Furnace Intermitant Burn

[Longhorn1998]

2015 Jayflight 32TSBH
The furnace comes on an lights as normal but will only burn for 30 seconds at most. The burner will then cut off and the fan stays running. The burner will then reignite and go through the same cycle. The camper is being heated it just takes a long time. Shouldn't the burner stay lit the entire time?

[bedrck46]

What temp do you have the T/Stat set for

[ALJO]

Check for a flattened hose or blocking there seems not to be enough airflow.
Also check for blocking of the return air.

[slabat]

You should check for a blockage in the exhaust airflow. I had the same issue with mine, I brought it in and their was a part of the tube that had collapsed.

[oldmanAZ]

Originally Posted by Longhorn1998

2015 Jayflight 32TSBH
The furnace comes on an lights as normal but will only burn for 30 seconds at most. The burner will then cut off and the fan stays running. The burner will then reignite and go through the same cycle. The camper is being heated it just takes a long time. Shouldn't the burner stay lit the entire time?

Welcome to the JOF.

Is this the first time you've used the furnace?

Of course, if it's still under warranty, you should have the dealer check it out.

[buckeyejim]

It could be a bad thermostat, turn it to 90 and see if it stays on, & also said check the duct work.

Buckeyejim
Columbus OH

[ROC-REQS]

Hi Longhorn,

Welcome to the JOF

Originally Posted by Longhorn1998

2015 Shouldn't the burner stay lit the entire time?

The blower will run for 15 seconds before the furnace burn is ignited.
Then once the burner turns off, the blower will continue to run for 1min 30sec.
This is standard operation of the furnace.
So the normal sequence for a furnace from turn on to turn off is:
Furance turns on.
15 sec - Blower only
xx time - Burner & Blower
1min 30sec - Blower only
Furnace turns off.

I'm having a similar problem with our furnace - see this post if you're interested: http://www.jaycoowners.com/forums/f3...urn-31600.html

If you have access to your furnace and can see the control board there's an diagnostic LED on the board that may give you some indications if your problem is due to the furnace issue.
How often the LED flashes is associated with an error code:
Single Flash = Sail Switch is bad
2 Flashes = Bad Electrode
3 Flashes = Bad Circuit Board
We got this info from an Atwood tech when trying to isolate the cause of our furnace problem.

Does the furnace shoot off completely (i.e., bower off)?
How long is the furnace off before it starts again.

Do you have a digital or analog (i.e., slide) T-Stat?
A Digital will give you ~+/- 2 Degree swing.
An Analog will give you ~+/- 6 Degree swing
Between controlling the furnace on & off.

Have you set a house thermometer near the T-Stat to see what temp reading it gives?

Where is the T-Stat located? Could it be getting any drafts around it or from inside the wall?

Maybe cover up the T-Stat with a clear Tupperware container to block any airflow and see if the burn time is the same.

Hope this is of some help.
Good luck

[Longhorn1998]

Thanks for all the replies. I've tried setting the tstat at 90. That didn't change anything. I'll try the other suggestions and report back.

[edfgrf]

My furnace had water on the board. Dealer replaced board. The furnace acted very similar to yours.