« previous next »
Pages: [1]   Go Down

Author Topic: loss of power to thermostat  (Read 3658 times)

Bob Reeves

  • Guest
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?
Logged

Frank Bergamo

  • BAC Member
  • *
  • Posts: 309
  • Thanked: 87 times
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.
Logged
Frank & Paulette Bergamo
2018-       : 2007 Marquis Topaz IV  C-15 600 HP Allison 4000
2014-2018: 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

  • BAC Member
  • *
  • Posts: 1251
  • Thanked: 349 times
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.
Logged
2005 Patriot Thunder Lexington, 3 slides
40' tag axle (short wheelbase)
525 hp C13

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

Bill Lampkin

  • BAC Member
  • *
  • Posts: 1251
  • Thanked: 349 times
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
Logged
2005 Patriot Thunder Lexington, 3 slides
40' tag axle (short wheelbase)
525 hp C13

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

Bill Lampkin

  • BAC Member
  • *
  • Posts: 1251
  • Thanked: 349 times
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
Logged
2005 Patriot Thunder Lexington, 3 slides
40' tag axle (short wheelbase)
525 hp C13

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

Robert Wagner

  • Guest
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. 
Logged

Joel Ashley

  • BAC Member
  • *
  • Posts: 2446
  • Thanked: 768 times
  • OSU Class of '73, Oregon Native. RVing 40 years
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
Logged
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

  • Guest
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.
Logged

Bob Reeves

  • Guest
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.
Logged
Pages: [1]   Go Up
« previous next »