Front AC Problem

[drifter56w]

Recently we have been having a problem with the front AC unit on our 40' Alpine Coach. The unit runs on high fan even though the stat is set to run on low fan. Doesn't seem to make a difference if we set the fan to Auto or the Mode to fan only. When the coach cools down to the stat setting the fan will go on low. The rear unit works fine .................

Bad stat ????

[EngineerMike]

Drift- welcome to the show. You can add your coach year, length, model, color, style of window treatments and the year you met as sweethearts to your "signature line" by clicking on User CP at upper left. That way your stats will always appear in each post, so a) you don't have to repeat that, and b) folks have a better basis on which to respond, and 3rd) we get to know & remember you(r coach).

Could be the stat; mine is easy to change- it has a phone type RJ11 plug on back. If you had a spare or one you could borrow from another coach it is an easy swap to see if that solves it.

[Dick D]

If the interior is hot, then mine will run on high until the temperature gets within about 5 degrees of the set temperature. Then it will kick back down to low fan.

I think they designed them this way to help them cool down faster. The low setting is a lot quieter, but if it's really hot then the air conditioner needs some serious air movemet. Cold air is much harder to move than hot air

[takepride]

Ditto here. Mine always runs on high until it gets close to the target temperature. You might call Duo-Therm and ask before changing parts out.

I'll need to check about the Fan Only part. I've never used that function, too noisy. The ceiling fans work better, too.