Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 11, 2025 ...

AQUAHOT (COZY HEAT EXCHANGER) WONT COME ON FOR ZONE 1 AND 2

September 06, 2020, 12:39:57 pm

I need help with my heating zones, I have the aquahot and inside I have 3 zones for heat and 3 acs on roof, So this happened last year already and I cant seem to find the problem, last winter I used jumper wires on the aquahot to get zone 1 and 2 to work, I jumped them from zone 3, What does not work is zone 1 and zone 2 on the heat side of aquahot only, The ac zones all work in cool and on the heat pumps, Zone 3 works on the aquahot for heat. I have chased wires and grounds, I thought maybe it was the control board on the ACs  front and middle but replaced front ac board with a spare and same issue so I am rethinking that the boards may be bad, any help would be greatly appreciated, I understand that the thermo zones are ground but the cozy heat fans require  power at same time the thermo kicks the aquahot relays on so is my issue a relay for each of the zones bad?  Again any help would be greatly appreciated.

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Re: AQUAHOT (COZY HEAT EXCHANGER) WONT COME ON FOR ZONE 1 AND 2

Reply #1 – September 06, 2020, 12:51:39 pm

On your thermostat what are you using to call for heat on zone 1 & 2? Do you have it calling for furnace not heat pumps?

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Reply #2 – September 06, 2020, 12:53:56 pm

Yes the furnace side of zone 1 and 2 does not turn the aquahot on or the cozy heat exchangers, zone 3 works in the bedroom only

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Reply #3 – September 06, 2020, 12:54:45 pm

The heat pumps work as does the ac on all zones

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Reply #4 – September 06, 2020, 01:02:13 pm

I had a similar problem and it turned out I had the zones set on auto which I had to turn off.

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Reply #5 – September 06, 2020, 01:18:35 pm

On mine when you put thermo on furnace the auto option doesnt show up on the display, it only shows in cool and heat pump mode

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Reply #6 – September 06, 2020, 01:29:55 pm

No heat pumps on mine, but an option to change furnace to Aqua Hot.
Maybe Rudy will chime in as Aqua Hot is his business.

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Reply #7 – September 06, 2020, 01:44:41 pm

I may be overthinking, but are the contact relays for zone 1 & 2 (a) pulling into contact without jumpering the wires, (b) are the wires on those contacts hooked up properly. When I rebuilt my AH this spring, the fans on zones 1 & 2 wouldn't shut off unless I took the relays out. Turns out, I had put one of the wires on the wrong terminal by mistake. Just guessing, but maybe a thought.

Larry

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Re: AQUAHOT (COZY HEAT EXCHANGER) WONT COME ON FOR ZONE 1 AND 2

Reply #8 – September 06, 2020, 05:45:26 pm

Larry i do not think that the wires are connected wrong as when I put jumper wire on it all works as it should other then the temp control is whatever is registered from the bedroom temp. I  am totally stumped, looked at all the wiring diagrams and cant find issue. in my opinion it would have to be a ground issue or a relay but am clueless at this point, like i said I have been chasing this gremlin for a year now so need advise from the pros,

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Reply #9 – September 06, 2020, 07:13:27 pm

Adam,  Been busy today and fixed a heater too.

Now, if you have placed a ground jumper on the terminals on the top of the heater marked Living Room, Bathroom, Bedroom and the fan coils have produced warm air, then the Aqua Hot is fine.  As you have suggested, there is a dip switch on the front A/C that allows the inside room thermostat to talk to the heater.  Sounds to me that the stat is not talking to the heater.

So, suggestion is to verify the A/C board dip switch is in the proper position.  Sorry to be of so little help.

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Reply #10 – September 06, 2020, 07:47:50 pm

Can you get the thermostat to show furnace on all 3 zones? If not then it could be the dip switches on zone 2 and 3 circuit boards

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Reply #11 – September 06, 2020, 09:46:14 pm

Thanks for the suggestions, Yes the thermostat shows the furnace zones

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Reply #12 – September 07, 2020, 05:23:01 pm

I might suggest you do a reset on your thermostate.  You need to push in Mode & Zone buttons, hold them in and then turn the on off switch back on and this does the reset and see if the zones don't work then.  I had to do this when it failed to allow heat pumps to work again.  Like Rudy suggested, you need to check your dip switches and make sure they are in the correct selection.

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Reply #13 – September 13, 2020, 02:00:59 pm

I finally figured out it was 2 new relays that I replaced when this all started, replaced them again and all works, I never had this happen before and dont know why 2 relays would be bad. Thanks Adam

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Reply #14 – September 13, 2020, 02:03:10 pm

Not all relays are created equal. /Did you check to see if the contacts were jumping the same terminals?

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