Condition
AC Clicks but Won't Start
You hear a click or hum but the compressor or fan does not run. Capacitor or contactor failure.
Possible Causes
Blown Start Capacitor
The capacitor provides the electrical 'kick' needed to start the compressor; without it, the motor won't turn.
Root Cause Analysis →Diagnostic Tests
- Measure microfarads
- Inspect for physical damage
Repair Options
Welded AC Contactor
Electrical arcing can 'weld' the contactor shut, causing the outdoor unit to run constantly.
Root Cause Analysis →Diagnostic Tests
- Ohm test
- Visual inspection
- Check coil voltage
Repair Options