Mitsubishi aircon not cold
A Mitsubishi aircon not cold is one of the most common problems faced by homeowners in Singapore. When the unit is running but the room still feels warm, it usually means something inside the system is not working efficiently.
At Letscool Aircon, we handle Mitsubishi aircon cooling issues daily, and in most cases, the problem can be fixed if diagnosed early.
Below are the real reasons why your Mitsubishi aircon may not be cooling properly.
Refer: Aircon Servicing Singapore
1. Dirty Air Filters Blocking Airflow
Air filters trap dust, dirt, and pollutants. When they are clogged, cold air cannot flow smoothly into your room.
Common signs:
- Weak airflow
- Air feels slightly cool but not strong
- Higher electricity usage
🛠 Cleaning your filters every 2–4 weeks is essential in Singapore’s dusty and humid environment.
2. Fan Coil Unit Is Dirty Inside
Even if filters are clean, dust and mould can build up deep inside the fan coil unit.
What happens:
- Cooling becomes slow
- Air smells unpleasant
- Water leakage may occur
✅ Regular professional air conditioning servicing is needed to fully clean internal components.
3. Low Refrigerant (Gas) Level
If your Mitsubishi aircon blows air but never becomes cold, low gas pressure is a major cause.
Reasons gas becomes low:
- Refrigerant leakage
- Poor installation
- Old copper piping
⚠ Simply topping up gas without fixing leaks will cause the problem to return.
4. Outdoor Condenser Is Dirty or Overheating
The outdoor unit releases heat from your room. When it is dirty or blocked, heat cannot escape properly.
Result:
- Poor cooling performance
- Aircon feels warm during the daytime
- System strains and uses more power
Refer: Aircon not cold
🔧 Condenser cleaning or chemical wash restores proper heat release.
5. Faulty Thermostat or Sensor
If the temperature sensor is faulty, your aircon may think the room is already cold and reduce cooling.
Symptoms:
- Aircon stops cooling too soon
- Inconsistent room temperature
- Cooling works only intermittently
Professional inspection is required to recalibrate or replace sensors.
Refer: Aircon Repair
6. Electrical Component Issues
Mitsubishi aircon units rely on components like capacitors and PCB boards.
Possible problems include:
- Aircon turns on but does not cool
- Blinking lights or error codes
- Sudden shutdowns
⚡ These issues should only be handled by trained technicians to avoid further damage.
7. Incorrect Aircon Size for the Room
An aircon that is too small for your room will never cool efficiently.
Common mistakes:
- Low BTU unit for large rooms
- One indoor unit serving multiple spaces
📐 A proper site survey ensures correct aircon capacity for your space.
8. Poor or Aging Installation Piping
Old or badly installed copper piping can cause gas leaks and cooling loss.
Signs:
- Repeated gas top-ups
- Cooling improves briefly then fails again
Replacing old piping can permanently solve recurring cooling issues.
9. Lack of Regular Maintenance
Without regular servicing:
- Dust builds up
- Gas pressure drops
- Components wear out faster
For Singapore homes, Mitsubishi aircon should be serviced every 3–6 months.
Why Choose Letscool Aircon?
At Letscool Aircon, we specialise in Mitsubishi aircon servicing and repairs across Singapore.
✔ Experienced technicians
✔ Proper diagnosis (no guessing)
✔ Transparent pricing
✔ Long-term cooling solutions
We fix the root cause, not just the symptom.
When Should You Call a Professional?
Contact Letscool Aircon if:
- Your Mitsubishi aircon is not cold after cleaning the filters
- Cooling problem keeps returning
- Aircon leaks water or shows error codes
- The electricity bill increases suddenly
Early repair prevents compressor damage and costly replacements.
Conclusion
A Mitsubishi aircon not cold is usually caused by dirty components, gas issues, electrical faults, or incorrect sizing. With timely servicing and professional care, your unit can cool efficiently again.
📞 Call Letscool Aircon today for trusted Mitsubishi aircon solutions in Singapore.
