Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
 


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 05-11-2021, 11:29 PM   #1
2 Rivet Member
 
2021 27' Flying Cloud
Salado , Texas
Join Date: Sep 2020
Posts: 54
2 zone thermostat - sensor error

We have a 2021 27'FC. It was equipped with the Dometic thermostat mounted in the bedroom and a remote sensor mounted on the refrigerator bulkhead behind the dining TV. This is a 2 zone thermostat used to control two heat pumps, forward and aft.

The problem we are seeing as the first warm weather begins for us and the camper is that the refrigerator enclosure gets fairly warm (easily 90). The dining sensor mounted in the refrigerator bulkhead is reading 78 when the space temp is about 65.

Has anyone else encountered high tstat readings for the dining zone?
Gtx Eng is offline   Reply With Quote
Old 05-12-2021, 07:02 AM   #2
4 Rivet Member
 
twbucksr's Avatar
 
2015 22' FB Sport
2018 27' Flying Cloud
Currently Looking...
Currently Looking...
San Antonio , Arkansas
Join Date: Oct 2015
Posts: 264
Its not an error. Your bulkhead sensor is picking up the heat generated from your tv.

We have been full time for several years now and thru trial and error, this is how we typically set the a/cís up in the summer....

We have programmed our zones so that the unit over the bedroom (smaller capacity of the 2) runs during the day and the living room unit runs at night. This is done because the smaller unit will have to run longer to meet the set point which removes more moisture thus providing better comfort and efficiency.

On days when both units will need to run, we have the set point of the living room unit set 2 degrees higher so it only comes on when the bedroom unit canít maintain set point and then both units are running at the same time.

We put a small fan on the bed to help move the air around during the day and move the fan to the base of the table leg at night.
twbucksr is offline   Reply With Quote
Old 05-22-2021, 12:04 PM   #3
1 Rivet Member
 
2021 25' Flying Cloud
Poulsbo , Washington
Join Date: Sep 2020
Posts: 6
Yes! I was just looking into this today. 2021 FC 25RB with dual A/C units. Our furnace is in the same zone (2) that is wired to the temp sensor that reads high. When we first used the furnace weíd alternate between comfortable and freezing all night and I suspect this is the cause, or at least a contributing factor.

Right now, I have the trailer plugged in to 20A 110v shore power, and the fridge is on A/C. No heat sources have been active for a couple of days. Outside temp is 50F and inside zone 1 reads 54F but zone 2 is at 69F.

It seems like a huge design flaw to have the temp sensor in the refrigerator enclosure.

I am thinking that a quick fix would be to swap the sensors for zone 1 and zone 2 at the thermostat head unit. Or possibly just disconnect the second sensor so that everything reads from the one zone (not sure if thatís how it works). I am doubtful that multi zone sensors are needed in a tiny space with a single air volume.

Longer term that sensor needs to be relocated from the fridge cabinet.
canuck_in_wa is offline   Reply With Quote
Old 05-22-2021, 07:15 PM   #4
1 Rivet Member
 
2021 25' Flying Cloud
Poulsbo , Washington
Join Date: Sep 2020
Posts: 6
I ended up cutting a notch in the white cover and pulling the remote sensor wire through so that itís sticking out a few inches. Itís now reading about 3 deg off from a reference thermometer.

The factory had just tied a knot in the wire so that it wouldnít slip back into refrigerator cabinet, then covered it with the white slotted cover. I suspect that there is heat transfer happening from the cabinet to the cover due to everything being in close proximity and the sensor tip touching the cover.

I taped a bushing onto the wire so that it wouldnít slip back into the cabinet. Also taped a piece of cardboard to the TV so that it doesnít get direct sunlight (will have to adjust that later so itís shaded on 3 sides).

The sensor does not seem to like having anything in contact with the final few inches of the wire. I originally had a bit of tape on there and it seemed to throw the reading off.

Iím planning to recheck tomorrow morning before the sun gets too high.
canuck_in_wa is offline   Reply With Quote
Old 06-04-2021, 12:43 PM   #5
2 Rivet Member
 
2021 27' Flying Cloud
Salado , Texas
Join Date: Sep 2020
Posts: 54
Finally just had to pull mine apart. It was as described. Three sensor was reading 90f and the heat pump would never cycle off. The refrigerator bulkhead is very warm, the refrigerator is running in auto electric mode, but does the same on LP. The cable feed directly beneath the sensor plays a large part in the inaccuracy.

The system began running properly within minutes of pulling the sensor out into free air.

So how do you get the teleportations down in the refrigerator compartment?
Gtx Eng is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Thermostat Temp Sensor Error Brennec02 2016 - Current Classic (all lengths) 2 05-05-2021 08:46 AM
Thermostat Temp Sensor Error Brennec02 General Repair Forum 0 05-02-2021 09:14 AM
Zone 2 AC Works Great, But Not Zone 1 Alumaholic Furnaces, Heaters, Fireplaces & Air Conditioning 21 02-14-2021 06:12 PM
Which one is zone 1 and zone 2? Doc Foster Furnaces, Heaters, Fireplaces & Air Conditioning 9 06-23-2017 10:52 PM
Can I run the furnace in one zone and the heat pump in the other zone? Philip Jones Furnaces, Heaters, Fireplaces & Air Conditioning 2 04-15-2017 03:24 PM


Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.



All times are GMT -6. The time now is 09:57 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.