An AC that's running but not cooling is one of the most frustrating problems, especially during Delhi's scorching summers. Before you call a technician, understanding the possible causes can help you communicate the issue better and even try some quick fixes yourself. Here are the 10 most common reasons your AC is not cooling and how to fix them.
1. Low Refrigerant Gas
This is the most common cause of AC not cooling. Refrigerant (gas) is the substance that actually cools the air in your AC. Over time, small leaks can develop, causing the gas level to drop.
Symptoms: AC runs but air is not cold, ice formation on copper pipes, hissing sound.
Solution: Professional gas leak detection and refilling by Home Fixer technicians. We use R32/R410A gas as per manufacturer specs. Cost: ₹1,499.
2. Dirty Air Filters
Clogged air filters restrict airflow, reducing cooling efficiency by up to 15-20%. This is the easiest problem to fix.
Symptoms: Weak airflow from AC vents, AC running continuously without cooling the room.
Solution: Clean or replace air filters every month during peak summer. For thorough cleaning, book Home Fixer's AC deep cleaning service at ₹499.
3. Dirty Evaporator or Condenser Coils
Dirt and dust accumulation on coils prevents proper heat exchange, severely reducing cooling performance.
Symptoms: Reduced cooling over time, higher electricity bills, ice formation on indoor unit.
Solution: Professional coil cleaning using foam wash. Home Fixer's deep cleaning service covers both indoor and outdoor coil cleaning.
4. Faulty Compressor
The compressor is the heart of your AC. If it's not working properly, the AC won't cool regardless of other components.
Symptoms: AC turns on but doesn't cool, unusual humming or buzzing sound from outdoor unit, tripped circuit breaker.
Solution: Professional compressor diagnosis and repair. Home Fixer's experienced technicians can repair most compressor issues same-day.
5. Thermostat Issues
A malfunctioning thermostat can send wrong signals to the AC, causing cooling problems.
Symptoms: AC not reaching set temperature, erratic temperature changes, AC turning on/off frequently.
Solution: Thermostat recalibration or replacement. Home Fixer provides genuine thermostat replacement for all brands.
6. Blocked or Leaking Duct
In ducted AC systems, blocked or leaking ducts can cause significant cooling loss.
Solution: Professional duct inspection and repair. Home Fixer offers comprehensive duct cleaning and repair services.
7. Incorrect AC Size
An undersized AC will struggle to cool a large room, while an oversized AC will short-cycle without dehumidifying properly.
Solution: Consult with Home Fixer experts for proper AC sizing before installation. We help you choose the right capacity for your room.
8. Blocked Outdoor Unit
The outdoor unit needs proper airflow for heat dissipation. Blockages from furniture, plants, or debris can cause cooling issues.
Solution: Ensure at least 2 feet of clearance around the outdoor unit. Regular cleaning of outdoor unit fins.
9. Electrical Issues
Faulty wiring, capacitor failure, or PCB issues can prevent the AC from cooling properly.
Solution: Professional electrical diagnosis by Home Fixer's certified technicians. We check all electrical components during our comprehensive service.
10. Sensor Problems
The room temperature sensor, if faulty or displaced, can cause incorrect temperature readings.
Solution: Sensor repositioning or replacement. This is a quick fix that Home Fixer technicians handle during routine servicing.
When to Call a Professional
While some issues like dirty filters can be handled DIY, most AC cooling problems require professional attention. If you've tried basic troubleshooting and your AC still isn't cooling, it's time to call Home Fixer at 08851017494.
Our certified technicians arrive within 2 hours, diagnose the exact issue, and provide same-day repair with a 90-day warranty.
