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Originally Posted by Geocain3
I have a 2021 36vbds and I am wondering where my furnace is located at, and how I check/troubleshoot the sail switch or possible other problem.
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Inside the trailer, look for the big return air grille. The furnace is right behind it. You should use a #2 Robertson (square drive) bit to remove it, although sometimes combination head that also accept a #2 Phillips bit are used.
Outside the trailer, exactly corresponding to the inside location, you will see the air intake and exhaust vents. Sometimes it appears as two ports, around 2" each in diameter, sometimes two concentric ports.
Everybody wants to mess with the sail switch because it's the only part they understand. If your furnace ignites and runs, it's not the sail switch.
Quote:
Originally Posted by Geocain3
Furnace temporarily quit working but after a 5 minute “complete shutdown” it came back on and I have heat again, but would like to know so I can troubleshoot in the future in case something happens again
Thanks in advance
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This is much more likely to be the over-temperature high-limit switch. If the furnace gets too hot, it will shut down, even if the thermostat is still calling for heat. The plenum (where all the ducts connect) has gotten excessively hot.
Why does this happen?
Has someone obscured some outlet ducts? Maybe replaced the open floor vents with damper vents? Or put carpets down, covering vents. The manual tells you NOT TO DO THIS! Or maybe when you take off the return air grille you will find an excess of e.g., dog hair (we have a very hairy dog...) restricting return air flow.
If you want to confirm that it's the limit switch, and your furnace is an SF-series furnace, take off the grille. On the top front edge of the plenum, right in the center, is a sensor with a slide-on connector at each end--that's the hi-limit switch. It opens if the temperature gets too high. Run the furnace until it stops again. Jumper across the switch, or remove one wire and touch it to the other. If the furnace re-starts, that's the problem. Resolve it, as stated above, by cleaning/clearing the airflow paths.
DO NOT LEAVE THE LIMIT SWITCH BYPASSED. It is dangerous and could burn up your trailer.