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:
- Thermostat batteries
- Short yellow to red and wait two minutes
- Interrupter by condensor
- 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!