You can fix this
Likely cause: a clogged condensate drain
Trane lists a clogged drain line as a cause of warm air. Many systems have a float switch that stops cooling when the drain backs up.
Why this happens
As your AC cools, it pulls water out of the air and sends it down a drain line. Trane lists a clogged drain line among the reasons an AC stops blowing cold air, and Honeywell notes that a float switch in the pan can cut power when water backs up. Clearing the line usually gets cooling back.
How to fix it
- Set the thermostat to Off.
- Soak up standing water around the indoor unit with towels or a wet/dry vac.
- Follow the steps in the AC leaking water troubleshooter to vacuum and flush the drain line with vinegar.
- Once the pan drains, set the thermostat back to Cool and confirm the outdoor unit starts.
If this does not fix it, tell the HVAC technician
- Where the water was and whether the AC had shut itself off.
- What you did to clear the drain and whether it came back.
- Any rust in the drain pan or water damage nearby.
Build the full list: what to tell the HVAC technician.
Start this troubleshooter over
References (every fact above comes from one of these pages)
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