LG AC Thermostat Issues Repair in Chennai
A faulty thermostat misreads temperature, so the AC over- or under-cools.
LG Dual Inverter split ACs rely on precise thermistor feedback to modulate compressor frequency via the main PCB. When the indoor room temperature sensor or liquid tube sensor fails, the unit loses its ability to calculate the thermal load in your room. In Chennai's hot and humid climate, a faulty LG sensor forces the system into continuous cooling—freezing the indoor evaporator coil—or causes it to shut off prematurely, leaving your room warm and uncomfortable.
Common Symptoms of LG Thermostat & Sensor Malfunction- CH 01 or CH 02 Error Codes: LG indoor room temperature sensor or indoor pipe sensor circuit short/open errors displayed on the panel.
- Uncontrolled Continuous Cooling: The compressor runs at maximum capacity without throttling down, causing room temperatures to plunge far below your setting.
- Short-Cycling Compressor: The outdoor unit cuts off within 2–3 minutes of starting, leaving the fan blowing uncooled air.
- Evaporator Icing: Ice accumulation on the copper fins due to the compressor running uninterrupted when room load drops.
- Thermistor Resistance Drift: Corrosive coastal humidity in Chennai degrades the NTC (Negative Temperature Coefficient) thermistor, altering its baseline resistance values.
- Loose PCB Connector: Vibration or past servicing can loosen the 2-pin indoor sensor plug on the LG main control board.
- Capacitor/Circuit Noise on Indoor PCB: Voltage fluctuations can damage the sensor reading circuit on the controller board, leading to false temperature signals.
- Resistance Testing: We measure the room and pipe thermistors using a multimeter against LG's standard resistance-temperature charts (typically 10kΩ or 5kΩ at 25°C).
- PCB Diagnostic Check: We verify if the issue stems from the thermistor bead itself or the micro-controller processing circuit on the indoor PCB.
- Sensor Replacement: We replace faulty thermistors with original LG factory-calibrated sensor harnesses.
- System Calibration & Post-Test: We reassemble, clear fault codes, and test the auto-cut off function across various temperature settings.
Stop enduring uncomfortable room temperatures or risking compressor damage. Janani Cool Care provides fast, expert LG AC thermostat and thermistor repairs across Chennai with a 30-day service warranty. Call +91 99410 82878 now to schedule a technician visit.
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 Thermostat Issues on other brands
Frequently asked questions
What does a CH 01 or CH 02 error code mean on an LG AC?
These error codes indicate an open or short circuit in the indoor air temperature sensor (CH 01) or the evaporator pipe temperature sensor (CH 02). Replacing the faulty sensor harness resolves the issue.
How much does it cost to replace an LG AC temperature sensor in Chennai?
The cost typically includes a nominal inspection fee plus the price of an original LG sensor assembly and labor. Contact Janani Cool Care at +91 99410 82878 for an exact quote based on your specific model.
How long does it take to repair an LG AC thermostat or sensor?
A standard thermistor or sensor replacement on an LG split AC usually takes about 30 to 60 minutes, including diagnostic resistance testing and post-repair verification.
Does Janani Cool Care offer a warranty on AC repairs?
Yes, we provide a 30-day service warranty on all LG AC repairs and component replacements for complete peace of mind.