Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
 

Go Back   Thor Forums > Thor Motorcoach & Motorhome > Class A Motor Coach
Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 09-29-2022, 10:38 PM   #1
Junior Member
 
Brand: Thor Motor Coach
State: Florida
Posts: 22
THOR #26840
Aqua Hot 400D Operation for Heating Interior/Floor

2014 Thor Tuscany 40RX - I have read, watched everything I can find on how to operate this Aqua Hot 400D. I cannot get the aqua hot heat exchangers inside to turn on the fans. I have tried the Electric & Burner switches inside. I have no faults. The A/C Thermostat has 3 zones when switching to Heat it shows Electric & Gas as an option, but only on Zone 1 & 3. I have turned on both the tank and storage thermostats. nothing I can find or do makes the heat exchanger fans turn. Can anyone point me in the right direction?

__________________
cmikego74 is offline   Reply With Quote
Old 09-30-2022, 02:28 AM   #2
Member
 
Brand: Thor Motor Coach
Model: Chateau 24F
State: Arizona
Posts: 83
THOR #20184
Call Aqua Hot : 1-800-685-4298
__________________
2018 Chateau 24 F
Skip500 is offline   Reply With Quote
Old 09-30-2022, 12:39 PM   #3
Senior Member
 
Brand: Thor Motor Coach
Model: Tuscany 42GX
State: Missouri
Posts: 943
THOR #9178
Tank thermostat is ?

Turn on diesel burner switch, must stay on with pilot lit

Switch thermostats to gas

Set temperature above ambient

Zone pumps activate

Heat from hot glycol activates snap disk starting Exchanger fan
__________________
Never confuse education with intelligence
lwmcguir is offline   Reply With Quote
Old 09-30-2022, 12:48 PM   #4
Senior Member
 
Brand: Thor Motor Coach
Model: Tuscany 42GX
State: Missouri
Posts: 943
THOR #9178
Quote:
Originally Posted by cmikego74 View Post
2014 Thor Tuscany 40RX - I have read, watched everything I can find on how to operate this Aqua Hot 400D. I cannot get the aqua hot heat exchangers inside to turn on the fans. I have tried the Electric & Burner switches inside. I have no faults. The A/C Thermostat has 3 zones when switching to Heat it shows Electric & Gas as an option, but only on Zone 1 & 3. I have turned on both the tank and storage thermostats. nothing I can find or do makes the heat exchanger fans turn. Can anyone point me in the right direction?
The thermostat or control at the Aquahot is the tempering control for domestic hot water

Two thermostats in the basement are for the exchangers located there
__________________
Never confuse education with intelligence
lwmcguir is offline   Reply With Quote
Old 09-30-2022, 01:56 PM   #5
Member
 
First RV 4 me's Avatar
 
Brand: Thor Motor Coach
Model: 40KQ
State: Oklahoma
Posts: 83
THOR #24608
400D here. I had a hard time with mine at first aswell. Hope I can help,
Close to the main unit you should have a controler box. Look to see if there are any fault lights lit. If so, use a paperclip (Hang one on something to always have one) to reset the fault. The reset is in the hole about 1-2 inches.
Do you have hot water ? I should have asked that first...
__________________
First RV 4 me is offline   Reply With Quote
Old 10-01-2022, 01:01 AM   #6
Senior Member
 
Brand: Thor Motor Coach
Model: Tuscany 42GX
State: Missouri
Posts: 943
THOR #9178
Mike is awol
__________________
Never confuse education with intelligence
lwmcguir is offline   Reply With Quote
Old 10-01-2022, 01:05 AM   #7
Member
 
First RV 4 me's Avatar
 
Brand: Thor Motor Coach
Model: 40KQ
State: Oklahoma
Posts: 83
THOR #24608
Did I miss something
__________________
First RV 4 me is offline   Reply With Quote
Old 11-15-2022, 02:02 PM   #8
Junior Member
 
Brand: Thor Motor Coach
State: Florida
Posts: 22
THOR #26840
Quote:
Originally Posted by lwmcguir View Post
Mike is awol
Sorry guys, my wife went into hospital early October and passed away on October 10th.
I was finally able to get it figured out, had an issue with fuel nozzle and filter gummed up, it would run but wasn't burning properly, had fuel dripping form exhaust pipe. New nozzle and filter fixed that.
FOR OTHERS wanting to know about Tuscany 40rx - The interior thermostat when switched to HEAT only has GAS (Aqua Hot) setting on Zone 1 & 3 which operate the floor heat exchangers so I turned off Zone 2 completely. There is also a Thermostat in my storage compartment to heat underneath. (Guessing that is really the Zone 2)
It took me some adjusting to figure out some good settings, but so far it is all working fine. Thanks for everyone's help
__________________
cmikego74 is offline   Reply With Quote
Old 11-15-2022, 02:33 PM   #9
Senior Member
 
Brand: Thor Motor Coach
Model: Tuscany 42GX
State: Missouri
Posts: 943
THOR #9178
Quote:
Originally Posted by cmikego74 View Post
Sorry guys, my wife went into hospital early October and passed away on October 10th.
I was finally able to get it figured out, had an issue with fuel nozzle and filter gummed up, it would run but wasn't burning properly, had fuel dripping form exhaust pipe. New nozzle and filter fixed that.
FOR OTHERS wanting to know about Tuscany 40rx - The interior thermostat when switched to HEAT only has GAS (Aqua Hot) setting on Zone 1 & 3 which operate the floor heat exchangers so I turned off Zone 2 completely. There is also a Thermostat in my storage compartment to heat underneath. (Guessing that is really the Zone 2)
It took me some adjusting to figure out some good settings, but so far it is all working fine. Thanks for everyone's help
Mike, sorry about your wife passing

Zone 2 is really the recirculation loop to act as a stir pump since the 400 doesn't have a dedicated unit. You should feel heat in the exchanger but no fan when the unit is recirculating after you turn it on and it warms up. 450D units have a dedicated stir pump.

And you should have two thermostats and two exchangers in the basement, any way the 43 foot and up do
__________________
Never confuse education with intelligence
lwmcguir is offline   Reply With Quote
Old 11-15-2022, 07:10 PM   #10
Member
 
First RV 4 me's Avatar
 
Brand: Thor Motor Coach
Model: 40KQ
State: Oklahoma
Posts: 83
THOR #24608
CmikeGo

Very sorry Mike. My thoughts are with you as are Prayers.
Mike and Cat
__________________
First RV 4 me is offline   Reply With Quote
Old 11-17-2022, 01:57 PM   #11
Junior Member
 
Brand: Thor Motor Coach
State: Florida
Posts: 22
THOR #26840
Quote:
Originally Posted by lwmcguir View Post
Mike, sorry about your wife passing

Zone 2 is really the recirculation loop to act as a stir pump since the 400 doesn't have a dedicated unit. You should feel heat in the exchanger but no fan when the unit is recirculating after you turn it on and it warms up. 450D units have a dedicated stir pump.

And you should have two thermostats and two exchangers in the basement, any way the 43 foot and up do
I have a regular thermostat AND a turn dial next to it in basement. But it doesn't seem like the one for the tanks turns on, not sure which one controls that. Or if the one by tanks is even working, there is a sensor with an orage cap on it near tanks, but I don't hear that heat exchanger run. Need to do some testing
__________________
cmikego74 is offline   Reply With Quote
Old 11-17-2022, 03:10 PM   #12
Senior Member
 
Brand: Thor Motor Coach
Model: Tuscany 42GX
State: Missouri
Posts: 943
THOR #9178
Quote:
Originally Posted by cmikego74 View Post
I have a regular thermostat AND a turn dial next to it in basement. But it doesn't seem like the one for the tanks turns on, not sure which one controls that. Or if the one by tanks is even working, there is a sensor with an orage cap on it near tanks, but I don't hear that heat exchanger run. Need to do some testing
Sounds like most Tuscany coaches. Both exchangers are up high in the rails and you should feel them warm up if the thermostats are calling for heat.

Aquahot has to be heated up and circulating via zone 2, half bath before either will kick in.

I usually set them around 50 degrees when were in below freezing temperatures
__________________
Never confuse education with intelligence
lwmcguir is offline   Reply With Quote
Old 11-17-2022, 03:23 PM   #13
Junior Member
 
Brand: Thor Motor Coach
State: Florida
Posts: 22
THOR #26840
Quote:
Originally Posted by lwmcguir View Post
Sounds like most Tuscany coaches. Both exchangers are up high in the rails and you should feel them warm up if the thermostats are calling for heat.

Aquahot has to be heated up and circulating via zone 2, half bath before either will kick in.

I usually set them around 50 degrees when were in below freezing temperatures
All the interior heat exchangers are working. Under dash drivers feet, under dinette table, half bath vanity, bedroom drawers, master bath vanity, and the center main basement. Aquahot is both in Burner & Electric switch on.
Just need to figure out the control or tstat sensor for tank area
__________________
cmikego74 is offline   Reply With Quote
Old 11-17-2022, 10:22 PM   #14
Senior Member
 
Brand: Thor Motor Coach
Model: Tuscany 42GX
State: Missouri
Posts: 943
THOR #9178
Quote:
Originally Posted by cmikego74 View Post
All the interior heat exchangers are working. Under dash drivers feet, under dinette table, half bath vanity, bedroom drawers, master bath vanity, and the center main basement. Aquahot is both in Burner & Electric switch on.
Just need to figure out the control or tstat sensor for tank area
Turn zone 2 on and see if your basement heat comes on, thermostats set several degrees above the ambient
__________________
Never confuse education with intelligence
lwmcguir is offline   Reply With Quote
Old 11-17-2022, 10:26 PM   #15
Senior Member
 
Brand: Thor Motor Coach
Model: Tuscany 42GX
State: Missouri
Posts: 943
THOR #9178
That is turn Zone 2 on to gas heat and be sure the thermostat is turned up calling for heat

Then go check your basement thermostats and registers to see if your heating
__________________
Never confuse education with intelligence
lwmcguir is offline   Reply With Quote
Old 11-17-2022, 10:30 PM   #16
Junior Member
 
Brand: Thor Motor Coach
State: Florida
Posts: 22
THOR #26840
Quote:
Originally Posted by lwmcguir View Post
That is turn Zone 2 on to gas heat and be sure the thermostat is turned up calling for heat

Then go check your basement thermostats and registers to see if your heating

My zone 2 only has elec on thermostat. I think it's already directly wired to basement. I just need to figure out if sensor for tanks is bad. The heat exchanger in basement works
__________________
cmikego74 is offline   Reply With Quote
Old 11-17-2022, 10:34 PM   #17
Senior Member
 
Brand: Thor Motor Coach
Model: Tuscany 42GX
State: Missouri
Posts: 943
THOR #9178
Quote:
Originally Posted by cmikego74 View Post
My zone 2 only has elec on thermostat. I think it's already directly wired to basement. I just need to figure out if sensor for tanks is bad. The heat exchanger in basement works
Maybe the difference in two and three heat pumps. I set mine all to gas heat when running the basement heat and switch when temps are higher to the three heat pumps

Be interesting to see what you find. Maybe just use your multi meter and be sure the thermostats are sending a signal for heat
__________________
Never confuse education with intelligence
lwmcguir is offline   Reply With Quote
Old 11-25-2022, 12:05 AM   #18
Junior Member
 
Brand: Thor Motor Coach
State: Florida
Posts: 22
THOR #26840
UPDATE - While on the road to a new campground my aqua hot stopped working and started buzzing all the time. Had a RV mobile Aqua Hot service technician come out. Turns out the control relay box went bad. Put a new one on and it turns out this thing operates totally different. Evwr since I bought it and turned on Aqua Hot the burner and pumps ran all the time. Now it actually cycles like it is suppose to.
__________________
cmikego74 is offline   Reply With Quote
Old 11-25-2022, 12:15 AM   #19
Member
 
First RV 4 me's Avatar
 
Brand: Thor Motor Coach
Model: 40KQ
State: Oklahoma
Posts: 83
THOR #24608
$$control card $$

Sure is nice when they work correctly. I still cant get my front zone to work correctly. Did the annual service and no change. Didn't expect it to but... Calling AquaHot monday in hope they can help me. No odd noise's and no fault lights. If I can make it till summer I plan to go to the factory and get other big things replaced or fixed.
Glad to hear you got your heat fixed Mike
__________________
First RV 4 me is offline   Reply With Quote
Old 11-25-2022, 03:00 AM   #20
Senior Member
 
Brand: Thor Motor Coach
Model: Tuscany 42GX
State: Missouri
Posts: 943
THOR #9178
Quote:
Originally Posted by First RV 4 me View Post
Sure is nice when they work correctly. I still cant get my front zone to work correctly. Did the annual service and no change. Didn't expect it to but... Calling AquaHot monday in hope they can help me. No odd noise's and no fault lights. If I can make it till summer I plan to go to the factory and get other big things replaced or fixed.

Glad to hear you got your heat fixed Mike
Is your zone 1 pump running when you selct heat, gas, on zone 1, and have the thermostat calling for heat?

What is the antifreeze temperature?

Burner cycling on and off?
__________________
Never confuse education with intelligence
lwmcguir is offline   Reply With Quote
Reply

Thread Tools
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

Disclaimer:

This website is not affiliated with or endorsed by Thor Industries or any of its affiliates. This is an independent, unofficial site.




All times are GMT. The time now is 05:04 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 PL2