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12-15-2022, 09:34 AM
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#1
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Senior Member
Join Date: Oct 2012
Posts: 215
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Aqua Hot Issue
We have a 2021 FW Discovery LXE with an Aquahot 400. While in storage, we simply leave the unit plugged in, to keep batteries charged etc. There is a "whirring" sound coming from the AH. Sounds like a pump to me. Why is it doing this? And short of unhooking all batteries and leaving it sit, what do i do? We are in Canada and need the batteries to stay charged in the winter. I suppose i could shut off the breaker for the AH, but that won't fix the problem.
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12-15-2022, 09:38 AM
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#2
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Senior Member
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 9,874
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Take the cover off the front of unit and feel the pumps.
A pump running for no reason will just prematurely wear it out.
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Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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12-15-2022, 09:57 AM
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#3
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Senior Member
Winnebago Owners Club
Join Date: Sep 2012
Posts: 262
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You may want to check if your basement heater is on.
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2014 Winnebago Tour 42QD
2008 Jeep Liberty
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12-15-2022, 09:58 AM
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#4
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Senior Member
Join Date: Sep 2018
Posts: 416
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Check to see if you have a thermostat on, don't forget about bay heaters and the engine preheat. That would cause the circulation pumps to run.
You are correct, the AH and AH control systems are on 12V, so turning off 120V breakers does not help.
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Richard Entrekin
07 Prevost Marathon XL II
Maverick Hybrid Toad, Inverness Fl
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12-15-2022, 11:26 AM
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#5
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Senior Member
Join Date: Oct 2012
Posts: 215
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This unit has a master switch for the AH that is in the "off" position. Can't say i know if this unit has a thermostat in the basement. And not sure if it overrides the master in the coach itself.
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12-15-2022, 02:51 PM
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#6
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Senior Member
Join Date: Apr 2018
Posts: 3,608
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Stir pump or basement heat. Make sure you have the thermostats off of furnace in the coach and the one in the basement turned all the way down. Electric heat and diesel heat switches on off.
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2004 Dynasty 4
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12-16-2022, 06:41 AM
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#7
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Senior Member
Join Date: Feb 2013
Posts: 576
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My basement heater is controlled by a button thermostat in the water bay. When it gets below 40 ish degrees it turns on the fan and stir pump. I put a switch before the thermostat so both would not run. Other motorhomes have had a regular setable thermostat. It is there just find it.
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2002 Beaver Marquis Emerald C-12 Cat 505 HP towing 2004 Honda CR V with 300K on clock
2014 Volvo 630 Heren Bed ET Hitch SOLD
2017 New Horizons Majestic 35 foot SOLD
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12-16-2022, 07:12 AM
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#8
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Senior Member
Fleetwood Owners Club Freightliner Owners Club
Join Date: Nov 2006
Location: Raleigh, NC
Posts: 427
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Quote:
Originally Posted by slate
This unit has a master switch for the AH that is in the "off" position. Can't say i know if this unit has a thermostat in the basement. And not sure if it overrides the master in the coach itself.
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Slate, your coach does indeed have an analog t-stat to control heat for the basement... It is hidden in the wet bay behind the panel just above the faucet of the outside shower. It should be set from the factory at 40 degrees, but I have heard others with the same coach with different settings. I relocated my t-stat to outside that panel so I could access it.
The basement heating unit, or "Cozy" should be mounted to the ceiling in the bay just forward of the wet bay.
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Duane & Claudine Miller
Raleigh, NC
2020 Fleetwood Discovery LXE 40M
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12-16-2022, 08:38 AM
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#9
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Senior Member
Entegra Owners Club Spartan Chassis Jayco Owners Club RV Trip Wizard
Join Date: Apr 2020
Location: roaming
Posts: 227
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That is what was happening to ours, the basement thermostat was set really high, so the unit would run even if we had the power "gas" switch turned off...
Ours is a analog Coleman Mach thermostat down there that I wish I could swap with a bluetooth enabled digital thermostat and be able to change via my phone app.
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12-16-2022, 08:57 AM
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#10
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Senior Member
Join Date: Oct 2012
Posts: 215
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Thanks for all the replies. "New to us" unit and om's quite vague on some of this. I did locate that thermostat, but with the lowest setting being 19F, it would still cut in. On another thread owners of the same coach with AH 400's are saying that if the burner and the electric element are"off" in the display, and check that it is not heating, this would override where the thermostats are set. Basically nothing in the AH unit should run if burner/element are in "off" position. Dealers up here don't know how these systems operate, so i gave up talking to them.
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12-16-2022, 10:44 AM
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#11
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Senior Member
Winnebago Owners Club
Join Date: Sep 2012
Posts: 262
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You could test that thermostat. If you hear a click as you turn it to a lower setting, then it should be working properly. I don't think the pump will run if you turn-off the main coach power switch. On my coach the batteries still charge with the main coach power switch off. I'd call Fleetwood and ask them if the AH basement heat is wired so it's always on. Are you getting heat in the storage bay where the thermostat is? If not, this could be an issue with the AH, however, I've never heard of a pump running without circulating the anti-freeze.
__________________
2014 Winnebago Tour 42QD
2008 Jeep Liberty
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12-16-2022, 11:13 AM
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#12
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Senior Member
Join Date: Oct 2012
Posts: 215
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No heat in the basement. Burner and electric element are off. Just pump 2 running constantly.
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12-16-2022, 11:19 AM
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#13
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Senior Member
Join Date: Apr 2018
Posts: 3,608
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Quote:
Originally Posted by slate
Thanks for all the replies. "New to us" unit and om's quite vague on some of this. I did locate that thermostat, but with the lowest setting being 19F, it would still cut in. On another thread owners of the same coach with AH 400's are saying that if the burner and the electric element are"off" in the display, and check that it is not heating, this would override where the thermostats are set. Basically nothing in the AH unit should run if burner/element are in "off" position. Dealers up here don't know how these systems operate, so i gave up talking to them.
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Then that pump lite on the main board has to be lit. You can disconnect the wire for the pump at the board until you figure it out.
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2004 Dynasty 4
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12-16-2022, 01:40 PM
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#14
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Senior Member
Join Date: Oct 2012
Posts: 215
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Quote:
Originally Posted by shootist
Then that pump lite on the main board has to be lit. You can disconnect the wire for the pump at the board until you figure it out.
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Even if the main board shows the AH as turned off, diesel and electric?
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