Aircon Compressor Repair Singapore

Diagnosis visit $46.00, transport included. You get a quote before any repair starts.

Short answer: it is often not the compressor.

The compressor sits in the outdoor unit and pumps refrigerant around the system. When it will not start, keeps cutting out or makes a racket, the cause is usually something around it: a failed start capacitor, an overheated unit with a clogged coil, low gas from a leak, or an electrical part. Those are much cheaper to fix than the compressor itself, so have them tested first. A StringsSG repair diagnosis visit is $46.00, transport included.

Signs Your Aircon Compressor Has a Problem

The indoor unit blows air, but it is room temperature.
The outdoor fan spins but the compressor does not kick in, or the unit just hums.
The compressor clicks on and off every few minutes.
Loud knocking, rattling or grinding from the outdoor unit.
The breaker trips when the aircon starts.
An error code on the indoor unit; see the codes for Daikin, Panasonic, LG and Samsung.

What Usually Causes It, and What Fixes It

Causes of aircon compressor problems in Singapore and their fixes
Cause	What you notice	Fix
Failed start capacitor	Outdoor unit hums but the compressor does not start; fan may spin	Replace the capacitor - see aircon capacitor
Overheating from a clogged outdoor coil	Compressor runs, then cuts out after a while; outdoor unit very hot	Condenser chemical cleaning ($108.35 for one) - see condenser cleaning
Low refrigerant from a leak	Weak cooling, ice on the pipes, compressor running non-stop	Find and fix the leak, then refill - see aircon gas leak
Electrical fault: contactor, wiring or control board	Compressor clicks on and off, will not engage, or an error code shows	Replace the faulty part - see aircon PCB repair
Seized or burnt-out compressor	Trips the breaker on start, loud knocking, or no response at all	Compressor replacement, or replacing the unit if it is old

Before You Call a Technician

Check the breaker and the isolator switch next to the outdoor unit are on.
After switching off, wait 3 to 5 minutes before restarting; most units delay the compressor on purpose to protect it.
Clear anything stacked against the outdoor unit so air can flow through the coil.
Clean the indoor filters; a choked filter can make the system freeze up and stop.
Note any error code and the model number from the label before you book.

Repair or Replace?

The parts around the compressor are routine repairs. A compressor that has seized or burnt out is replaced, and on an older unit that can cost a large share of a new aircon. As a rule of thumb, if the unit is more than eight to ten years old, still runs on R22, or has needed several repairs already, put the money towards a new, more efficient unit instead; see aircon supply and installation. Check your warranty card first, because many brands cover the compressor for longer than the rest of the aircon.

How StringsSG Handles a Compressor Fault

Book an aircon repair and describe what the unit is doing. The technician tests the capacitor, contactor, gas pressure and the compressor's current draw to find the actual fault, then quotes the repair before any work starts. Repairs carry a 30-day workmanship warranty. For background, read compressor vs condenser or go back to all aircon repair problems.

Aircon Compressor Repair FAQs

The most common causes are not the compressor itself: a failed start capacitor, a tripped breaker or isolator, a worn contactor, or the compressor's thermal protection cutting out because the outdoor coil is clogged and it overheated. Low refrigerant from a leak can also stop it. A technician tests these first, because they are far cheaper to fix than the compressor.

It depends on what has actually failed. With StringsSG the repair diagnosis visit is $46.00, transport included, and you get a quote before any work starts. A capacitor or contactor replacement is a small job; a condenser chemical clean that stops overheating is $108.35 for one condenser; replacing the compressor itself is the most expensive repair and is quoted for your specific model.

The parts around the compressor, such as the capacitor, contactor, wiring and overload protector, can be repaired or replaced. A compressor that has seized, burnt out its windings or lost compression is replaced, not repaired. On an older unit, replacing the compressor can cost a large share of a new aircon, so compare both before deciding.

Rattling usually means loose panels, mounting bolts or debris in the fan. A loud hum or buzz with no cooling often points to a failed capacitor, so the compressor is trying and failing to start. Knocking or grinding from inside the unit can mean worn compressor internals, which needs a technician to check before it fails completely.

Often not. If the unit is more than about eight to ten years old, still runs on R22 refrigerant, or has needed several repairs, the money usually goes further on a new, more efficient unit. Check your warranty card first: many brands cover the compressor for longer than the rest of the aircon.