BAC Forum

General Boards => Technical Support => Topic started by: william harrison on November 07, 2016, 04:30:21 PM

Title: no aqua hot in the bedroom 03 Marquis
Post by: william harrison on November 07, 2016, 04:30:21 PM

 Furnace works fine in the main living area but when I select furnace in the bedroom it blows the 10 amp fuse
that supplies power to the fans in the heat exchangers.  Using an auxiliary battery I was able
to confirm that none of the fans has a short in it; the fuse will also blow with all the fans turned off.

Title: Re: no aqua hot in the bedroom 03 Marquis
Post by: Steve Huber on November 07, 2016, 06:15:05 PM

William,
Need a bit more info (at least I do). Where is 10 amp fuse located? When using a battery, how did you hook it to the fan circuit; at each fan with the original leads disconnected or at the fan switch leads, or? The fuse blows when all fans are off but what is on. What do you turn on to make the fuse blow with the fans off?
Thx, Steve

Title: Re: no aqua hot in the bedroom 03 Marquis
Post by: Gerald Farris on November 08, 2016, 01:10:15 PM

William,
Since the AquaHot system uses a circulation pump for each zone, you may have a shorted circulation pump or at least that is the next thing that I would check.

Gerald

Title: Re: no aqua hot in the bedroom 03 Marquis
Post by: Orman Claxton on November 11, 2016, 04:07:23 AM

Hi William
Give me a call, I see if I can c talk you through some trouble shooting

Title: Re: no aqua hot in the bedroom 03 Marquis
Post by: Fred Brooks on November 11, 2016, 01:26:37 PM

     Hi William,
   I agree with Gerald. If you can access the service area of your Aqua-Hot, try unplugging the zone pumps one at a time to see if the fuse stops blowing. If not then the issue may be in a shorted wire somewhere between the heat exchanger and the aqua-hot
  Regards, Fred

Title: Re: no aqua hot in the bedroom 03 Marquis
Post by: Orman Claxton on November 15, 2016, 06:29:56 PM

OR Maybe a stuck check valve

Title: Hydro hot furnace in bedroom does not work 2006 beaver monterey
Post by: Rhonda Price on November 08, 2017, 05:17:42 PM

Where can we find  to check for a stuck check valve for the furnace that is not blowing heat in the bedroom only cool air living rm works

Title: Re: no aqua hot in the bedroom 03 Marquis
Post by: Steve Huber on November 08, 2017, 06:27:58 PM

Sounds like a zone pump might not be working. You can remove the AH cover and see if the pumps are running. Also check to see if you have a fault indicator  for a pump on the electronic controller panel. The bedroom is probably zone 2 or 3 depending on your AH model. Thermostat is probably OK if fan is running on bedroom heat exchanger.
Steve

Title: Re: no aqua hot in the bedroom 03 Marquis
Post by: Bill Sprague on November 09, 2017, 02:09:29 AM

It is not uncommon for the check valves to stick shut when not in use for awhile.  Firmly tapping on them gets them working again.  The check valves should be easy to find.

Title: Re: no aqua hot in the bedroom 03 Marquis
Post by: Steve Huber on November 09, 2017, 02:24:56 AM

You can find the parts locator in the service manual for your specific unit.   http://www.aquahot.com/Library.aspx
Steve

Title: Re: no aqua hot in the bedroom 03 Marquis
Post by: Bill Lampkin on November 10, 2017, 06:46:14 PM

a centrifugal pump (zone pump) pulls power in proportion to the amount of fluid moving through the pump, i.e., if the check valve is stuck closed, the pump is not pumping fluid and will not have an increase in the amount of current it draws, should not blow a fuse (current) if the check valve is stuck.