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PostPosted: Thu Dec 07, 2017 2:24 am 
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Joined: Fri Feb 03, 2017 11:11 pm
Posts: 25
OR Year: 2017
OR Model: OR 297RLS
Member ID: ORF-11842
I have a strange issue with my furnace or thermostat. The colder it gets outside, the higher I have to set my thermostat to keep it at 70 degrees. The furnace seems to cycle on and off as it should, but the thermostat setting has to change when it gets colder? At first, since the thermostat is under my kitchen cabinets, I thought heat was collecting there and keeping the thermostat warmer than the surrounding area. I mounted a little usb powered clip on fan to blow air across the thermostat and it seemed to help. Today, temps are dropping closer to freezing and I have to have the thermostat set at 78 to get 70. Earlier today, setting it at 72 got me 70. It acts like the thermostat is sensing the temperature from somewhere else besides the thermostat itself..., like near the furnace and I may have an air leak?? I'm at a loss. Anyone?

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PostPosted: Thu Dec 07, 2017 10:11 am 
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Joined: Mon Sep 09, 2013 1:53 pm
Posts: 1389
Location: Bayfield, CO
OR Year: 2014
OR Model: RF316RLS
Member ID: ORF-3628
Where are you reading 70? The thermostat or another thermometer location?

Do you have single or double pane windows?

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2011 F350 PS CC LB 4x4 SRW
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PostPosted: Thu Dec 07, 2017 3:03 pm 
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OR Year: 2017
OR Model: OR 297RLS
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TedS wrote:
Where are you reading 70? The thermostat or another thermometer location?

Do you have single or double pane windows?


I have a thermometer mounted on the wall, compared that to a infrared gun, and a professional oven temp sensor I use for work. It's right next to the thermostat, so that's where I'm reading 70 degrees but it seems I have to adjust my thermostat setting depending on how cold it is outside, (the only common denometer I can attribute to the change).

I have single pane windows with reflectix taped to it. That wouldn't make any difference though. If it's an insulation factor thing, my furnace would just run longer and/or more often.

I'm starting to think that maybe it's just the thermostat failing (only 6 months old). Right now, it's 40 degrees outside, my thermostat is set to 73, and it's showing 70 degrees on the thermometer next to the thermostat. Last night, it was about 33 degrees, and I had to set the thermostat to 78 to get the same 70 degrees on the thermometer next to it.

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2018 Open Range Light 297RLS
2014 RAM 1500 4x4 standard cab, short bed, black express
Airlift air bags with internal jounce bump and onboard compressor
Goodyear Endurance tires including spare :woohoo


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PostPosted: Thu Dec 07, 2017 5:24 pm 
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Joined: Sun Jul 31, 2016 7:29 am
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Location: SW Missouri
OR Year: 2017
OR Model: 297RLS
Member ID: ORF-10355
It could be that it's just not sensing the same room temp as your room thermometer.

"To display the Inside Temperature, the Single Zone LCD thermostat must be in the Off Mode.
Press either the “+” or “―” button to display the Inside Temperature.

You can also adjust the temperature differential from 2 degrees to 1 degree and see if this helps:

"To set the temperature differential the system must be Off.
Press the “―” button and, while holding it, also press and hold the On/Off Mode button for three seconds.
Release the On/Off Mode button, then release the “―” button.
Press the “+” button to toggle between “d1” and “d2”
“d1” for 1 degree F differential, and “d2” for 2 degrees F differential"

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PostPosted: Fri Dec 08, 2017 8:35 am 
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Location: Bayfield, CO
OR Year: 2014
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Are all the outlets blowing air? Maybe a duct hose dropped off.

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2011 F350 PS CC LB 4x4 SRW
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PostPosted: Mon Dec 11, 2017 12:35 pm 
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Joined: Fri Feb 03, 2017 11:11 pm
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OR Year: 2017
OR Model: OR 297RLS
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offroad wrote:
It could be that it's just not sensing the same room temp as your room thermometer.

"To display the Inside Temperature, the Single Zone LCD thermostat must be in the Off Mode.
Press either the “+” or “―” button to display the Inside Temperature.

You can also adjust the temperature differential from 2 degrees to 1 degree and see if this helps:

"To set the temperature differential the system must be Off.
Press the “―” button and, while holding it, also press and hold the On/Off Mode button for three seconds.
Release the On/Off Mode button, then release the “―” button.
Press the “+” button to toggle between “d1” and “d2”
“d1” for 1 degree F differential, and “d2” for 2 degrees F differential"



I can follow your logic except the temperature "sensing" and "differential" of the thermostat should be a constant. It appears to change throughout the day, depending on how cold it is outside. It works fine all day while set at 72, my other thermometers read 70, (so it's generally 2 degrees off). But, when the sun goes down, and the temperature drops in the evening, that's when I get cold, check the thermometer, and it's holding around 67 ish. I crank up the thermostat to 75 or 76, and then it holds the temperature at 70 again. If there were a sensing bulb associated with it, and THAT was located, say near the furnace, I would suspect a air leak from outside, or lack of insulation in that area..., but this thermostat should be sensing temperature at the thermostat, so outside temp shouldn't be making such a difference. Like I said in the original post. I'm at a loss. Even if the thermostat itself is failing, why fail only in the evenings when it gets colder outside??

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2018 Open Range Light 297RLS
2014 RAM 1500 4x4 standard cab, short bed, black express
Airlift air bags with internal jounce bump and onboard compressor
Goodyear Endurance tires including spare :woohoo


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PostPosted: Mon Dec 11, 2017 12:38 pm 
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Joined: Fri Feb 03, 2017 11:11 pm
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OR Year: 2017
OR Model: OR 297RLS
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TedS wrote:
Are all the outlets blowing air? Maybe a duct hose dropped off.



Ducting is fine. It's a problem with having to readjust the thermostat in the evenings after the sun goes down. During the day, I set it at 72, and it maintains 70. In the evening, when it gets colder outside, I have to readjust the thermostat upwards to around 76 or so, to maintain 70. That wouldn't be a duct issue.

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2018 Open Range Light 297RLS
2014 RAM 1500 4x4 standard cab, short bed, black express
Airlift air bags with internal jounce bump and onboard compressor
Goodyear Endurance tires including spare :woohoo


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PostPosted: Mon Dec 11, 2017 1:09 pm 
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Joined: Mon Sep 09, 2013 1:53 pm
Posts: 1389
Location: Bayfield, CO
OR Year: 2014
OR Model: RF316RLS
Member ID: ORF-3628
It could be a duct issue if not enough hot air is entering the cabin requiring you to increase the temperature of what air does enter the cabin to compensate for the increased heat loss when the sun goes down.

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2011 F350 PS CC LB 4x4 SRW
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