RV Repair: hydro flame, hydro flame, flame heater

Question
I have a hydro flame heater model 8535-11 having problems short cycling  come on goes off in short times turn the thermostat up all the way will run longer this is a 1993 ALFA 5TH WHEEL HELP

Answer
Hi Rod. Sounds like a bad Thermostat. If that dose not fix it, I would remove the outside cover and wire the two blue wires together and see if it still dose it. If so the problem is in the furnace itself. If not, check the wiring to the thermostat. Let me know how it turns out.