Had a panic attack this morning. I test my natural gas furnace every thanksgiving weekend. It’s cold enough to have the heat on for a bit and warm enough if something is wrong I have time to fix it before the real cold comes.
Everything went fine until yesterday night. It was supposed to drop to 4* and I’ve got four seedlings to keep alive.
I woke this morning to find the heat wasn’t on. Advancing the thermostat didn’t work. Flipping the on/off switch didn’t work. Removing the main panel I was able to put the blower fan on manually so it had power.
At this point I turned off the power switch to let it sit and hopefully reset anything. We don’t have a error code window, just a couple of led lights on different parts that have flash codes.
I’ve replaced the blower a few years ago and the controller before that. Lightning strikes killed them years earlier. Otherwise just vacuuming twice a year, inside and all vents, is enough to keep it happy along with changing filters.
Just before we vacuumed this morning I removed the lower panel that has a kill switch, so the blower isn’t on with the panel off. I turned the power back on and pushed in the kill switch. I started to turn on! YES!
After the cleanup and filter check I assembled the panels again and things are back to normal. My guess is the panel cover vibrated lose enough to let the kill switch pop out.
So panic is over. It got a good cleaning. Filter’s clean. And switches are tested and working fine again.