question on thermostat and ducts

Stephen_777

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We have a 2024 2600RB which we purchased in Feb 2024. During the camping season, we noticed that the temperature on the thermostat was off by quite a bit. For example, the thermostat might show 80 degrees (F) when the actual temperature is 70 degrees. We asked Grand Design to look at this assuming that the thermostat is bad and should be replaced. They said that the duct work near the thermostat is causing the issue and this issue cannot be fixed without redesigning the duct work. Has anyone else had this problem or have heard of it? It sounds like this is a bad design, and if so, other owners might be having this problem as well.
 
In such a small space it makes it quite difficult to have an accurate reading imo

I am quite sure my 2400 acts the same but what is the difference anyway?
I adjust the heat or ac to meet my needs. What it “says” doesn’t matter to me
 
That's reading further off than our last two RV's but same issue. I don't think many are all that accurate. As @NB Canada suggests, we determine what temp setting feels comfortable and just set it to that. We actually use Govee sensors and placed one just below the thermostat (as well as storage bay, belly, fridge, freezer, outside). The sensors tell us it's 70 and the thermostat reads 76. So, we just know 76 on the thermostat = 70 in the cabin and no issues.
 
Thanks to everyone for their replies. As a new RV owner, I guess I assume that the thermostat would be more accurate, but it looks like another example of how an RV is not like a house/apartment.
 
Thanks to everyone for their replies. As a new RV owner, I guess I assume that the thermostat would be more accurate, but it looks like another example of how an RV is not like a house/apartment.
Yes, you'll find most things in an RV have little resemblance to what we're familiar with in our residences. But hey, you couldn't tow your house all over the country this easily. Haha!
 
We have a 2024 Imagine 2670MK and have the same problem you do. This is only for heat and on both thermostats. Never a problem when switched to AC. Our heat ducts are nowhere near one of the thermostats. Will be really interested in what you find out. Our deal says that's just the way it is. Even tried to charge us to diagnose it because they said there was nothing wrong.
 
We have a 2024 Imagine 2670MK and have the same problem you do. This is only for heat and on both thermostats. Never a problem when switched to AC. Our heat ducts are nowhere near one of the thermostats. Will be really interested in what you find out. Our deal says that's just the way it is. Even tried to charge us to diagnose it because they said there was nothing wrong.
There isn’t anything wrong.
 
We have a 2024 2600RB which we purchased in Feb 2024. During the camping season, we noticed that the temperature on the thermostat was off by quite a bit. For example, the thermostat might show 80 degrees (F) when the actual temperature is 70 degrees. We asked Grand Design to look at this assuming that the thermostat is bad and should be replaced. They said that the duct work near the thermostat is causing the issue and this issue cannot be fixed without redesigning the duct work. Has anyone else had this problem or have heard of it? It sounds like this is a bad design, and if so, other owners might be having this problem as well.
I have the same issue except it's an 8 degree difference. I placed an old mercury thermometer next to the thermostat. The mercury thermostat also shows 8 degrees cooler than the Lippert thermostat.
Lippert products are poorly designed. I have found most of the Lippert components will need to be replaced within a few years.
 
In such a small space it makes it quite difficult to have an accurate reading imo

I am quite sure my 2400 acts the same but what is the difference anyway?
I adjust the heat or ac to meet my needs. What it “says” doesn’t matter to me
X2! I'm my own personal thermostat🌡️regardless of what it reads.
 
We had the same issue with the same model. The dealer didn't know what to do with it. So in my own research I found that the actual sensor is in the AC unit, not the thermostat on the wall. So the reading is at the ceiling. Some commenters recommended keeping the fan on all the time to remedy the situation ... not a good alternative. So, like others above, I have a thermometer and adjust as necessary. As long as the environment is similar, it works. When the weather changes we have to make adjustments.
 
I've done similar research. What I have found is that the sensor for the AC units are in the AC units. The sensor for the furnace is in the wall thermostat. I have no issue with temperature readings when the thermostat is in cool mode, only when it is in heat mode.
 
This sounds like the same exact problem the 2800BH has, the thermostat is located in the plenum just above the filter. You can see if it is your problem goes away by leaving the fan on, see if it matches better. You can also poke the thermostat threw the filter so it hangs out into the room. I relocated it completely, used the extra wires in the harness to relocate it right next to the thermostat on the wall. (There are multiple threads about this problem) I’ll see if I can find one of the threads and update this.


Thermoster Relocation Thread HERE

Another Thread with Thermostat issues HERE
 
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This isn't the problem the the OP and I are having. AC works as is should. Temperature problems are with the furnace only. ONLY when a thermostat is set to heat, the temperature reading on the thermostat is about 10 degrees high.
 
If it is a consistent number I don’t understand why you are worrying about it

If it keeps you comfortable what does it matter what it says?
 
This sounds like the same exact problem the 2800BH has, the thermostat is located in the plenum just above the filter. You can see if it is your problem goes away by leaving the fan on, see if it matches better. You can also poke the thermostat threw the filter so it hangs out into the room. I relocated it completely, used the extra wires in the harness to relocate it right next to the thermostat on the wall. (There are multiple threads about this problem) I’ll see if I can find one of the threads and update this.


Thermoster Relocation Thread HERE

Another Thread with Thermostat issues HERE
I just made the AC thermistor relocation mod on a friends 315RLTS. He didn't like the idea of having to run in AC mode with the fan on all the time. And since he leaves it in FL over the summer, he really didn't want to leave the fan on 24x7 for 7 months. So now he can run his AC on Auto and keep a somewhat even temperature on a warm day. He was fine with the way the heater ran and the temp was controlled.

Furrion expects the fan to run in AC mode. It says so in the instructions. It's why they have one thermistor (temp sensor) in the AC plenum and one in the T-stat for furnace heat.

As for comparing a good thermometer next to the Furrion thermostat.... if there was more than 2 or 3 degrees of variance I would want a more accurate thermostat. No way should the two thermometers be off by anything more.

I have a thermometer next to my Coleman/AirExcel thermostat and they are within 1 to 2 degrees all the time.

One more point.... running a small blade type fan (even on low) in the RV helps distribute the air and produces a more even heating/cooling experience. At least that what I have found over the 'few' years I've been doing this.
 
If you have 2 thermostats, I would just try swapping them. The thermoster for the heat is inside the thermostat, the one for the A/C is inside the A/C Unit.
 

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