An air conditioner that was cooling fine this morning and is blowing warm air this afternoon is a different problem from one that has slowly faded. Sudden failures often point to something specific: a tripped breaker, a failed component, a frozen coil or a control fault. The way you handle the first hour can protect your family, limit damage to the unit and give a technician the clues they need.
Minutes 0 to 10: Make the room safe
- Look after people first. Move children, elderly relatives and anyone unwell to the coolest part of the home. Open shaded windows if the evening air is cooler than inside, and use fans.
- Hydrate. Drink water regularly. Do not wait to feel thirsty.
- Switch the AC off if there are warning signs. If you notice a burning smell, smoke, sparks, loud grinding, water near electrics or ice building on the unit, turn the AC off at its control and, if reachable, at the isolator.
- Do not keep fiddling. Repeated on-off switching can harm a compressor that is already struggling.
Minutes 10 to 25: Run safe checks
Work through these in order. They are things a householder can safely do.
- Remote and settings. Replace the batteries, check it is in cool mode and the temperature is set low enough.
- Power. Check whether the unit has any lights or display. Look at the breaker panel; if the AC's breaker has tripped, switch it back on once.
- Outdoor unit. If you can see it safely, check whether the fan is turning and the unit is humming. Do not climb or reach into it.
- Filter. Look at the indoor filter. If it is thick with dust, clean or replace it following the manual.
- Ice. If there is ice on the indoor unit or pipes, switch the AC to fan mode, or off, and let it thaw for an hour or two. Place a towel and tray to catch the melt water.
Minutes 25 to 40: Gather information
Write down what you have seen. A technician will ask:
- When did the cooling stop, and was it sudden or gradual?
- Did a power cut, a surge, a storm or a recent cleaning happen beforehand?
- Is the indoor fan running? Is the outdoor unit running?
- Are there any noises, smells, leaks or error codes?
- What are the brand, model and age?
Take photos of the model labels on the indoor and outdoor units and a short video of the symptoms.
Minutes 40 to 60: Decide what comes next
You now have a choice.
If a check fixed it, keep an eye on the unit. If the same symptom returns, something is wrong that the check only masked.
If it still does not cool, contact a technician. Describe what you saw and send the photos. Mention anyone vulnerable in the home so that urgency can be judged properly.
If you saw warning signs, keep the AC off until it is inspected. Our guide to when AC repair cannot wait explains what counts as urgent.
What commonly causes a sudden stop
Sudden stops are often electrical or mechanical: a tripped breaker, a failed capacitor, a seized fan motor, a compressor overload, a control board fault or a frozen coil. Gradual fading, in contrast, tends to come from dirt and low refrigerant. See AC running but not cooling for that case.
What not to do
Preparing for the next heatwave
Once the immediate problem is dealt with, take the lesson. Servicing the AC before summer through AC maintenance reduces the chance of a sudden failure on the hottest day, and having your technician's number saved saves minutes when it matters.
Need help with your AC or appliance?
Call or message us on WhatsApp. Tell us the appliance, its make and model if you have them, and what is happening. A photo or short video of the fault helps.
Available 24/7 · We aim to respond within 30 minutes · 6-month warranty on repair work
Frequently asked questions
Can a power cut damage my AC?
Power cuts and surges can stress compressors and control boards. After an outage, wait a few minutes before restarting, so pressures can equalise.
Why does the AC work again after I switch it off for an hour?
Compressor overload protection or a frozen coil may have cut cooling temporarily. It can fail again, so a technician should look at the cause.
Is it okay to use a fan while I wait?
Yes. Fans do not cool the air but help people feel cooler. Make sure they are in good condition and not overloaded on an extension lead.
How do I protect someone vulnerable to heat?
Keep them in the coolest room, offer water and cool wet cloths, and seek medical help if they show signs of heat illness such as confusion, vomiting or very hot dry skin.
