Short cycling is rapid on/off. Compressors hate it. In the UAE you see it when a unit is too big for a closed bedroom, when a sensor reads the coil not the room, or when a protection device (high pressure, float switch) keeps kicking in.
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Problem
AC short cycling
Short cycling is rapid on/off. Compressors hate it. In the UAE you see it when a unit is too big for a closed bedroom, when a sensor reads the coil not the room, or when a protection device (high pressure, float switch) keeps kicking in.
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Causes
- Oversized split in a small room
- Blocked outdoor causing high-pressure cut-out
- Float switch on a filling pan
- Failing thermostat/sensor
- Electrical protection
What you can safely check
- See if it only happens with the door closed.
- Check for water in the pan.
- Clean filter and look at the outdoor coil.
When to get a technician
It repeats every few minutes after those checks.
Do not ignore it because ‘it still cools’. The compressor is being fatigue-tested. Diagnosis visit first.
Related: AC Diagnosis Visit from AED 150 in Dubai, Abu Dhabi & Al Ain.
FAQs
Will a smaller set-point stop it?
Usually no. If it is oversizing or a protection trip, the set-point is not the root.