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Old 10-15-2009, 02:21 AM   #15
Senior Member
Alpine Owners Club
Join Date: May 2008
Location: Vancouver, WA
Posts: 2,226
Jerry, I don't know as anything short of a replacement thermostat will fix the disparity you have between what you set it for and what you are receiving as heat goes. I am sure someone more familiar with the components of your year/model can point you in the right direction for a new one. You might see if there is a small battery in it, powering it and change that, as it might have one, doubt it, but you never know for sure. Also, make sure there is no dust blocking any air vents in it, as it also may have a local temp sensor inside it, comparing the sensors in the ceiling to the one built in, or they might be fighting for control. Or it may be just the way it works. I would find this annoying, and try to figure out why, what, and even purchase another one to check.

Buuuuttttttt - Here is my tail about the propane detector going off in the morning when we were using our 5th wheel.

After the second trip we made in our New to us Alpenlite 5th wheel and plugged into shore power at the 30A service, at around 1:00AM every morning we would be camping, the propane detector would go off, scare the living Cr****P out of us, and I would have to go down, and take it from the wall, and pull one of the wires powering it. It was powered from a 12V source. The first time it happened, I ran out and turned off the propane tanks, making sure we did not have any sparks or open flames present. It never happened during the day, and I checked for leaks spraying soap on every connection in the propane system, and the DW has the best noses around and never smelled gas. We struggled with this for several trips until a friend of mine, reading a forum post in another area of this site, remarked, that I might have a bad battery or even maybe more than one, which was causing the issue. So we had the batteries load tested, and it turned out all four of them had at least one dead cell apiece. We purchased new batteries, I put them in, and the propane detector never went off again, unless we pushed the test button.

So, take the time to have your batteries checked, as that may (slight maybe) be the reason you have a disparity between what you set it for, and what it reads. I make no guarantees on this either, but 12V systems, running within, and around 120V systems can do funny things, especially if the batteries are marginal or even bad. You won’t know it, because you have the genset running or the shore power hooked up, but, all the systems except the microwave, Residential Refrigerator, and TV’s are powered by 110V, everything else is on 12V from the batteries, and then the Xrantrex inverter/charger is keeping those charged up.

Now, here is my thermostat tale as well. On our coach, if you change Zones or modes within that zone to quickly using the push button, the thing seems to trip off line the display goes to 00 and won’t take any input period. It just like loses its brain. The only way to get it back is to pull the fuse inside it. Sometimes we have to let the thing sit for 10-15 minutes with the fuse out of it before it wakes up correctly. I have learned to go real slow in switching zones or modes and that keeps it from losing itself. I was thinking it was marginal and getting ready to fail.

But now, after relating the story above, I’m thinking it may be the same issue we had before, Batteries. When we took delivery, the electrolyte level in every cell in each battery was below the top of the plates. So I need to check them, and I need to figure out how to do this. I have a hydrometer, and believe 1240 is the magic number of specific gravity I am to have if I am sure they are charged up. I will do this once we have stopped for a few days, and the charger is running. Then I will cut the coach power off, pull the shore power and check each cell. If I don’t get the number I’m supposed to get, we can stop and get it verified by a good shop.

Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech
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