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Old 12-23-2009, 09:04 AM   #1
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Aqua Hot Control Unit

Well, once again, Aqua Hot problems. just had to replace the high limit sensor and still wont fire up. Local repair guy (factory trained) thought it might be the control unit. So he replaced it with his and burner fired up. When he replaced mine and gave it a "slap", it too fired up.
So, apparently one of the relays in the unit is hanging up. Question: has anyone found a source for "rebuilt" units? Or can the box be opened and the bad relay "fixed"? New one is $770.
Looks like I can leave the system case open and go slap the control unit when it hangs up, but don't know how long this will last until the relay goes totally kaput.

David Horn, TX; 2014 40ft Phaeton QTH; 2014 Mazda CX5; 2013 Can-AM Spyder RT-S on TandemTow trailer; Traveling with Ringo (an English Cocker)
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Old 12-23-2009, 09:34 AM   #2
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Originally Posted by dshogman View Post
Well, once again, Aqua Hot problems.
dsogman, if you're lucky, Roger Berke will see your post and respond to you regarding your issue. If he doesn't, he is also the moderator of a Yahoo Hydronic Heating Group discussion located at:

HydronicRVHeating : Hydronic-RV-Heating

You will have to join to become part of the group. Possibly you can reach him that way.

Good luck!

Dr4Film ----- Richard.

2002 Monaco Windsor PBT 40Ft. (R HOME) - 30Ft. 2006 Pace Trailer (R JUNK). Trailer Has 06 VUE (R TOWD) 04 Victory Alen Ness Edition (R RYDE). Full-Timer for 14 Yr's BUT now a Part-Timer. Cummins ISC-350 With Banks Power Pack and Upgraded PRXB PacBrake.
Winter Home in Flagler Beach FL - Now Staying in Dansville NY for the Summer.
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Old 12-23-2009, 09:41 AM   #3
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RE: Aqua-Hot Control Box


Unfortunately there is no source for rebuilding the control boxes that I know of and no one that I know of has successfully repaired one.

There are several online sources for the control boxes. Search for “RV Hydronic Heater Parts”

- Roger Berke -
HydronicRVHeating : Hydronic-RV-Heating
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Old 12-23-2009, 11:32 AM   #4
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Which in my book means you have nothing to lose, once you've figured out how to work around the disabled unit for the time needed to crash & burn an attempted repair and obtain a new board if your fiddling comes to naught.

If you can figure out which relay, it should be a cinch to get a new one. You can figure the coil ohms w/you ohm meter. Voltage is probably marked on it, along w/switching sense (SPST or SPDT). Now all you need is somebody who thinks he can unsolder/solder, and roll the dice. Might turn out its not that relay, but an associated component w/an intermittent issue. Might also turn out he solders like I do, and your board gets meat-axed into garbage; usually this kind of thing is a one shot deal.
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Old 12-23-2009, 01:35 PM   #5
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I purchased a new 267-292 control box from, Webasto Thermosystems in October of 2006 for $356.31 (I just looked at my receipt) . You might give them a call and see what they are now.
Wayne & Kathy
05 Alpine 40FDQS #75330 Towing 24' car hauler, 2012 Spyder, 2003 Harley FatBoy
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