Before you troubleshoot: safety first
Never open the electrical panel of an AC or attempt to work on a live unit. Refrigerant handling, capacitor discharge and high-voltage components all require certified technicians.
The steps below are safe visual checks that can help you describe the problem accurately when you call for service — and sometimes resolve it entirely.
AC is running but not cooling
Check the thermostat setting — cool mode, temperature below room temperature, and fan set to auto.
Inspect and clean the air filter. A dust-clogged filter is the single most common cause of weak cooling.
Look at the outdoor unit. If the fan is not spinning or the coil is caked in dust, the compressor cannot dissipate heat.
If cooling is still weak after these checks, the likely cause is low refrigerant, a failing capacitor or a dirty evaporator coil — all technician jobs.
AC is leaking water indoors
Turn the unit off immediately to prevent damage to walls, ceilings and electronics.
The overwhelming majority of leaks are caused by a blocked condensate drain line or a dirty evaporator coil.
A technician can pressure-flush the drain and clean the coil in under an hour.
Strange noises from the AC
Rattling: usually a loose panel or fan blade — safe to note and call for service.
Buzzing: often an electrical component such as a contactor or capacitor — needs prompt attention.
Grinding: a failing motor bearing — do not run the unit until it is repaired.
When to stop DIY and call a technician
If cooling has not returned after cleaning the filter and clearing debris around the outdoor unit, book a professional visit.
Any unusual smell, smoke, tripped breaker or visible refrigerant leak is an emergency — call our 24/7 line immediately.