Had my new unit for six weeks and the furnace will not light up .... will cycle on 3 times for about 5 seconds, then shuts off. Have to shut off furnace at thermostate and turn back on to try another cycle. I took about 15 cycles during the night to turn on, but off again this morning. Any ideas what may be wrong?
2013 bh 3585 - furnace not stay on
- Thread starter Murman
- Start date
danemayer
Well-known member
Hi Murman,
The ignition sequence is failing and after 3 tries it goes into a safety lockout condition. Shutting off the thermostat clears the lockout.
The most common cause is poor propane supply to the furnace. This can happen if you're running low on propane in one tank and the other tank is not open (or if you opened it too fast and the overflow protection activated). It can also be caused by problems with regulators or the pigtails from tank to regulator.
Check the propane tanks first. We have 40 pound tanks that weigh about 32 pounds empty; 72 pounds full. 30 pound tanks probably weigh around 27 pounds empty; 57 pounds full. The tank can still weigh quite a bit when it's nearly empty.
If you have at least one full tank, close the valve, wait about 15 seconds, and open the valve very slowly. If you open it fast, the overflow protection device may activate, cutting off propane flow. If the furnace doesn't light reliably, move the tank to the other side of the coach and try it there. If it works on one side and not the other, there's a problem with pigtail or regulator, or crossover hose.
It could be other things like insects building nests or other stuff getting into the air intake. Or low voltage to the furnace.
There's some additional informaton in our Heating and Cooling Guide located in the manuals section of the forum. Furnace info starts on page 15.
Let us know what you find.
The ignition sequence is failing and after 3 tries it goes into a safety lockout condition. Shutting off the thermostat clears the lockout.
The most common cause is poor propane supply to the furnace. This can happen if you're running low on propane in one tank and the other tank is not open (or if you opened it too fast and the overflow protection activated). It can also be caused by problems with regulators or the pigtails from tank to regulator.
Check the propane tanks first. We have 40 pound tanks that weigh about 32 pounds empty; 72 pounds full. 30 pound tanks probably weigh around 27 pounds empty; 57 pounds full. The tank can still weigh quite a bit when it's nearly empty.
If you have at least one full tank, close the valve, wait about 15 seconds, and open the valve very slowly. If you open it fast, the overflow protection device may activate, cutting off propane flow. If the furnace doesn't light reliably, move the tank to the other side of the coach and try it there. If it works on one side and not the other, there's a problem with pigtail or regulator, or crossover hose.
It could be other things like insects building nests or other stuff getting into the air intake. Or low voltage to the furnace.
There's some additional informaton in our Heating and Cooling Guide located in the manuals section of the forum. Furnace info starts on page 15.
Let us know what you find.
update: finally had to call for service and had one heck of a time getting the furnace out .... sent to bench test and found circuit board was bad and had to be replaced .... first time this tech had seen new furnace with bad board in over 35 years .... got back in place last Friday and we have been comfy warm all weekend. Now in discussions on how much warranty will cover.
