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Old 10-06-2022, 11:12 AM   #1
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Furnace help

Out on a little jaunt. 2005 36mdds
Furnace worked fine in all the pre trips. Get up this morning and it's alittle cold. Go to fire up the Furnace, nothing. I have propane and
it's on. Fuse is good. Any help??
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Old 10-06-2022, 11:23 AM   #2
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Nothing as in No Fan ?
OR
Nothing as in Fan but no flame/heat?

Brand/Model of Furnace?

12VDC+ from a fused source is at furnace waiting for DC to return from thermostat (that fused source also sends DC TO the t-stat)
T-stat closes and DC goes back to furnace to allow the Fused DC to Fan Motor

Fused source...bad fuse
On/Off CB Switch at furnace could be tripped.
BLO circuit on circuit board bad
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Old 10-06-2022, 12:15 PM   #3
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Yup, let us know EXACTLY how far into the run cycle it got:


Fan started?
Hear ignitor clicking/gas valve opening?
Flame?
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Old 10-06-2022, 12:42 PM   #4
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I get nothing. Maybe a click. Set temp to 90. Might be a Duo Therm? No markings I don't see a breaker on the unit. Fuse appears good. I'll get the volt meter out.
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Old 10-06-2022, 01:40 PM   #5
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Appears to be a suburban made furnace. Has a Duo Therm tstat.
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Old 10-06-2022, 02:02 PM   #6
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Have you been running the A/C? If A/C is on for one of the zones, heat will not come on.
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Old 10-06-2022, 11:07 PM   #7
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Quote:
Originally Posted by Jeff and Cheryl View Post
Have you been running the A/C? If A/C is on for one of the zones, heat will not come on.
So I went back to this this evening. .zone 1 set to 75 degrees on furnace. Zone 2 has no option for furnace. So I shut it off. Still no furnace action.

I tell ya the longer I have this coach the more complicated everything gets.
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Old 10-07-2022, 12:12 AM   #8
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Zone 2 is AC and fan only. Now if per chance you have heat pumps, I'm not familiar with how they figure into all this.
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Old 10-10-2022, 10:47 AM   #9
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UPDATE: When I was doing the trailer brake controller, I came across wire that appeared to be an after thought or possibly for the toad brake control.So I cut it. Turns out at some point and time the 12v wire for the furnace was re routed. I found another source and got it going again.
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Old 10-10-2022, 11:49 AM   #10
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Carpenters Motto ------ measure twice before cutting

Electricians Motto ----- ID the wire before cutting




Glad you found the 'issue' and got furnace working
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