Decision paths
AC Troubleshooting Guide
Work through the path that matches your symptom. Each one stops where homeowner troubleshooting should end and professional diagnosis begins.
Nothing here requires tools beyond a filter and a flashlight.
24/7 availability for urgent cooling problems in Gainesville and nearby areas.
Path 1 — Nothing happens at all
- 1
Check the thermostat
Blank screen? Replace batteries. Set mode to COOL and the setpoint below room temperature.
- 2
Check the indoor service switch
A switch near the air handler is often mistaken for a light switch and turned off.
- 3
Check the breakers
Look for tripped breakers labeled air handler and condenser. Reset once only.
- 4
Check the drain pan
A full pan trips a float switch that cuts control power, which looks like a dead thermostat.
- 5
Still nothing
Stop. Low-voltage faults, transformers, boards and safety circuits require testing. Call 352-707-8045.
Path 2 — Fan runs, air is warm
- 1
Verify mode
Confirm COOL, not FAN or HEAT, and set the fan to AUTO.
- 2
Go outside
Is the condenser fan spinning? Is the compressor running?
- 3
Silent outdoor unit
Check the condenser breaker and the disconnect handle. Reset a tripped breaker once.
- 4
Humming with no fan
Likely a failed capacitor or fan motor. Turn the system off to avoid overheating the compressor.
- 5
Next step
Stop here. Electrical work at the condenser is not a homeowner task — capacitors hold a dangerous charge.
Path 3 — Cooling is weak
- 1
Filter
Replace it if it is loaded. Note whether cooling improves over the next few hours.
- 2
Vents and returns
Open closed registers and clear furniture or rugs blocking returns.
- 3
Outdoor coil
Look for grass clippings, pollen mats or vegetation crowding the unit.
- 4
Check for ice
Ice on the copper lines or coil means switching to fan-only and letting it thaw.
- 5
No improvement
Charge, coil condition, blower performance and duct restriction need measurement. Request service.
Path 4 — Water or ice
- 1
Water at the indoor unit
Turn cooling off, protect flooring, and check whether the exterior drain is dripping.
- 2
System shut itself off
That is likely a float switch on a full pan. Leave it alone and request drain service.
- 3
Ice present
Set cooling off and fan ON. Allow several hours to thaw. Replace the filter meanwhile.
- 4
Recurring freeze
Airflow or refrigerant charge is the cause; repeated freezing damages compressors.
- 5
Ceiling stains
Treat as urgent — water above finished ceilings causes damage quickly.
Stop immediately if you notice any of these
- Burning, hot-plastic or electrical smell.
- Smoke, sparking or scorch marks.
- A breaker that trips a second time.
- Grinding, screeching or loud banging from the equipment.
- Water spreading into drywall, ceilings or flooring.
- A gas smell, which is a utility emergency rather than an AC issue.
Never open energized panels, discharge capacitors, bypass float switches, add refrigerant or disassemble equipment. Turn the system off and call 352-707-8045.
Frequently Asked Questions
- How many times can I reset a tripped breaker?
- Once. If it trips again, something is drawing fault current — a shorted motor, failing compressor or damaged wiring — and repeated resets create a fire risk.
- What should I check before requesting AC repair?
- Thermostat mode and power, filter condition, the indoor service switch, breakers, open vents, whether the outdoor fan spins, and whether there is water or ice. Those observations speed up the diagnosis.
- Is it safe to hose off my outdoor unit?
- A gentle rinse from the outside is generally fine with the system off at the breaker. Avoid pressure washers, which bend fins and drive debris deeper.
- My AC works after I turn it off and back on. Is that fine?
- It usually means a safety or lockout is tripping. The underlying cause — often pressure, drainage or a weak component — is still there and will return.
Related pages
Prefer to talk it through? Call 352-707-8045 or send a service request.
AC Trouble in Gainesville?
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