See our aircon system replacement process.
Other LG repair checks
If testing rules out this part, these are the next checks on the same system.
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 workmanship warranty. If the same fault returns from our repair, we come back and the labour is on us, with no second diagnostic visit fee.
Parts
Parts carry the distributor's warranty for that component, so the term varies by part. We tell you both terms before you approve the work.
Frequently asked questions about LG indoor thermistor repair in Singapore
What are the signs of a LG indoor thermistor problem?
How do you confirm a LG indoor thermistor fault?
Does a LG indoor-sensor code prove the thermistor has failed?
Should I repair or replace my LG aircon?
We cover all of Singapore. Find aircon services in your area.
Describe your situation
Tell us what’s going on. Symptoms, setup, photos, anything we should know. We’ll assess and come back with the right next step.