An air conditioner may not turn on despite the thermostat set to Cool because power or safety controls are preventing startup. The most common cause is a tripped breaker cutting power to the indoor or outdoor unit. Other frequent triggers include a full condensate pan lifting the float switch (a safety that stops the system when the drain line clogs), dead thermostat batteries, or a switched-off service switch near the air handler. After humid weeks, we often find a stuck float switch from algae growth in the drain pan. We resolve these no‑start calls throughout Atlantic Beach and the surrounding Beaches. If you can’t restore power, professional service is the next step, and after‑hours repair is available when needed.
Try these quick checks before calling:
- Reset the AC and air handler breakers once; do not keep flipping them.
- Replace thermostat batteries; set Cool and lower 3–5°F; try Fan On to confirm indoor power.
- Check the condensate pan/float; if raised, clear the drain and give it time to drain.
- Make sure the air handler/furnace switch and the outdoor disconnect are on.
If the breaker trips again or you see water around the air handler, turn the system off and schedule a licensed HVAC technician.
Updated: 2026-06-11
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