"New" camper, 2013 Jayco Jayflight, Furnace not staying on.

[kmccartn]

Hi there, We are out for the first time with our "new" 2013 Jayco Jayflight. The furnace will not stay on consistently. In 12 hrs, it's come on 3 times, blew hot air maybe 45 seconds and then went off. The thermostat has 2 sliders, top and bottom. I do not know WHICH is for heat/for cool. Is the AC impacted, too? Don't know but tomorrow it's going to be warm - hopefully the AC will work then. We've done a lot of trouble shooting otherwise, but are stumped on the lack of heat. Any advice you have would be so appreciated. Thank you!

 

[JFlightRisk]

Our TT is a 2012 Jay Flight, but has a Coleman thermostat, with one slider for temperature setting, and two slide switches towards the lower front for heat/AC and fan. I'm not finding a one that functions both heat and AC, with two slider controls. A picture of it, or brand and model of T-stat would help narrow it down. There's also a possibility a previous owner replaced the original one with something different.

 

[kmccartn]

Our TT is a 2012 Jay Flight, but has a Coleman thermostat, with one slider for temperature setting, and two slide switches towards the lower front for heat/AC and fan. I'm not finding a one that functions both heat and AC, with two slider controls. A picture of it, or brand and model of T-stat would help narrow it down. There's also a possibility a previous owner replaced the original one with something different.

Here’s a picture of the Coleman Mach thermostat. My apologies for the two sliders info. It’s actually two ties of temperatures , as you can see. We’re plugged into electric and are not using propane. We’re pretty intimidated trying to work on a furnace, so I haven’t googled much on it. Campsite owner said it could be any number of issues. It did come on a couple of times today for half a minute and then went off again. Thank you for any insight you may have.

 

[kmccartn]

Here’s a picture of the Coleman Mach thermostat. My apologies for the two sliders info. It’s actually two ties of temperatures , as you can see. We’re plugged into electric and are not using propane. We’re pretty intimidated trying to work on a furnace, so I haven’t googled much on it. Campsite owner said it could be any number of issues. It did come on a couple of times today for half a minute and then went off again. Thank you for any insight you may have.

Oh, and it set to OFF right now, but it has been on HEAT.

 

[craigav]

It would be much more likely that the issue is not with the thermostat and instead it is with the furnace. What I would suggest is that you test your A/C operation prior to the heat of the summer. If the A/C doesn't work reliably (which I suspect it will) then certainly there could be a thermostat issue, but if the A/C does work as it should, then the furnace needs to be serviced. ~CA

 

[Kevin Cooper]

Since the furnace lights and shuts off after 45 seconds, it might be the overtemp thermal detector. Mine is accessible from the front, but others are not. There is a round disc that most likely has two blue wires to it. One is from the sail switch, and the other goes to the printed circuit board. So, it may be failing and shutting the furnace down because it incorrectly opens without being overheated.
If it’s not this, the next likely suspect is the printed circuit board. If you find that it is the board, find online and buy a “Dinosaur” board. Very high quality.
If you are not good with this kind of thing, you may need a mobile tech.
Best wishes.

 

[JFlightRisk]

That's the same T-stat we have. You say you're not using propane? ("We’re plugged into electric and are not using propane.") The tanks have to be turned on for the furnace to fire up, and sufficient charge in your battery. Fan switch set to auto, and system switch set to heat.

Light a stove top burner to assist getting propane in the system. The furnace fan will come on for several seconds to purge the heat chamber. If there's propane at the furnace, it'll get the signal to open the gas control, and it'll fire up and stay that way. Your furnace will make three attempts to light before it shuts down, at which point you have to reset the T-stat to off, then back on. It may take a couple of tries before the propane gets to it. Viable propane doesn't stay in the line if it's not used for a couple of weeks.