LG AC Slow Cooling Repair in Chennai
Cooling is noticeably slower than usual and the AC struggles to hold the set temperature.
LG split and window ACs, especially Dual Inverter models, rely on precise sensor communication and continuous variable-speed compressor adjustments to maintain target temperatures. When cooling becomes noticeably sluggish or the unit continuously runs without reaching the set temperature, the issue often stems from micro-refrigerant leaks, obstructed heat exchangers, or miscalibrated sensor feedback. In Chennai's humid coastal environment, corrosion on the outdoor condenser fins can drastically impair thermal radiation, forcing your LG unit to run inefficiently.
Common Symptoms of LG AC Slow Cooling- The room takes over 45 minutes to drop by even a few degrees.
- Airflow from the indoor unit feels lukewarm or moderately cool rather than crisp.
- The outdoor compressor unit runs continuously without ramping down or cycling off.
- Displaying CH38 error codes or flickering indicator lights indicating low refrigerant pressure.
- Ice formation along the thin liquid line brass valves on the outdoor unit.
- R32 / R410A Gas Leakage: Micro-fractures in the evaporator copper coils or outdoor flare joints cause gradual pressure loss.
- Clogged Ocean-Breeze / Dust Filter: Accumulated fine dust restricts intake airflow, bottlenecking the cooling cycle.
- Corroded Condenser Coils: Salt air in coastal Chennai causes oxidation on the outdoor unit fins, preventing heat dissipation.
- Faulty Room / Evaporator Thermistor: Defective thermistors send incorrect resistance values to the main PCB, limiting compressor output speed.
- Weak Compressor Run Capacitor: Reduced capacitance prevents the compressor motor from reaching full operational RPM.
- Digital Operating Pressure & Ampere Check: Our technicians measure standing and suction pressure of R32/R410A gas along with compressor current draw.
- Nitrogen Leak Detection & Brazing: We isolate coil micro-leaks, perform precision copper brazing, and pull a full vacuum before controlled gas charging.
- Chemical Foam Jet Cleaning: Deep pressure washing of indoor evaporator coils and outdoor condenser fins to restore optimum heat exchange.
- Sensor Resistance Testing: Checking LG room and tube sensors using a multimeter against factory resistance charts, replacing faulty thermistors with genuine parts.
- Post-Service Performance Validation: Verifying delta-T (temperature difference between return and supply air) to ensure rapid, optimal cooling.
Stop letting a struggling air conditioner drive up your electricity bills. Janani Cool Care provides rapid, reliable LG AC diagnostics across Chennai with transparent pricing and a 30-day service warranty. Call +91 99410 82878 today 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 Slow Cooling on other brands
Frequently asked questions
Why is my LG Dual Inverter AC taking a long time to cool the room?
Slow cooling on LG inverter models is usually caused by choked air filters, dirty condenser fins, a slight refrigerant leak, or a faulty thermistor restricting compressor speed.
How long does it take to repair an LG AC slow cooling issue?
A standard chemical jet cleaning and filter service takes about 45–60 minutes. If a gas leak requires copper brazing and vacuum gas charging, it typically takes 2 to 3 hours.
How much does it cost to fix slow cooling in an LG AC in Chennai?
Basic inspection and filter cleaning cost a nominal visit fee, while chemical jet cleaning or gas leak repair with refilling varies based on the gas type (R32/R410A) and scope of work required.
Does Janani Cool Care offer a warranty on AC repair work?
Yes, we provide a 30-day service warranty on all labor and repairs carried out by our qualified technicians.