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Old 05-21-2016, 09:05 AM   #1
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Join Date: Apr 2015
Posts: 277
FYI: Aqua-Hot circulating pumps

In sorting through the many problems we have encountered with our new (to us) 2006Apex 40MDTS, one of them has been a bad circulating pump in the Aqua-Hot. Our first indication of a problem, was that we weren't getting hardly any hot water at the faucets, either on diesel power, or electric. We had a very good RV mechanic check it out while we were in Junction City, where we bought the coach, and he diagnosed the problem. It seems that the pump that controls heat for the front area of the coach, also provides heat to the potable water heat exchanger. Of course, that pump is now ob-solete, and he had no new style ones in stock. We now have a new style pump in hand to install, so for those of you who may be facing a pump re-placement, here is the "kit part number:" PLE-100-905-FRU, from Aqua-Hot TSB (technical service bulletin)#S-169, title:450/500 Pump Retrofit. Hang onto this info, as it will save you some grief in the future. You will get lots of stuff in the kit, as it pretains to all three pump locations, and you will need only some of the included parts. The instructions are very com-plete, read them carefully.
Oh, and I still haven't solved the problem of my inoperative jacks... it's driving me nuts.
Dudley (Dudley Do-Right)
2006 Apex 40MDTS
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Old 05-21-2016, 12:27 PM   #2
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Alpine Owners Club
Join Date: Apr 2007
Location: Edmonds, WA
Posts: 829
Many people have found this site helpful: RV Hydronic Heater Repair - Home Not sure of the part of the country you are in but there is a HWH tech in the Salem, OR area named Joe Elwell. He started his career at Camping World installing HWH systems. He then moved on to WRV installing HWH systems. He now works for HWH installing and servicing HWH systems. Oh, he also worked for Silverleaf too working on the HWH / Silverleaf interface. Would you like his contact info?
Janet and Todd Legg
2006 Alpine Apex M-40FDQS #75594
2014 Honda CRV w/navi
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Old 05-21-2016, 12:38 PM   #3
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Holiday Rambler Owners Club
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After reading some of the posts on the entegra forum regarding issues with the new style AH pumps, I'm praying my originals live a long happy life !!
Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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Old 05-21-2016, 02:53 PM   #4
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Todd I would like Joe's contact info. It would be good information to keep handy.

Rick T
2006 Alpine 34FDDS
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Old 05-25-2016, 07:12 PM   #5
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Location: Auburn, CA, Havasu, AZ & Mulege, BCS
Posts: 5,341
I had a zone not operating properly. Pump was running but no hot circulating. There is a brass check valve just above each zone pump, I tapped on it & Voila! heat came on.
If one of my pumps craps out, I'm going to try a PC CPU overclocking coolant pump. Several of them have the same output specs and cost around $50.
Or else I'm going to drive south.
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
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