BAC Forum

General Boards => Technical Support => Topic started by: Paul Champagne on May 10, 2022, 07:20:50 PM

Title: Aqua hot blowing some cold air
Post by: Paul Champagne on May 10, 2022, 07:20:50 PM

Just recently had my Aqua serviced and with this recent cold weather the furnace has been running noticed one of the heat vents is blowing cold air the other 4 are working fine not sure what to look for is it a heat exchanger? Any feedback would be appreciated also front headlight relay seems to be stuck on the circuit board as the low beams only come on when i hit the high beam switch then they are all on so my question is do i need to replace the circuit board?

Thanks

Paul

2006 Beaver Patriot Thunder

Title: Re: Aqua hot blowing some cold air
Post by: Joel Ashley on May 10, 2022, 10:20:45 PM

Admin:  delete

Title: Re: Aqua hot blowing some cold air
Post by: Joel Ashley on May 10, 2022, 10:24:08 PM

Remove the vent cover and see if you can reach and feel the hoses connected to the exchanger, to see if at least one red hose is fairly warm.  If not, then it’s common for a zone pump to have a valve stuck shut. 

I guess from what others have reported here you can gently rap on the back of a pump to jar the valve open.  I’d shut off all thermostats except the one controlling the cold exchanger and leave that one set at say 80.  Then see which pump, located behind the AquaHot’s cover at the bottom front, is “humming”.  That’s the one with an apparently stuck valve, not letting hot fluid through the lines.  Others here that have had to do this may elaborate, and I’ll have to defer the headlight issue as well.

Joel
In the photo, one pump is seen in the lower left with ”Papst” printed on it.

Title: Re: Aqua hot blowing some cold air
Post by: Steve Huber on May 11, 2022, 01:20:40 PM

Paul,
We don't have the 06 Marquis wiring diagrams but from looking at similar diagrams it appears to me that the problem is at the dimmer switch. That is the only place where the high and low beam circuits are joined. Otherwise they are separate circuits. Pg 28 of the 2004 Patriot Thunder wiring diagrams in Coach Assist shows the headlight circuit that I think is applicable to your coach.
Steve

Title: Re: Aqua hot blowing some cold air
Post by: Scott Shearer on May 11, 2022, 09:45:48 PM

Paul,

Please refer to your original December post where I provided information about the headlight circuits for your 2006 Patriot Thunder and troubleshooting suggestions. I will add some additional information and a better image of PCB 8.

-Scott

Title: Re: Aqua hot blowing some cold air
Post by: Keith Moffett Co-Admin on May 12, 2022, 12:15:15 AM

Hi Paul
I can’t help with the headlights much.
Your Aqua Hot is probable the AHE100-04-S.  The check valves can get gummed up as Joel mentions.  Find the Hot line that isn’t hot as it passes through the top of the AH box.  Give that fitting a light rap or two.
I hope that does it for you as the pumps are not available and replacing with the new design means new hoses and draining the system.  The new pumps are not cheap.
Also, we replaced just the bad pump and flushed the system adding all new fluid.  Now we have a different one going bad.  Should have put all new in.

Title: Re: Aqua hot blowing some cold air
Post by: Paul Champagne on May 12, 2022, 03:05:04 AM

Ok gang will try the tap the valve to see if thst helps on the headlights I had someone test the circuit board and it sounds lije the relay is stuck will have to play around with that