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RV-Dreams.com Home -> RV-Dreams Community Forum -> RV Maintenance and Technical Tips -> Why is furnace on?
Post Info TOPIC: Why is furnace on?
cherylbrv


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Why is furnace on?
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We discovered a few weeks ago that our heating system automatically switches over from the heat pump to the furnace when the temps dipped below 30 degrees.  However, it is now about 45 degrees so the heat pump SHOULD be working.  It is not.  Despite being set for heat pump, the heat is coming from the furnace (floor vents).

We did set it to fan only mode and the fan is working, so the problem is only when the blower needs to come on.

Is it possible this can be caused by some kind of obstruction in the roof vents?  We've been parked under a tree for the past 1.5 months.  I'll have Mitch go up on the roof and see if there's an accumulation of leaves up there.  I'd like to think this is the cause of the problem, but the fact that the fan is working, I'm thinking not.

Any other things we can look for?



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TheNewhalls


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Cheryl,

Our heat pump won't come on if there a difference of more than 4 degrees between the inside temperature and the thermostat setting. The furnace will come on instead. try setting the thermostat to within A couple of degrees of the inside temperature. You may have to continue doing that until the temps are in sync or just run the furnace until it catches up.. HTH 



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cherylbrv


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Interesting concept. Next time out - buy a few thermometers to know what the temp is inside the coach! (all we have is the control from the weather station which only tells us what it's like outside).



-- Edited by cherylbrv on Friday 28th of November 2014 01:26:35 PM

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Cheryl B. in her new RV

(well, not new any more! Full timing since 6/25/14)

2008 DRV MS 36TKBS3 (the CoW: Castle on Wheels), 2005 Ford F550 hauler (the Bull)

My blog is http://mitcheryl-rv-journey.blogspot.com/

My business: www.AZAdminSolutions.com
TheNewhalls


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Your thermostat should indicate the indoor temperature. 



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bjoyce


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I would turn off the thermostat, go to the 12 volt fuse box and pull the fuse or fuses for the thermostat and heat pumps. Then put it all back together and see if it now works. This has worked for us in a similar situation and we think a relay or setting might have become stuck.

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cherylbrv


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"Your thermostat should indicate the indoor temperature."

No, I looked. I don't see any numbers there other than the current setting. Here's a picture.  It's a little hard to read, but it says that the fan is in auto mode, 68 is the set point, the mode is heat pump and it's zone 1 (living area).

 



-- Edited by cherylbrv on Friday 28th of November 2014 02:36:02 PM

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Cheryl B. in her new RV

(well, not new any more! Full timing since 6/25/14)

2008 DRV MS 36TKBS3 (the CoW: Castle on Wheels), 2005 Ford F550 hauler (the Bull)

My blog is http://mitcheryl-rv-journey.blogspot.com/

My business: www.AZAdminSolutions.com
TheNewhalls


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If you haven't already, try going to dometic.com under support you should find a manual for your thermostat. 



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Glenn West


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Turn off at thermostat. Hold down mode and zone buttons and turn back on. FF should come on screen. This resets the units. It is like the phones or computers. Need to reboot occasionally.

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cheryls-other-half


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Glenn West wrote:

Turn off at thermostat. Hold down mode and zone buttons and turn back on. FF should come on screen. This resets the units. It is like the phones or computers. Need to reboot occasionally.

 Thanks Glenn.  But we did essentially the same thing (only better/harder?) as suggested by Bill Joyce:

quoted:

I would turn off the thermostat, go to the 12 volt fuse box and pull the fuse or fuses for the thermostat and heat pumps. Then put it all back together and see if it now works. This has worked for us in a similar situation and we think a relay or setting might have become stuck.

 

And it worked.

Except for the fact that the 3 amp (DC) AC fuse fell out of my hand as I was putting it back in and is now RIP (Retired in Place) at the bottom of the fuse box, under the DC fuses (and yes, I did replace it.)

 

WORKED like a charm.



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Camper_Boy


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Hmmm . . . we have that same thermostat and have never encountered this situation. Glad you posted about it . . . if it ever does happen to us, I'll know where to go for the fix!

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bjoyce


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I recommend pulling the fuse since it also powers the 12 volt in the air conditioners/heat pumps as well as the thermostat. I am very glad it worked.

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Bill Joyce,
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Journal at http://www.sacnoth.com
Full-timing since July 2003
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