Our HVAC stopped working in the hottest week of the summer (so far…). Rather than call an HVAC tech, I’m trying to fix it myself.1

Symptoms: no fans start running even though thermostat is correctly set (and for that matter, fan set to “on”).

Checks so far:

  1. Breakers
  2. Thermostat batteries
  3. Short yellow to red and wait two minutes
  4. Interrupter by condensor
  5. Look for fuses in furnace control circuit and interrupter (there were none)

At this point, I think it’s time to verify voltages and signals, starting with the transformer and furnace control circuit, then moving outside to the condensor.

Wish me luck!

1After all, what could go wrong? ;-)

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