Outside unit just hums, dunno what tune.
Put a call in, service tech says it's the capacitor. I seen Back to the
Future, and not about to fall for a scam.
Could it be the thermostat or low on freezone?
If he made this determination in person, it sounds reasonable. If he
just speculated this over the phone, it is possibly something else. The
contactor in the condenser is powered (24 volts) from the thermostat and
many contactors hum when energized. The electricity to the condenser
motor, which works through the contactor, may be off, or otherwise
It's easy enough to check:
1. Flip breaker or otherwise remove power.
2. Open business side of compressor unit.
3. Find capacitor(s). They look like small aluminum cans with wire plugged
4. Take picture of wires and mark on chassis.
5. Remove capacitor(s).
6. Take to Graingers and say "Gimme some like this" (about ten bucks).
7. Install new.
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