1. Dirty filter
A blocked filter cuts airflow over the coil, so it gets too cold and freezes.
How we fix itFilter wash in a general serviceAircon servicing from $54.50 →
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Why Is There Ice on My Aircon?
Ice on an aircon is a warning sign. Running it frozen can damage the compressor, so it's worth acting quickly.
The short answer
Ice forms when the indoor coil gets too cold, usually because of poor airflow (a dirty filter or coil) or low refrigerant gas. Switch the aircon off, let the ice melt fully, then clean the filter. If the ice comes back, it needs a technician.
Quick diagnosis: what is your aircon doing?
| What you notice | Likely cause | Fix | Cost |
|---|---|---|---|
| Ice on the coil, filter dusty | Blocked airflow | Clean filter (DIY) or servicing | Free / from $54.50 |
| Ice on the pipes at the outdoor unit | Low refrigerant gas | Gas top up and leak check | from $100 |
| Ice plus musty smell | Dirty, mouldy coil | Chemical overhaul | from $150 |
| Ice only on cool nights | Temperature set too low | Set 24–25°C | Free |
| Ice and the fan isn't spinning | Blower motor fault | Repair after diagnosis | $80 diagnosis* |
Prices before GST. *On-site diagnosis is $80 for a split system and is waived when you book the repair.
5 reasons your aircon is freezing, and how to fix each
2. Low refrigerant gas
Low gas drops the pressure in the coil, so it freezes. There's usually a leak to fix.
How we fix itLeak check and gas top upGas top up from $100 →
3. Dirty coil
Dirt and mould on the coil insulate it and stop heat transfer.
How we fix itFull dismantle and chemical soakChemical overhaul from $150 →
4. Setting too low
Running at a very low temperature on cool nights can cause frost.
How we fix itFree: set 24–25°C
5. Blower motor fault
If the indoor fan stops or slows, cold air isn't moved off the coil.
How we fix itMotor repair or replacementAircon repair: $80 diagnosis →
What you can check yourself
- Switch the aircon off and let the ice melt fully. This can take a few hours.
- Put a towel under the unit to catch the water.
- Clean the filters while it's off.
- Run Fan mode to dry the coil before cooling again.
- Set 24–25°C when you switch it back on.
Don't chip the ice off. You can damage the coil fins and pipes.
Ice on aircon: FAQs
How much does it cost to fix a frozen aircon?
At JL Aircond, general servicing starts from $54.50 and a gas top up from $100 per unit, before GST. A chemical overhaul from $150 cleans a dirty coil.
Is ice on my aircon dangerous?
It's not dangerous to you, but running a frozen aircon can damage the compressor, which is costly to replace.
How long does it take to defrost an aircon?
Usually a few hours with the aircon switched off. Running Fan mode can speed it up.
Can low gas cause ice on my aircon?
Yes. Low refrigerant gas is one of the most common reasons for ice on the coil or pipes.
Aircon keeps freezing? We'll fix it.
Send us a photo of the ice on WhatsApp. We'll tell you the likely cause and give you a quote.