What Aircon Faults Do We Repair?
Most aircon repair jobs come down to a handful of parts. Our aircon servicing technicians in Jurong carry the common ones and can test the rest on the spot.
If you’ve got two to four wall-mounted units in your HDB flat, the same few faults tend to show up again and again. Here’s what we see most.
Capacitor
The capacitor gives the fan motor and compressor the kick they need to start. When it weakens, the unit may hum without starting, or the outdoor fan may not spin.
It’s one of the most common and affordable repairs. A 2026 price guide from Helpling puts a full capacitor replacement in Singapore at about $140 to $240 including labour, while the part itself costs far less. The humming is your clue to call us early, before the strain spreads to the compressor.
Fan motor
A failing fan motor makes grinding or squealing sounds, or the indoor fan runs slowly. Airflow drops and the room stays warm.
Many people assume the gas is low when this happens. If the unit runs but feels weak, we check the fan first.
PCB control board
The PCB control board runs the whole unit. Power surges and moisture can damage it, leading to a unit that won’t respond to the remote or shows an error code.
PCB faults are easy to misdiagnose, so we test before we replace anything. Board prices vary a lot. According to aircons.sg, a PCB in Singapore runs about $120 to $350 plus labour, and branded boards from Daikin or Mitsubishi Electric cost more than generic ones.
Thermistor
A faulty thermistor misreads temperature, so the unit cuts off too early or runs non-stop.
On Daikin units, codes such as C4 and C9 point to a thermistor fault, according to the Cool Aircon troubleshooting guide. A sensor swap is usually a small job once we’ve confirmed it’s the culprit.
Contactor and wiring
In the outdoor unit, a worn contactor can stop the compressor from switching on even when the indoor fan runs.
Contactors and capacitors are both low-cost parts. City Cooling Engineering advises confirming the compressor is truly at fault before anyone quotes a big repair, and we agree. Rule out the cheap parts first.
Same-Day Emergency Repair
A dead aircon in Singapore heat is more than an inconvenience, especially with young children or elderly family members at home. The Meteorological Service Singapore reported that June 2025 tied 1997 as the warmest June on record, and Changi hit 35.9°C on 28 October. We offer same-day slots in Jurong, subject to availability.
Our team travels from Simei on the east side, so we can’t promise a time in minutes. Here’s how to give yourself the best chance of a quick visit:
- WhatsApp early in the day with the fault, brand and address
- Send a photo of any blinking light or error code
- Be flexible on the time window if you can
That photo helps more than you’d think. A blinking light on a Daikin can mean normal standby or a stored fault, and the colour matters. Airconnection’s Singapore guide says a red blink signals a serious fault, so switch the unit off and message us.
If no same-day slot is open, booking for the next day still gets you the widest choice of times.
Find the Right Repair for Your Symptom
Not sure what’s wrong? Match what you notice to the right page below.
| What you notice | Go to |
|---|---|
| Unit runs but room stays warm | Aircon not cold repair |
| Water dripping from the indoor unit | Water leak repair |
| Rattling, buzzing or grinding | Noisy aircon repair |
| Cooling fading slowly, ice on pipe | Gas top-up |
| Bill rising for no reason | High bill diagnosis |
Repair or Replace?
We repair inverter systems and non-inverter systems from Daikin, Mitsubishi Electric, Panasonic and other common brands. When a unit is very old and the compressor has failed, repair costs can approach the price of a new unit. In that case, we tell you straight.
Two rules of thumb from Singapore aircon firms can help you decide:
- Replace if the repair quote is more than 50% of a comparable new unit, according to City Cooling Engineering and aircons.sg.
- Think hard about replacing if the unit is over 8 years old and non-inverter, per City Cooling Engineering.
- Compressor replacement alone can run from $350 to $900 or more, according to SJR Aircon’s 2026 price guide.
Replacement and installation are handled by our parent company, Cool Earth Aircon.
Before we arrive, it helps to clear the area under the unit. Our guide on preparing your home for an aircon visit covers the details. When you’re ready, WhatsApp us the fault, brand and address, and we’ll find you a slot for your aircon repair.
