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Old 08-07-2012, 06:07 AM   #1
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Thermostat won't light up

Our thermastat won't light up to come on. We have a 05 Alpine 36 FDDS. We have checked all the fuses, unless there is some other ones that we don't know about. Any ideas?

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Old 08-07-2012, 06:15 AM   #2
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If your t-stat is working and your A/C is cooling well it might just be your light bulb in t-stat.

Replace t-stat .

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Old 08-09-2012, 11:11 PM   #3
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If you replace your thermostat, you need to make sure it is compatible with both boards in the AC units. The boards in the units also have to match each other.

I was looking forward to installing the newer designed t-stat (cuz they're cool) and then found out it would cost a few hundred more for the unit boards. Yikes!
2003 Alpine 40FDTS (400HP)
Long Beach, CA
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Old 08-10-2012, 10:16 AM   #4
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If you can find someone w/the same t-stat, borrow theirs, swap it in for yours (easy wiring) & see if you get the same symptom. If yes, then its not the t-stat, its something else in the HVAC system.
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
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Old 08-19-2012, 12:42 AM   #5
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Ken - What brand and model t-stat do you have?? I cannot remember what our is, and coach is far away, but if you take off the front cover, some of them have a slow blow fuse inside there. Take out the old fuse, mark it with a sharpe so you know its the old one and even if it test good and go to radio shack and get a few spares. Then put in one of the new ones and see if the system light up. Now if it does not have a fuse, then it might have a burned out led light, possible, not often but it happens. The LED board might be bad as well.

On some occasions if I push the buttons on ours too fast, the T-Stat, locks up, and I have to remove that fuse for about 5 minutes so the system wakes up. So I have learned not to push them too fast and it works all the time now. Since ours is an APEX and has the 15K heat pumps and HH unit, ours may not be like yours, but check for that fuse, lots of t-stats have them.
Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech
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Old 10-07-2012, 05:40 PM   #6
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This msg is for Monty, the certified RV tech. My furnace, heat pump and AC all seem to be dead. Is it possible that the thermostat is responsible?
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Old 10-07-2012, 06:22 PM   #7
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First what year and model of coach is yours. Then send me a personal message with your e-mail so we can discuss it off line so we dont clutter up this forum.

If you are sure you have 120V AC power, and or 12V DC power and the inverter is providing 120V AC and no fuses and or circuit breakers are tripped/blown. Then there is one thing you can try.

The thermostat cover comes off, and under that cover should be a slow blowing fuse, that fuse might have blown. Regardless, take it out, buy a couple of spares, (radio shack would have them or any good electrical supply house), then put a new fuse in to see if the system has come back. What mine does if I go too fast using the buttons is the brain gets confused and the only way to clear it up is to pull that fuse for 5 minutes or so. See if that works.

The other thing you can do is to turn off the power to the coach, turn off the master switches and give it a minute. This resets all the brains in all the computer circuits throughout the MH and that sometimes brings thing back as well. I will wait for the PM as mentioned above and we will see what we will see.
Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech
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Old 10-08-2012, 12:20 PM   #8
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Don't mean to respond with the obvious but, oversights can happen. Are you engine and house disconnect switches both on?

'01 Alpine 36 FDDS
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