Furnace trouble again .....
I don't know what I did wrong this time .... So back to the 1999 28-T Bounder. I put a new furnace in last year ... second time I did this .. SUBURBAN FURNACE SF-35 I had also found the safe...
Forum Discussion
There will be an 1/8" pipe plug on the gas valve where you can put an adapter to measure the pressure of the gas. Ideal is 11 inch water column but I think the range is 11 to 14 - read your installation manual. It sure sure sounds like the furnace is getting too hot and the limit switch is interrupting the heating cycle. It would be normal for the fan to continue to run and cool down the overheat condition. If you don't have a manometer to measure the gas pressure you can make a "U-Tube Manometer" with a piece of clear plastic hose about 1/4" ID. You fill it with water about 1/2 way. The gas proper pressure will push one side down 5-1/2" while the other side goes up 5-1/2" (for a difference of 11"). There's probably a YouTube video covering making one and using it.
