I'll try it. Recently got a High Limit error, but the switch ohms short. The furnace will run ok for about 5 mins after it has been shut down for 15-30 mins. Once it begins to warm up the symptoms repeat. That sensor does look like it could use cleaning. I'll wait for it to cool down and clean it.
Yes replaced the filter. I cleaned this sensor. It came up ok. I think the igniter was staying on before (glow) but now it's not.. That would make sense right? If the sensor did not prove flame, the ignitor would want to stay on?
seems to be working correctly now Russ. Thanks! I'd like to let it run for awhile though. You wouldn't happen to have a part number for that sensor would you? The furnace is 16 years old
Thanks I'll close out the call. Excellent help with this, thanks again