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Topic: Aqua Hot suddenly doesn't start ?? (Read 566 times) previous topic - next topic

Aqua Hot suddenly doesn't start ??

Turned on the Aqua hot diesel switch at the sink; light stays on for ~20 seconds then turns off.  Tried several times w/shore power and w/generator power, same result.  Cannot find any explanation in my paperwork thus far.
Fiddler
1959 Parris Island grad
40' 2001 U320 Build 5875
1999 Suburban K1500 toad
1986 Corvette Pacecar
ssoftail@comcast.net

Re: Aqua Hot suddenly doesn't start ??

Reply #1 –
Hi Fiddler,

There can be several causes for failure to run. Igniter coil, flame  sensor, and the controller box are most common. Low tank fluid and thermostats also are common culprits. Recently replaced components probably could be excluded. The trouble manual gives a flow tree to help diagnose these items.
An Aqua Hot service tech such as Rudy Legett would be of significant help.
Jim
Jim Frerichs
2002 U320 42'

Re: Aqua Hot suddenly doesn't start ??

Reply #2 –
Hi Fiddler,

Jim knows more than he's letting on about the Aqua Hot...aka expert in my opinion. Esp on the electronic side of thing. It was great to be traveling with him on the Alaska motorcade.

Question?  Does the fan come on for the 20 seconds after you turn the switch on...and there is then no ignition?  Or does the exhaust fan not even turn on ?
Gary
Gary & Gwen
2002 U320 4010 Tag
Build #6032
2014 Jeep Wrangler
Motorcade # 17430

Re: Aqua Hot suddenly doesn't start ??

Reply #3 –
Fiddler,

The burner is failing to fire and is faulting.  It is telling you it has faulted by turning off the light in the interior switch.  Many reasons for the burner to fault but the number one fix is servicing the burner giving it a new nozzle in the process.

Can you service the burner?
Rudy Legett
2003 U320 4010 ISM 450 hp
2001 U320 4220 ISM 450 hp
1995 U320 M11 400 hp
1990 Granvilla 300 hp 3208T
Aqua Hot Service Houston and Southeast Texas

Re: Aqua Hot suddenly doesn't start ??

Reply #4 –
And a new A H fuel filter.
Laurel Hill, FL
 To do is to be---- Nietzsche
  To be is to do-----Kant
  Do be do be do----Sinatra

Re: Aqua Hot suddenly doesn't start ??

Reply #5 –
If I can locate some instructions,  I'll give it a shot Rudy.  I think I can handle changing the nozzle and new filter.  Where is the best place to get the kit to do this?
Fiddler
1959 Parris Island grad
40' 2001 U320 Build 5875
1999 Suburban K1500 toad
1986 Corvette Pacecar
ssoftail@comcast.net

Re: Aqua Hot suddenly doesn't start ??

Reply #6 –
Found some instructions on Beamalarm but cannot figure out how to print it?  anybody?
Aquahot and Hydrohot Annual Service
Fiddler
1959 Parris Island grad
40' 2001 U320 Build 5875
1999 Suburban K1500 toad
1986 Corvette Pacecar
ssoftail@comcast.net

Re: Aqua Hot suddenly doesn't start ??

Reply #7 –
Search this site it has good information and sells parts.

Activity Stream - RV Hydronic Heater Forum
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Aqua Hot suddenly doesn't start ??

Reply #8 –
Found this helpful youtube video on servicing the aqua hot.  posting here hoping it's useful to others as well.  Thank you all for your prompt replies.  Will look at the recommended sites for the parts to service it.

https://www.youtube.com/watch?v=9p5T6ixogEk
Fiddler
1959 Parris Island grad
40' 2001 U320 Build 5875
1999 Suburban K1500 toad
1986 Corvette Pacecar
ssoftail@comcast.net

Re: Aqua Hot suddenly doesn't start ??

Reply #9 –
Quote from: Fiddler –
Found some instructions on Beamalarm but cannot figure out how to print it?

If on a win 10 pc open menu then select print.  on mine the print screen opened blank until  clicking "simplify" along top. Then able to print, or so it appears.

Hope this helps.
2019 Pleasure Way Lexor

Re: Aqua Hot suddenly doesn't start ??

Reply #10 –
Just a follow up since I started this thread; hope this might help others;  Luckily, not sure what the fix was, nonetheless, Aquahot now works since the following was performed..............
 
Pulled the access panel and checked the fuses.
None were tripped; so I removed and cleaned the fuse contacts and reseated them
Jiggled the 3 relays and reseated them
Jiggled some of the wires and reseated the 2 plug connectors at the base of the square silver colored box. Buttoned everything up, went into the coach, took a chance with my fingers crossed and hit the switch and the AH started and ran normally (initially smoked pretty bad for about 2 minutes; then stopped smoking and eventually the AH ran its course then shut off.  Hot water was as normal in the motorhome.
Again, not sure what solved the problem nor how long it will stay solved.   
I will get the annual service done.  While it looks easy enough, the cramped quarters and expected abuse to these old joints won't survive.   
Fiddler
1959 Parris Island grad
40' 2001 U320 Build 5875
1999 Suburban K1500 toad
1986 Corvette Pacecar
ssoftail@comcast.net
 

Re: Aqua Hot suddenly doesn't start ??

Reply #11 –
Hi Fiddler,

I'm glad you did the "magic trick" and it started. FYI several components can be on the edge of failing and work sporadically, sometimes varying with heat or cold conditions of the Aqua Hot. This is especially true of the control box, the ignitor coil and the flame sensor. It is easier to repair once a component fail completely.  The number of other causes are numerous and often a challenge to find.
Yearly maintenance is a really good idea.
Jim

2002 U320
Jim Frerichs
2002 U320 42'