If your AC suddenly stopped cooling with no warning, the most common causes are a tripped breaker, compressor thermal protection, or Child Lock on the remote switching mode accidentally.
Data Verified: 2026First, check the remote display — ensure mode is still 'Cool' and a timer or sleep mode did not switch the AC to Fan-only mode. This accidental mode change explains sudden cooling loss in many cases and takes seconds to fix.
Check your circuit breaker panel — the outdoor unit breaker may have tripped due to a voltage surge. Reset it by switching off then on. Also check if there was a recent power cut, which can cause the AC to restart in a different mode.
If the outdoor unit suddenly stopped running (you can hear it stop), the compressor triggered thermal protection due to overheating or a voltage spike. Wait 10–15 minutes for it to cool down, then restart. If it trips again quickly, there is an underlying fault — call a technician.
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Why did my AC suddenly stop cooling when it was working fine?
Check remote settings first — mode may have changed to Fan. Then check circuit breakers. If outdoor unit stopped, it may have tripped thermal protection due to overheating.
Will AC resume cooling after breaker reset?
Yes, in most cases. Reset the outdoor unit breaker and restart the AC. If it trips again within 10 minutes, there is an electrical or overheating fault that needs a technician.
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