Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 12-14-2012, 09:07 AM   #1
Senior Member
DKO's Avatar
Join Date: Dec 2011
Posts: 127
Question Aqua hot - No heat up front

I replaced the control box in the aqua hot the end of November. I put it in, made sure it cycled off and on and then had to leave the bus for two weeks.

The old one is on top and the new one is below. It looks completely different but plugs up the same. I ordered it from Prevost.

I left the thermostats set to come on and instructions for my dad to turn the aqua hot on if the temps went down to a certain level. The weather was nice while we were gone so he did not turn it on.

When we arrived home the low was about 20 that first night so we turned it on. We have electric toe kick heaters and heat strips in the roof airs as well so we do not have to have the diesel heat in the living areas. I run it mostly to heat the plumbing bay and it does get it toasty inside real quick and the other heat sources can maintain from there.

I have two heat exchangers up front controlled by one thermostat behind the drivers seat and two heat exchangers in the back contolled by a thermostat by the bed. The ones in the back work perfectly and the ones in the front blow cold air.

I have not taken the cover off the aqua hot to examine anything yet. I know each zone has a circulation pump and I can feel if the one for the front is kicking on or not once I get down there. I thought I would ask for tips here before I crawled in the bay.

Any chance my new control box is causing this? My dad repaired the relay that was burnt in my old control box so I am tempted to put it back in and see if that solves the problem. I know the front zone was working during a cold snap in Oklahoma in October or November.

Any other ideas or things to check are appreciated.


Home is where you go when there's no place else to go!
DKO is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 12-14-2012, 09:19 AM   #2
Senior Member
Steve Ownby's Avatar
Join Date: Nov 2008
Location: Cosby, Tn
Posts: 6,477
If you have the time, go here and join this forum and ask the question. It's run by Roger Burke, who is one of the best AquaHot techs in the business:


It could be as simple as a stuck check valve. If you can identify the pump for that zone, take a wrench and tap on the check valve in that line. It could also be one of the mechanical relays up on the electrical panel on the upper right of the boiler case.

At any rate, Roger Burke will steer you in the right direction.

Steve Ownby
Full time since 2007
2003 Monaco Signature
Steve Ownby is offline   Reply With Quote
Old 12-19-2012, 03:21 PM   #3
Senior Member
justaroamer's Avatar
Join Date: Oct 2009
Location: Ozarks
Posts: 527
No heat to one zone in most cases is a stuck check valve. Turn on all zones, the cold one is your problem zone, tap check valve with screwdriver handle.
♫ Happy Trails... to You ♪....., Until We Meet Again ♪..... ♫
justaroamer is offline   Reply With Quote
Old 12-20-2012, 03:52 PM   #4
Community Moderator
"007"'s Avatar

Nor'easters Club
Workhorse Chassis Owner
iRV2 No Limits Club
Join Date: Oct 2004
Posts: 27,840
Here is a thread on Aquahot operation there is more info in QT's 1 & 2.
98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans, now in good hands
"007" is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 11:34 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.