Weird Heater Issue

Puddles wrote:

DazedNConfused wrote:
There are a number of safety protocols on a propane furnace that, when tripped, will force the furnace into a "Lockout" mode. That lockout is designed to keep the furnace from firing up and protecting the trailer's occupants. I don't have it handy, but I've seen some flow charts that document the various safety devices...and how they all operate. One thing to check is the temperature coming out of the vents. I believe when the furnace detects a heated air temperature of 160 degrees or more, it will lock it out. This is what happened to mine. When I measrued the temperature at the vent closest to the furance it was a very high 178 degrees -- so that's obviusly over the 160 lockout temp...and what was causing my furnace to run for a cycle, stop, and then not start again until I pulled and reinserted the fuse -- which reset the lockout condition.

Have you taken the temp at the vents and at the return to see where your numbers are? Just another idea.

- DNC

Curious as to what caused the overheating problem?

Ya'know...I still don't know. I was about to go through the process of pulling the furnace and putting it on the bench to diagnose it...but it was a new camper...and figured i better let the warranty take care of it. I don't know how much time they spent diagnosing....but know they ordered a new furnace...and it's in the shop now getting replaced (along with a number of other items i let build up before making the 3-hour round trip to drop it off). I have heard, though, that even things like high propane pressure could cause this. If they solve the problem by full replacement, I won't know exactly what was wrong. But I will post if/when I find out.