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Author Topic: loss of power to thermostat  (Read 2425 times)

Bob Reeves

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loss of power to thermostat
« on: August 19, 2019, 10:53:54 PM »
07 Patriot thumder.
rear thermostat which on AC selects either bedroom or center Air conditioner. worked yesterday.  today worked for a while then quit. no power to thermostat. front working OK.  thermostats are on 12 V. are there fuses?  would the two thermostats be on separate circuits?  Any ideas?
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2007 Beaver Patriot Thunder
45 ft  Cat C-13 525 HP
2019 Chevy Traverse
DW  Betty Jo.

Frank Bergamo

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Re: loss of power to thermostat
« Reply #1 on: August 19, 2019, 11:01:23 PM »
Bob,
On my 2002 Marquis, there is an inline fuse under the AC cover topside.
 Hope this helps.
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Frank & Paulette Bergamo
2019-       : 2007 Marquis Topaz IV  C-15 600 HP Allison 4000
2014-2019: 2002 Marquis Emerald C-12 505 HP Allison 4000
2004-2014: 1986 Executive Diplomat 3208 250 HP Allison MT-643
Grand Junction, CO.

Bill Lampkin

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Re: loss of power to thermostat
« Reply #2 on: August 19, 2019, 11:02:29 PM »
Try a 'reset' of the thermostat. Assume you have the original 5 button t-stat? I can't remember  the exact procedure (some help!) but it involves turning off the power to the t-stat (switch under bottom, I think) and holding two buttons down for a few seconds. I'll try to search for the procedure. Your '07, is the tstat controlled by the multiplex system? Different can of fish, there.
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2005 Patriot Thunder Lexington, 3 slides
40' tag axle (short wheelbase)
525 hp C13

"Goin where the weather suits my clothes..."

Bill Lampkin

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Re: loss of power to thermostat
« Reply #3 on: August 19, 2019, 11:03:45 PM »
Simultaneously depress and hold the MODE and ZONE push-buttons while turning the ON/OFF switch to "ON". FF should appear in LCD display until the mode and zone push-buttons are released
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2005 Patriot Thunder Lexington, 3 slides
40' tag axle (short wheelbase)
525 hp C13

"Goin where the weather suits my clothes..."

Bill Lampkin

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Re: loss of power to thermostat
« Reply #4 on: August 19, 2019, 11:04:51 PM »
Dometic troubleshooting guide: http://bryantrv.com/docs2/docs/ccc5.pdf
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2005 Patriot Thunder Lexington, 3 slides
40' tag axle (short wheelbase)
525 hp C13

"Goin where the weather suits my clothes..."

Robert Wagner

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Re: loss of power to thermostat
« Reply #5 on: August 19, 2019, 11:39:58 PM »
We had same problem.  It was a fuse and someone in here helped us with it.  The fuse was in the bathroom under the breakers. Don’t know where yours are but I would check that first. .  By the way it also worked out awning. 
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Joel Ashley

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Re: loss of power to thermostat
« Reply #6 on: August 20, 2019, 02:31:05 AM »
See my photo in this thread:
http://beaveramb.org/forum/index.php/topic,9193.msg62896.html#msg62896

Thermostats on fuse #8 on our coach.

Joel
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Joel and Lee Rae Ashley
Clackamas, Oregon
36.9 ft. 2006 Monterey Ventura IV, aka"Monty Rae"
C9 400HP Cat
The following users thanked this post: Frank Bergamo

Bob Reeves

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Re: loss of power to thermostat
« Reply #7 on: August 20, 2019, 03:50:41 AM »
Frank & Bill &
Thanks for the prompt replies.
Have tried the reset per your instructions also checked the Dometic procedure ( the same). no result. will check to see if there is any incoming voltage. have not been up on top yet. also had read that there could be a fuse on a circuit board on the AC unit.
as the thermostats are on 12 V i have checked all 12 v fuses.
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2007 Beaver Patriot Thunder
45 ft  Cat C-13 525 HP
2019 Chevy Traverse
DW  Betty Jo.

Bob Reeves

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Re: loss of power to thermostat
« Reply #8 on: August 20, 2019, 03:54:56 AM »
left coach for about 4 hrs. when i returned, i turned it on and it worked!  could it have frozen up and shut off?  any thanks for your suggestions.
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2007 Beaver Patriot Thunder
45 ft  Cat C-13 525 HP
2019 Chevy Traverse
DW  Betty Jo.
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