Happened to me.
Originally Posted by wilsodf
I had my heater quit one night and nothing worked, no blower, no response of any kind. It was totally dead. I never could figure it out,
I had Colonial Airstream trouble shoot it and they found that the cable that went from the thermostat to the AC on the roof 1st, then the unit communicates to the heater. It was the cable that looks like a phone cord. There was some corrosion where the phone plug connects to the AC. Once corrosion cleaned off and re-connected, the heater fired right up.
Has worked ever since. That was 18 months ago.
Agree, this is a likely source for the problem. Check your 30 amp breaker first though. Reset it just for drill. Heck, reset all your breakers and inspect and reseat all of your fuses just for drill. Just because a fuse "looks" good doesn't mean it is. Check voltage or swap new fuses from your box-o-spares (any auto store will sell you an assorted pack for a couple of bucks).
No joy? It is either the thermostat itself or the connection in the overhead AC unit. If the thermostat light works and the display does anything, Its time to take the inside cover off the AC unit (recessed Phillips head screws - 4 to 8 depending on installer's mood that day).
Look for the phone cable (probably on same side as your stove, may be tied up with a cable tie so that the connection doesn't fall into a drain cup and short out [as my earlier model year did!] and plug is probably NOT covered in shrink wrap [as any sane person does who has had this problem, and doesn't want a repeat]. Anyway, turn the thermostat OFF, click the jack open and look and feel it. Any hint of dampness, your hairdryer is your friend - use LOW heat. The jack wires are tiny so a flashlight and magnifying glass may be needed to see corrosion. Crossed up or shorted wires are unlikely, because it isn't like a wired headset jack that is frequently plugged or unplugged. If it is wet and the copper is still shiney, merely taking it apart, drying both ends thoroughly with WARM air should clear the problem. A very soft baby tooth brush can remove corrosion but brush with the grooves in the plugs, and go easy. If the jacks are badly corroded, clean as well as possible, and work the plugs in and out several times. The jacks are somewhat fragile so go easy. Turn on the thermostat and retry... remembering that it will take 10 seconds or more for anything to turn on.
If the thermostat is dead and dark, the wire between the AC and the thermostat could be the problem, so pull the front off the thermostat and check it.. The jack could have been installed wrong years ago (broken lock tab) and finally vibrated loose. If you've any kind of corrosion back there it would be extremely weird (shower fiberglass cracked or.kids with squirt guns?) Even with a broken tab, attacking it back in and using a snippet from a Command strip should hold it almost forever.
Eventually a broken jack plug can be snipped off and replaced. (I can easily replace jacks because I owned a call center. Operators were notorious for spilling stuff on headsets, not to mention what a fired staffer could do in 2 seconds!). It is fussy to learn and do just because the wires are so small, and some equipment does need reversed pairs, so a "make do" repair should be good til spring.
If re-seating the plugs doesn't work, I would bet on the thermostat having failed before wondering how the wire failed behind a wall, and you can buy an identical thermostat online. $100 maybe?
CAUTION: You could test the phone wire by running another phone cord with RS232 jacks on each end from the AC to the thermostat while the covers are off, but first call Airstream or a trusted mechanic to verify that the original wiring is standard!!! Do no harm!
Still betting the problem is wet wire behind AC cover.
Good luck. Paula