Hi all, anybody out there ever been into one of these old furnaces?? Trying to get this old girl ready for some early spring camping.
The furnace in the old '82 Cross Country won't fire off. Suburban NT30M . I'm plugged into shore power and am getting 13.3v to Tstat. Should both blue wires have 13.5 at the Tstat?. I assume its functioning ok since the fan runs. Fan runs fine. No ignition, no gas. I dropped power to the Tstat before I pulled it in case it was in "lockout". The power plug is a flat 3 prong. Have 13.3v at the plug end at furnace on the red/blue lead. 65lb. tank is full, just had it filled. Range/oven and refer works great. Freezer froze water in a couple hours. Ignitor doesn't
spark. I took it out and cleaned the contacts. On/off gas valve at furnace gas line is open and clear of obstruction.
Pulled the furnace. Sail switch appears to make good contact when switch is moved manually. There's no continuity between the posts on the limit switch. Should there be w/ no power to the unit? I'm no electrician so am not sure of the terminology - normally open/closed, etc.
Thinking maybe the limit switch is stuck/bad not proceeding to the next sequence of letting the gas in and ignitor spark??
Not sure how to bench test everything i can with the unit out. I've downloaded info on troubleshooting this furnace http://bryantrv.com/docs2/docs/subntnew.pdf
but I'm a novice with this stuff.
Wondering if I took it to an RV service if they can bench test it. But, only want to do this as a last resort- kinda on a budget.
Also, while I have it out, would like to clean up the burner as I doubt the furnace has been used much. With only 26K on the rig and the PO didn't appear to be one to rough it much, it was probably used sparingly. I took out the 4 screws the pdf say holds it in, but it didn't want to
slip out. Is there something else I'm missing, don't want to tear anything up.
Any suggestions on where I go from here is appreciated.