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I have a Excalibur 8500-III Furnance. I adjust the thermostat and nothing happens. Could anyone give me some advice as to where to start troubleshooting...Thanks
Hi Mickey, First check the fuse, check the circuit breaker on the furnace. Check for 12 volts (min. 10.5) at the timer relay with the therm' turned up. It's the small box with 4 wires to it on the fan cover. If power there, check the red wire at the motor. If power there it's the motor. Or it could be a bad thermostat. If you have a point type therm', remove the two wires from the back and touch them together for a minute or so, if the furnace works it's the thermostat. Just some suggestions for starters. Easier to figure out if I'm there. Good luck!
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