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Old 06-13-2013, 08:14 AM   #1
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Adjusting DUO-THERM Sensors - Can I?

My temp sensors consistently read out 4-5* lower than the actual temp. As an example, if the temp in a zone is actually 79*, the thermostat says it is about 74-75*.

Is there a way I can adjust the thermostat to correct it?

(WOW...that has to be the shortest posting I have made in a LONG time.
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Old 06-13-2013, 09:06 AM   #2
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Quote:
Originally Posted by Sky_Boss
My temp sensors consistently read out 4-5* lower than the actual temp. As an example, if the temp in a zone is actually 79*, the thermostat says it is about 74-75*.

Is there a way I can adjust the thermostat to correct it?

(WOW...that has to be the shortest posting I have made in a LONG time.
Interesting. Will look forward to answers. Are you sure the benchmark thermometer is properly calibrated? How many thermometers do you have? I may need to go buy some.

Actually - good question Don. I have not checked mine. Have you taken temps at the same level as the sensors. I think they are those little plastic things that are on the wall that appear to have no purpose. I do know you pretty well so I assume you have taken the readings at the exact location of the sensors. :
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Old 06-13-2013, 09:18 AM   #3
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Morning Steve,

In both zones I have a clock devices the also read temps. They tend to read about 4-5* warmer than the Duo-Therm Comfort Control is set at. That is both in the AC and Heating mode. That tends to suggest that there is some kind of calibration issue. I did Email Dometic but I don't expect a reply until...well...whenever. LOL

I also have a thermometer directly over both sensors and they also run the same 4-5* difference I see in the temp readouts I have on my clocks in both zones. While the clocks are mounted to an outside wall and perhaps somewhat subject to heat/cold transfer from the outside, they generally are pretty close to the thermometers over the sensors. Yesterday was the first time I saw much of a difference. They were about than a 2* warmer than the thermometers over the sensors. The sensors are on internal walls so they shouldn't have any issues with heat/cold transference.
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Old 06-13-2013, 10:01 AM   #4
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or getting there... I would have replied sooner but was looking for some kind of $5 measuring device that was recommended in your more specific thread.

There has to be a way to adjust / calibrate. Other posts I've seen have always been of the F or C setting and indicated selected by the manufacturer for sale here or to Canada.

Still watching and learning. Hope you get it worked out. Not something I am worried about yet but when we get full time it will be.... But I suspect setting the thermostat will be at the comfort level versus a number on the thermostat for me. I gotta have cool - and will do my best to be where the heat isn't.
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Old 06-13-2013, 10:05 AM   #5
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Quote:
Originally Posted by flaggship1 View Post
or getting there... I would have replied sooner but was looking for some kind of $5 measuring device that was recommended in your more specific thread....
Yep...that Jack is always there with a great suggestion.
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Old 06-13-2013, 11:54 AM   #6
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NOPE...can NOT calibrate.

Actually got a quick answer from Dometic as follows...

Thank you for contacting Dometic. Unfortunately, there is no way to calibrate this for a more accurate reading. With our units there is a possibility for a 2-5 degree difference in the reading with the actual temperature inside your RV.

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Old 06-13-2013, 02:03 PM   #7
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Quote:
Originally Posted by Sky_Boss
NOPE...can NOT calibrate.

Actually got a quick answer from Dometic as follows...

Thank you for contacting Dometic. Unfortunately, there is no way to calibrate this for a more accurate reading. With our units there is a possibility for a 2-5 degree difference in the reading with the actual temperature inside your RV.
Wow. Not sure which is more surprising. You getting a response in a reasonable time - or the fact there is no adjustment. I still say - not a big deal - comfort first - temp reading second.
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Old 07-12-2020, 01:15 PM   #8
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I have the Duo-Therm 2 zone comfort control wall mounted thermostat and if the actual temp is 80 degrees inside my coach, I have to move the thermostat down to 73 degrees before it will kick on the AC. Now that's crazy. What's also crazy is that the thermostat only shows the setting on the digital read out and does not have a function to show what the temperature in the room. Hudson
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Old 07-13-2020, 04:52 AM   #9
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If the thermistor drifts off of value replacing it should make it accurate again. There is one in the thermostat and frequently a remote thermistor for some zones. I just find the temperature setting that is comfortable and use that number, each zone is a little different.

I have a clock in the stick house which happens to have a thermometer. It is mounted on an outside wall and below a HVAC register, thus isn't accurate. I should probably put tape over the display as DW cannot seem to get it in her head that the temp reading doesn't mean anything. It's been there 25 years!
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