One item in our otherwise excellent '88 Kit 5er that has bugged us pretty much since bought new, is the Duo Therm heater - it will turn on with the thermostat as it should, but then after several minutes operation, will shut down prematurely, before the heat exchanger even has cooled properly. It then re-starts after a few minutes, and the cycle repeats. There is an obvious fire danger, and the steady off/on operation takes a long time to finally get the RV up to proper set temperature - and we wouldn't dare go off in cold weather and leave the heater unattended!
Fortunately, we're "fair weather Rvers", so the heater hasn't been a serious issue - but I *would* like to correct it in case we decide to give the 5er to one of our kids, or sell it.
I've replaced the thermostat, the solid state heater module inside the heater, checked the sail switch, and both of the internal heat safety sensors. I've also carefully disassembled the burner gas flow valve, and verified proper operating voltage to the heater - but nothing I have done or replaced has cured the problem - and I really suspect the gas flow valve solenoid is the problem - that's about all that's left!
SO, I'm wondering if anyone here has had a similar problem and found the cure - OR, perhaps has the guts out of the same vintage Duo Therm heater they'd part with - or a possible source for that, or a complete heater KNOWN to be in proper operating condition?
Any help or suggestions?