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Old 09-09-2017, 02:35 PM   #1
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Senaca Furnace is Stuck On

2016 Seneca with 6k miles on it

Tailgating today and my heating furnace seems to be stuck on

Turned both ACs off last and locked up the coach.
When I got to it this morning the heater vent was blowing full blast on the exterior of the coach.

Tried pulling the fuse, flipping breaker, turning off main disconnect etc. I pulled the fuse labeled "furnace" and it killed the furnace but also killed my front AC/thermostat.

ACs are both working fine and blowing cold air

Room temperature air coming out of the heater vents on the floor and the exterior heater vent continues to blow room temperature air

??????
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Old 09-09-2017, 10:18 PM   #2
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Whats the ambient temp? Is the thermostat set to heat and at what temp?
If room temp is more than 5 degrees below the setting, the furnace will turn on...it will not just run on heat pump until it gets within 5 degrees of room temp. The fans will also run when you shut the furnace off until the furnace cools down. If none of the above apply, it ain't working right.
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Old 09-10-2017, 02:00 PM   #3
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I concur with Walt. If it the thermostat is NOT calling for heat and the fan is running continuously you likely have a control board issue.

On my Seneca's Atwood furnace I can remove the 4 screws on the outside cover panel, and once the panel is off I can see the control board on the left-hand side of the furnace. It has a small red led on the board that flashes trouble codes when it senses a problem, yours might throw a code to help determine what is amiss.

Mine also has a on/off/reset switch outside under the panel. That switch also incorporates an internal circuit breaker according to my Atwood manual. Although I doubt turning that off then on would change anything, you might need to do that to trigger the control board into running another cycle to display any error codes if there are any. When that switch is off, my thermostats are dead, so they obviously somehow receive their 12-volts from the furnace circuitry. Good to know if the thermostats are dead but the power center fuse is good!
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Old 09-10-2017, 05:29 PM   #4
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I can't check my Seneca because Jayco has it right now but on my former Tiffin the thermostat had a fuse that had to be popped sometimes to reset it as it got messed up. Is there a fuse in the thermostat? Take the fuse out for a couple of minutes and see if that gets you back to normal.
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Old 11-21-2017, 03:06 PM   #5
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Quote:
Originally Posted by TexasSeneca View Post
2016 Seneca with 6k miles on it

Tailgating today and my heating furnace seems to be stuck on

Turned both ACs off last and locked up the coach.
When I got to it this morning the heater vent was blowing full blast on the exterior of the coach.

Tried pulling the fuse, flipping breaker, turning off main disconnect etc. I pulled the fuse labeled "furnace" and it killed the furnace but also killed my front AC/thermostat.

ACs are both working fine and blowing cold air

Room temperature air coming out of the heater vents on the floor and the exterior heater vent continues to blow room temperature air

??????
TexasSeneca I wanted to check and see if you found out what was causing your furnace to keep running, mine is doing the same thing, I pulled the fuse for furnace to shut it off.

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Old 11-21-2017, 06:25 PM   #6
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Perhaps the gas orifice feeding the burner is clogged? Won't ignite yet the fan keeps blowing to meet t-stat demand? Should still be able to turn it off at the t-stat though.


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Old 11-21-2017, 08:17 PM   #7
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I had same problem. The circuit board outside had got wet from heavy rain. Had to replace board and they stood it up instead of it laying down also incase rain blew in again.
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Old 11-21-2017, 08:19 PM   #8
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I also have 2016 Seneca.
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Old 11-21-2017, 08:21 PM   #9
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I tried turning it off with the T-sat and the only way to shut it off is pulling the furnace fuse.


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Old 11-21-2017, 08:34 PM   #10
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In furnace cover outside is a switch that will turn it off and leave A/C heat strip controls on.
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