New member checking in

[LRkeystone20365rl]

Montana high Country 2020 365rl
Trouble with dometic furnace dfmd36131
Light on unit blinks continuously.. nohing in the book for continuous flashing! we've changed out the sail switch. Furnace /fan does not come on at all. Checked fuse, turned on cook stove and it lights....any ideas!

[Gary R.]

Greeting and welcome to the forum!

Sorry to hear you are having issues with the furnace in your RV.

From your description, it sounds like the furnace may be in a lockout mode, and to clear that, try turning off the power to the thermostat and furnace for 20-30 seconds to initiate a reset. Now power it back up and see if the fault is cleared.

Since the RV is new, is your dealer close by? Perhaps he could help as well.

I'm sure others will chime in, so don't worry-there are many very knowledgeable folks on this forum.

Stay safe,

Gary

[LRkeystone20365rl]

Would that be the switch that is showing off and reset?

[LRkeystone20365rl]

Is this the switch that has off and reset?

[chuckster57]

First off welcome to the forum and thank you for taking on a HUGE task. Now as to your furnace:

If there is an on/off switch located on the furnace itself turn it off. then after about 10 minutes try again. There are a number of steps the furnace takes prior to ignition. Did it EVER work?

[LRkeystone20365rl]

Chuck..yes..it was runnung during the night. We will try the switch. We are away for a bit but will try when we return. Thanks

[chuckster57]

Your welcome. If that doesn't do it, I would schedule an appointment with the dealer. tell them that your full timing and it might get you a "waiter" appointment, Don't change any parts or tell them that YOU have changed anything as it may void your warranty.

[LRkeystone20365rl]

Shut off for about 20 minuts. Still blinking continuous. We are full time and with husbands work we are hour away from dealer.no time to take off. I have a call into a repair man..being Sunday will wait for reply. Should be under waranty...purchased last june. Thanks

[sourdough]

I bought a new 2020 Montana HC 331RL. Furnace worked fine on PDI and walk through. Drove it home 55 miles, sat in the side yard for 2 days while we sorted things, took it to a local RV park to give it a test drive and....no furnace. Wouldn't try to do anything. Did not look at the lights because the dealer said bring it in, park in front of the bay and we'll fix it while you are here, and, in 45 minutes it was running perfectly. Issue was a bad control board which they "redirected" for me.

[chuckster57]

I'm leaning towards the board like Danny's. Too bad the warranty requires an OEM board as replacement. Dinosaur boards are so much better.