Warm air from a unit you wanted cold is either a control issue (heat mode on a heat pump), an outdoor unit that is not pumping, or a compressor that is sitting there as a noisy heater. Some UAE units are cool-only; others are heat pumps left on auto.
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Problem
AC blowing hot air
Warm air from a unit you wanted cold is either a control issue (heat mode on a heat pump), an outdoor unit that is not pumping, or a compressor that is sitting there as a noisy heater. Some UAE units are cool-only; others are heat pumps left on auto.
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Causes
- Remote in Heat or Auto
- Outdoor fan/compressor not running
- Reversing valve stuck on heat pumps
- Complete loss of refrigerant
- Dirty outdoor coil in extreme heat making discharge lukewarm
What you can safely check
- Set Cool, not Auto, and hold it there.
- Check outdoor activity.
- Filter check.
When to get a technician
Mode is Cool and supply air is still body-warm after 10–15 minutes.
Lukewarm is different from actually hot. Heat-mode accidents are five-minute jobs. Dead compressors are not. We measure before we guess.
Related: AC Not Cooling from AED 150 in Dubai, Abu Dhabi & Al Ain.
FAQs
Can heat mode damage the unit in summer?
Running heat in 45°C is hard on the plant. Switch to Cool and stop.