Troubleshooting AquaHot 450D With Hot Water But No Heat
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- เผยแพร่เมื่อ 15 ก.พ. 2019
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Certified Mobile RV Technician, Darren Koepp, takes you along as he changes the heat pumps on an AquaHot 450D on-demand RV water heater.
If you are in need of RV Repairs in the Olympic Peninsula area of Washington state, submit a service request on our website at myrvworks.com today!
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I have never seen a better explanation of the AquaHot System! Nicely done!
I'm an RV Tech and I've learned more from your videos than I have from my shop and RVTI combined. As a matter of fact, I don't know if I would be able to pass RVTI lvl 2 without your videos.
Darren: your instruction style is wonderful. You break everything down in an easy-to-follow method taking the "fear of the unknown" out of the process comfortably. Thank you so much.
You ROCK Darren! My Family and I are FT Rv'ers and you have saved us more times than you can imagine!! Have anyone ever had a case of all 3 pumps indicator lights all on at the same time?
You the man Darren! My very first 450D system I had to replace the two pumps plus the summer/stir pump and did it flawlessly with your guidance. Thank you very much and keep up the good work.
I am so glad I found this video, I had this exact problem when my 450d would make hot water and no heat. It was 25f outside when it failed. I called the folks at Aqua Hot and they helped me troubleshoot the system and bypass the command circuit in the coach, the pumps were good but the circuit board just got stupid. After I jumped the signals the system started working and hasn't failed again. Go Figure. It was great to find a video explaining what the components are and where they are located.
You are awesome! I have been having issues with my Aquahot 450d not igniting and after watching your videos I was able to fix it myself. However, now have hot water but no heat inside. I'm thinking my check valves are clogged so tomorrow I'll try knocking on them. This whole thing is frustrating because I paid good money to have an annual service dinner in Palm Springs just 3 months ago. Note that I've disassembled the Aquahot, I can guarantee that the guy robbed me and only changed the fuel nozzle and filter. The inner combustion chamber was absolutely filthy and a bunch of build up carbon. It was nasty. Anyway. Hoping I can figure out my heating issue tomorrow. Keep on with your videos, they are amazing. I live in Whidbey Island, wish I was closer to you. Thank you.
3+ yrs later and I just now find your channel. Super informative stuff. Great job.
I just took delivery of a Tiffin Phaeton 40 IH with Aqua Hot 450 D. Your video gives me an understanding that I previously didn't have, and I thank you for that valuable lesson. I am concerned that these units are not as reliable as I previously found my propane furnaces to be in my other motor-
homes. I am hoping my Aqua Hot will be trouble free for many years with proper maintenance.
Very helpful Darren, thanks.. I had to change both of my pumps out as well. 2016 Entegra Anthem.
Very happy I found this video. I have the same system, a 450D, and the front furnace isn't blowing hot air. Of the two lines exiting the Aquahot, only one is hot. So I thought it was a pump issue and this video confirms it. Now I know how to definitively troubleshoot and fix it. Thank you!
Great video with nice, clear instructions. Had to do my own two pumps (Like those) one year apart with the retro kits.
I'm in the process of getting my first Class A motorhome. I have been studying for over 1 year
on everything dealing with motorhome problems and repairs. Hope fully when I do get my
motorhome I will have learned things that happens and how to trouble shut them. Thanks so
much for sharing the information. I feel like I know a lot more about the Aqua Hot System.
Always educational, instructive, entertaining and amazing.
Excellent Job Darren
I would love a system like that in my RV. We shall see. Thanks Darren informative vlog
Great Info
Another great learning experience thanks Darren
Extremely helpful! Thank you Darren
Thanks for the vid...new aquahot owner here and the vid was helpfull to learn what makes aquahot tick!
Thank you I work on these but have not had to do a pump but now I do .one came in to the job so just want to say thanks for the video.it helped me understand the system.now I will work on it comfortably
Glad our videos were able to help you! If you would like to support us please consider becoming an "RV Community Supporter" on our Patreon site: www.patreon.com/myrvworks
Here is another AquaHot video I uploaded recently: th-cam.com/video/nj_BqehNu64/w-d-xo.html
exceptional video.. Have a 2020 Super C being built and trying to learn all the issues with the different systems. You Video was absolutely exceptional. You know what you are doing. Thank youBrianKaty Texas
Hi THEVROD64
Thanks for the kind comment! I do enjoy working on the Aqua Hot systems - nothing quite like a finely tuned machine to keep everyone comfortable. As I get service calls to work on more of these, I will be capturing the event on video and uploading so others can learn more about their equipment and be Happy Campers!
Cheers,
Darren
Koepp
Excellent video as always. When I'm in your area, I'm definitely going to look you up.
Glad to hear. It would be good to do an annual service, I see a lot of issues with the Aqua Hot because they never got their annual service.
Great video. Thanks! 😀
Very good information
It helps me learn more about my AQUAHOT
Thanks very helpful
Nice video. I think I have a pump out and I have the same model as the one you just fixed.
So this "Aquahot" heats the water and the air in your coach nice, thanks for another educational vid. I'm new to RVing and just started working on my 2007 SeaBreeze from National that went out of business the following year. So far the transfer switch, kwikee steps, generator, and one AC unit are not working, The levelers were not working but started working when I replaced the two deep cell batteries. I don't have an Aquahot it was just interesting to watch your video. I will be wearing out your channel, thanks for the help. I haven't got to look at the frig or the heater yet don't know how they are holding up.
I appreciate this vid. I have a 450D and 1 zone has stopped pumping. I have not trouble shot it yet. Just assume bad pump. My Aqua Hot is 2010 vintage. I access the burner/pump from passenger side and the display board and expansion tank from the driver side LOL
I surely hope this helps you. I do have expectations of more Aqua hot videos coming up in the next few months.
Great Video
Awesome instructional video. Wish you were in Alabama as I'd definitely like to have you service and troubleshoot my Aqua Hot system.
I like your videos. This is great
Nice job
Another great video
Your site and information is so very useful! This is exactly what I needed Darren - thanks so much! Now the RV Sales Company cant find the replacement part - they do see there is a new one to replace this (but didn't know anything about the kit. Aquahot isn't the easiest site to navigate and forget calling on the phone. Do you have the kit numbers? I figured since pump 2 is out I should probably replace both pumps while I am doing this! (thoughts on doing that?
To schedule a service consult with Darren please sign up for the "1:1 Repair Consult" on our Patreon site. www.patreon.com/myrvworks
Excellent video. I'm on the road and have Zone 2 that stopped working. Don't have the tools or equipment to fix it myself, but found a local tech who has worked on Aqua Hot previously. From your video, I can now go through the process with him and hopefully it will be as easy as you make it seem on the video. One question, is it obvious on the mounting plates, which side is the "tail" to know how to orient the plate?
Hi Kenneth,
Thanks for the kind comment. Hope your tech gets if working for you. Regarding the 'tail', it should be obvious, if it is turned inboard there is not enough room for the hoses so outboard really is the only way.
Good luck,
Cheers,
Darren
You are not supposed to use that plate for those pumps. You should drill holes or the wires will get chaffed
Very precise and informative video, I’m feeling confident doing my own now. One question, can I use a manual pump to pump fluid back in or I can’t and burp the Schrader valve properly?
You are supposed to drill holes for the pump or the cover will chaff the wiring on back of the pump. That bracket is for the stir pump which has already been replaced. Also, nice dipping the hose in the antifreeze but put the pump in there as well to make sure it is lubed and not dry.
Thanks for the tip
Great video i had the same square pumps last year and followed your instructions to the "T" replaced them with the retro kit and all was well. fast forward 11 Months .. I don't have heat coming out of the rear coach for pump zone 2... zone 1 pump outlet hose is hot to touch but zone 2 pump outlet is warm and not as hot and the heat exchangers are not putting out hot air .. would i assume that zone 2 pump is out ? All the lights for zone 1 and zone 2 are green .. one indication would be there was an over flow of boiler fluid from the reservior one day which maybe that Zone 2 pump failed and not able to pump out the fluid for that line ?
Boiler valves stuck.
Tap them
Flush and replace boiler fluid .
Great video
Very good, detailed video. My coach is 7 months old and has the old style pumps, but they are working(I checked voltage on both and isolated #1 and can feel/hear it running. Lights are sll green). I am not getting heat in zone 1. Zone 2 works fine. The line from Aquahot to check valve is hot, but between check valve and pump remains cool. From the pump 1 to zone 1 is cool also. Is it possible to have a faulty check valve on a new coach? Or should I be looking elsewhere for the problem? I'd rather DIY than drive it to get service. Cold and snowing here. Thanks!
Really good info I do have a hydro hot system and it's working after some needed maintenance. But my issue is I also have a 110 hot water heater which I can't find to replace the heating element. My question is it actually part of the hydro hot system, I'm thinking it could because it should be in the hot water tank of the hydro hot.
New Subscriber. Best AH video yet. We own a 2015 Tuscany 45AT and had this exact issue. Hot water but no heat in coach from furnace. Getting repaired now. My question is can yo better explain pump 3? We had same issue; 1&2 had red LED lights and 3 was green. What does 3 shut down when 1&2 are running?
Very interesting. So on the inlet side of the pump there is a rubber hose that connects into a metal fitting on the wall. Is that a check valve?
Aqua hot seems to have engineered as if none of the parts will ever break. No valves to isolate the pumps from the system and jury-rigging the door switch seems like they really cheaped out.
There are some check valves in the system and they are obviously larger. Them have a body on them with a nut on the top.
Thanks so so much. Is hydro hot the same I think that's what I have and I want to service it. I need to go look hehe. Thanks alot
Hydro Hot and Aqua Hot are in fact the same. I do have a video coming out very soon that does a complete annual service and walk through on an Aqua Hot so stay tuned for that!
Thank you for the informative video, very well done. My thermostat has three zones and the aqua hot is a 450D.Where is the 3rd pump and what does it service? I can set zone 3 on the thermostat but hear nothing in the coach. Zones 1 and 2 I can hear kick on and feel air from vents. Zone 1 blows hot air and zone 2 blows cold air???
Thanks best videos ever!
Hi Daren love the videos. You are an excellent teacher and presenter. I would like to build the switch box-connector you used on the service and diagnostic video. Can you provide the source for the parts? Thank you
t3interface.square.site/
Darren what color should the glycol side be. Yellow or brown? I just got my 1 st RV and I am working on learning all I can this coach. By the way great videos.
Darren, quick question.. do you remember what year this aqua hot was. I have the exact same system in my Entegra, and was curious when aqua hot made that change away from the faulty motors. Mine is a 2016. Thanks in advance!
This is a 2016 Anthem. Mine. 😬
I have a 400D. Just had pump one (stir pump) replaced, and because both pumps were the obsolete pumps, had the number 2 replaced as preventative maintenance, as well as annual service. My issue is that the #1 pump stays on continuously even when power is removed, thermostat off, switches off.... I thought this could be a faulty basement thermostat issue, as I understand, that controls the stir pump zone 2 for regulating temperature in the plumbing and basement area. I called the Tech that replaced the pumps, and he believes that may be the issue. Meanwhile, I have disconnected the #1 pump to keep it from burning out the pump. I realize your assessment will based on what I have given you.....in your opinion, (which I will/would not hold against you) and is for just your valued opinion. I have heat in zone 1 with burner, and hot water, with just electric, however, I am not sure if the zone 2 will work as advertised for the basement, no heat.
I am an avid follower and view your videos as a reference.....excellent...
Thanks for any input
Ernie
It would be good to know, when that pump is running, is there a green status light on the control board? That is to say does a control board want that pump on? If the control board wants the pump on then you'll need to look at the thermostat input on the JP1 connector that controls that zone. You can manipulate this by connecting and disconnecting the wires to different zones. Keep in mind that the 'stir' pump runs when the Zone is not calling for heat. That is to say there's always a circulation through the heat exchanger, if the zone is calling for heat then the circulation is going through the zones. If the zone is not calling for heat then the circulation is done with his stir pump.
Hey, I’m helping my cousin work on his aqua hot 450D. He’s needing the pumps like you replaced in this video. Been looking for the part numbers but haven’t seen them yet. Can you get me a link for them. Thanks
Those are 10mm nuts not screws, and the mounting boots for the cover there 7/16 1/4 20 stainless steel bolts,I use pinch off pairs to change the pump.
Best place to get replacement pump? Already had the newer ones installed so hoses are already changed out.
Wow, these video is showing me why my 2 front units do not heat
Can you use a power probe to test these pumps?
Thanks for this video. But! My hoses out of the zone pumps are all hot, with only the front zone blowing hot air thru the radiators. Any suggestions on that? I believe I have all the air out of the lines. (I did notice the engine heater pump is bad also). Soon to replace. Tiffin 40' Bus 2015.
So since the 450D presents "so many" lol, problems and uses parts you would not recommend, is there a better heater you can recommend? or is there a better After market product I could switch out the 450D with?
I have a 2016 Thor Tuscany with a 400D and only one of the two zones function. Both pumps are operating and I’ve disconnected zone 1 return line (which does not get hot) and no antifreeze is flowing. I’ve drained the boiler and made sure the check valve was good. Funny thing is that the zone configuration does not match the schematic from Thor. I can’t find any kinks in the lines. How should I blow out the line?
I can fix many things on my old RV, but recently got a 2020 allegro bus, and still trying to figure out how everything works. my 450D aqua hot probably has the pumps burned out now.
my zone 1 ( main area) only blows cold air zone 2 works great hot water works great was told to tap on check valve might be stuck tried it no difference checked pumps ( by feeling water flow/ vibration) both pumps working. zone 2 line hot, zone 1 cold. called a local mobile tech the other day ( it was 21 degrees here in florida) we were in a campground, he came and checked said pumps ok, check valve ok but seems like blockage from return line from heat exchangers charged me $ 300 said it would need to go to factory to fix ....coach is a tiffin 45, red bay al along way to go any ideas?? where are heat exchangers located ? does this seem right ?
thanks
How do you ask a question about your aqua hot 450 de4 not working?
Having the same issue but our coach doesnt have the light panel like you showed. Does air blow from the vents or is it a radiator type?
You could hear my pump working but no fan blowing inside. I did bypass the fans and they are working...what do you think?
To schedule a service consult with Darren please sign up for the "1:1 Repair Consult" on our Patreon site. www.patreon.com/myrvworks
Having same issue with my 400 AH system
Hi Garrett, I live in Bremerton but am currently in San Antonio Texas.
I have a Tiffin Allegro Bus with a 450-DE Aquahot. I had no heat to zone 2 on my heating loop. I thought I had a stuck check valve. I tried releasing it with the hammer trick not still no heat. I decided to drain the boiler fluid and replace the check valve. Lo and behold, the check valve was not stuck. I’m thinking it’s the zone pump. The motor runs fine but it is not pumping the boiler fluid. Is it possible that the integrated pump on the motor has somehow failed? If I need to replace the motor what pump assembly do you recommend?
Thanks
Kurt
We have zone 1 pump not working on our 450D. what are the chances it just needs a new impeller?
So if you dont crimp the heating zone lines it will drain the zones? I want to flush my system amd change all the fluid
Does Aqua Hot offer a class to become certified?
I have the same aqua hot and I’m only getting 5-7 volts at pump one and it’s not running the pump. I switched the wires from pump 2 to 1 to confirm the pump is good. Any ideas what would cause low voltage? My next step is to check the connections of the wires at the circuit board. Thanks!
You can run a jumper wire from the upper right terminal JP3 to that pump directly to find out if it's coming from the control board or if it's the wiring.
450D….how much boiler fluid is in the system? Thanks for what you do!
It's right around 6 gallons, but check with your manual.
@@MyRVWorks Thanks much!
Darren, my problem is opposite, any ideas ,,,, only on electric.
Wow. Are you related to MacGyver? Just sub'd. Excellent work.
"We're gonna make red positive and black negative..."
You made it sound like it was an arbitrary choice. 😆
Darren, when watching the video I noticed that the antifreeze looked like automotive antifreeze. My understanding is you should use a non-toxic, I forgot the kind of antifreeze it is, but because the domestic hot water runs through the boiler, cross contamination could happen. If this is not the correct, please advise, Thanks, Enjoy all your videos and have learn a lot.
Boiler antifreeze is what is to be used in these systems. It does come in two colors that I'm aware of, reddish-pink, and like a fluorescent orange. I never mix the two but I have worked on the systems with each. When I went through Aqua Hot factory certification training they demonstrated both types.
It is the same color but it is called Centry fluid. And is non-toxic.
Probably cut your time in half every job like this