| ecman51, the plate with the 2 wires above the gas valve is the limit switch. The red wire to it has the fusible link which connects to the limit switch. As I mentioned, I would guess that voltage was going through because the circuit does not appear to be open. But I will check on Wed.
The control circuit board is located inside the box above the blower (pic 4). I have not had a chance to open that up yet and will do so on Wed. The schematic does indicate one relay on the board. Replacement circuit boards show that they use 2 relays now...don't know why. While I've seen switches and boards available for my model, I have not seen any replacement relay for my unit. Is it something that normally can be replaced? Are they plug in or usually requires soldering?
Skip4661, I will check the heat relay on Wed. AFAIK, if a circuit is open, Ohm reading should read infinity; 0 ohms usually means there is no break in the circuit. But I will check the voltage just to be sure.
Seattlepioneer, I definitely do not recall hearing any clunk when turning off and on the furnace switch. So it may very well be a bad relay. I'll try to get better photos up on Wed.
Thank you all for your assistance!  |