UrgentDiagnostic guide
Home A/C not turning on at all
When neither the indoor nor outdoor unit responds, the fault is usually power, a tripped safety switch, or a failed capacitor — not the whole system.
01 / 04Likely causes
What is usually
behind it.
The shortlist of root causes we find on this call. The truck is stocked for most of these.
- 01Tripped breaker at the panel
- 02Float switch tripped from a clogged condensate drain
- 03Blown fuse in the disconnect box
- 04Failed run capacitor on the outdoor unit
- 05Contactor burned or stuck open
- 06High-pressure or low-pressure lockout
02 / 04Right now
Do this while you wait.
Steps that can save product, prevent damage, and shorten the repair once we are on site.
Do this
- Reset the breaker once, wait 5 minutes, then try the thermostat
- Check the condensate drain pan — if it has water, the float is likely tripped
- Look for a yellow or red light on the air handler control board
Do not do this
- Do not hold the breaker closed if it trips again immediately
- Do not open the electrical disconnect without shutting the breaker first
03 / 04On the truck
What our tech will check.
The diagnostic flow we run on this call. Most are resolved on the first visit.
- 01Test capacitor, contactor, and fuses
- 02Clear the condensate drain and reset the float switch
- 03Read error codes from the control board
- 04Confirm refrigerant pressure in the operating range
Fast dispatch
Most calls see a tech in under two hours.
First-visit fix
Common parts on every truck.
Documented
Photos and notes attached to your ticket.
04 / 04Related service
This sits under
our hvac service.
Heating, cooling, and air handling for homes — diagnosed honestly and repaired without the upsell theater.
Related problems
Might also be one of these.
Other failures with similar symptoms or in the same trade.
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