LG AC Sensor Problem Repair in Chennai
A defective temperature/room sensor makes the AC cycle wrongly or ignore the remote.
When an LG Dual Inverter or split air conditioner experiences sensor drift or open-circuit failure, the Indoor Unit (IDU) loses its ability to sample ambient room temperature accurately. Instead of maintaining your set temperature, the compressor may run continuously—turning your bedroom into an icebox—or shut down prematurely before cooling the room. On LG systems, a faulty room thermistor or coil sensor often triggers specific diagnostic error codes like CH 01 or CH 02 on the front display.
Common Symptoms of LG AC Sensor Failure- Error Codes CH 01 or CH 02: Displays on the indoor panel or blinks via the LED indicator, signaling a room thermistor or evaporator pipe sensor fault.
- Continuous Cooling Without Cut-off: The AC keeps running at maximum capacity despite reaching the target temperature set on the LG Magic Remote.
- Short-Cycling Compressor: The outdoor unit trips off after a few minutes and turns back on abruptly, failing to complete a cooling cycle.
- Unresponsive Auto Mode: Switching to AI Convertible or Auto mode causes the fan speed to fluctuate wildly or freeze entirely.
- Sensor Resistance Drift: Heat, moisture, and high coastal humidity in Chennai cause the thermistor's 10k ohm resistance value to shift outside normal operating tolerances.
- Evaporator Coil Corrosion: Corrosion near the copper sleeve holding the liquid line sensor degrades thermal conductivity or corrodes the sensor wire harness.
- PCB Connector Degradation: Dust accumulation and moisture ingress on the indoor PCB header pins cause voltage fluctuations to the sensor circuit.
- Pest Damage: Rodents or insects chewing through the thin sensor wiring inside the indoor unit casing.
- Diagnostic Resistance Testing: Our technicians measure the precise resistance (in kOhms) of both the room air sensor and evaporator pipe sensor using a digital multimeter against LG factory specifications.
- PCB Port Inspection: We check the indoor mainboard terminals for loose contacts, corrosion, or burnt tracks before replacing components.
- Genuine Thermistor Replacement: We replace degraded sensors with original OEM-spec sensor harnesses matching your specific LG model series.
- System Recalibration & Testing: After installation, we clear error logs and test room temperature cut-off cycles across cooling modes.
If your LG AC is displaying CH 01 error or failing to maintain room temperature in Chennai, contact Janani Cool Care today. Call +91 99410 82878 to book an expert technician with a 30-day service warranty.
How Janani Cool Care fixes it
Book online or call
Pick your service, choose a date and time slot, and share your address. We confirm the slot within 15 minutes.
Technician arrives
A verified technician reaches your doorstep at the scheduled time — you are notified when they are on the way.
Diagnosis & transparent quote
The technician inspects the appliance, explains the issue, and shares upfront pricing before any work begins.
Service performed
Work is carried out on the spot wherever possible, using proper tools and genuine spares.
Performance check
The appliance is tested after service to confirm everything works as expected before the technician leaves.
Invoice & 30-day warranty
You get a digital invoice, and your 30-day service warranty starts from the service date.
AC Sensor Problem on other brands
Frequently asked questions
What does error CH 01 or CH 02 mean on an LG AC?
Error CH 01 indicates an open or short circuit in the indoor room temperature sensor, while CH 02 signals a fault in the indoor coil pipe temperature sensor. Both require inspecting or replacing the sensor harness.
Can I replace the LG AC thermistor myself?
DIY replacement is not recommended because testing requires a multimeter to verify ohm resistance, and incorrect installation or handling of the indoor PCB connector can short out the electronic controller.
How long does an LG AC sensor replacement take?
Once our technician arrives with the correct OEM-spec thermistor assembly, testing and replacing the sensor usually takes around 30 to 45 minutes.
Does Janani Cool Care offer a warranty on sensor repairs?
Yes, all sensor replacement and PCB repairs provided by Janani Cool Care come with a 30-day service warranty for your peace of mind.