Help….. I am trying to repair an older 1985.ish Coleman Evcon heater running on propane gas. The problem is that the circulation blower short cycles continually. The reason the Blower is short cycling it the low temp switch keeps cutting out. I believe that the switch is operating properly because if I jumper over it to make the fan run continuously the unit will not provide heat to the from the floor registers. During this time the draft fan is running and I can see a blue/orange flame in the burner chamber. This leads me to believe that the main blower is cooling the heat exchanger to the point the low temp switch cuts out. So why am I not getting enough heat from the burner? Our propane tank is at 75% and the pressure gage at the tank shows 50psi without a drop in pressure when the furnace turns on. Water heater and stove are both working fine but they do not consume gas at the rate the heater does. I think my issues is in the burner (clean and to simple to really be the issue) or the control valve, but I am under the impression that short of taking the valve to a repair facility there is nothing I can do or check from here? Thanks Mike

Hey guys. I've got an American Standard 80 model. the thing come on fine, fires up.. run well for maybe 5-15 minutes. Then I've got a problem. it shuts off.. then it tries to relight itself. I can hear it click.. click click... each time the burners actually flame up, but do not stay on for more than a half a second. at first i suspected the unit was getting too hot, but if so, why would it try to fire up again? And, if it was a supply line problem, why would it run fine for the first 10 minutes? perhapse my sensor is shot? one other thing, it ran just fine before i got in there and vacumed it out... so i dont know what i did to it. Any help would be appriciated... also, im a noob when it come to this, so please explain and troubleshooting in detail. THANKS!