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01-07-2025, 10:12 AM
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#1
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Junior Member
Tiffin Owners Club
Join Date: Apr 2024
Location: Oxford, MS
Posts: 10
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Aqua-Hot "Fault"
I am getting a "Fault" indication on the inside Spyder control for the Aqua-Hot. There are not fault indications on the Aqua-Hot panel. I serviced the unit with a new filter and nozzle. System starts up and runs great for several hours, sometimes for a day. Then when I check on the MH, the aqua-hot has cooled, the pumps are running and the inside control shows a "Fault" indication. This is my first experience with a Aqua-Hot system. Any suggestions as to the problem would be much appreciated?
2017 Allegro Bus 37AP
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01-07-2025, 10:45 AM
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#2
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Senior Member
Tiffin Owners Club
Join Date: Jun 2017
Location: Odessa, FL
Posts: 1,088
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12V shutoff
Try rebooting the Spyder panel.
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2023 Tiffin Allegro Bus 45OPP
2019 Birkshire 34QS - Traded
2020 Jeep Cherokee Trailhawk with BlueOx/AF1
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01-07-2025, 11:35 AM
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#3
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Member
Join Date: Oct 2022
Posts: 76
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On our display, there's a horizontal bar that, I think, says "AquaHot". If pressed will display the fault and allow you to get to a button where you press for 5 seconds to reset it.
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Jim, Kerry and Tilley (English Springer Spaniel)
2022 Tiffin Phaeton 36SH
2022 Ford Ranger Tremor
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01-09-2025, 10:32 AM
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#4
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Junior Member
Tiffin Owners Club
Join Date: Apr 2024
Location: Oxford, MS
Posts: 10
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Problem continues
We put another nozzle in and made sure everything was set correctly. The set screw on the igniters was loose so we adjusted them and tightened everything. Reset the Sypder control. Aqua-Hot started fine but it did have some delay relighting on cycle 2 and 3. There was white smoke with raw fuel for a bit before it lit. The next many cycles started perfect. It was in the 20's in my shop. Went out this morning and it was in 'Fault' mode again. The Spyder control on the 2017 bus does not have the robust display and I do not know how to get a fault code. I am going to call Tiffin.
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01-09-2025, 10:46 AM
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#5
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Apr 2012
Location: Southern NM
Posts: 3,786
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If you’re trying to keep things from freezing in your coach, leave the AquaHot on electric if you’re having trouble with the diesel side.Our Mh garage is not heated nor insulated at this time. When it gets into the low 20s or lower I leave the furnace on electric, thermostat set to lowest setting. Coach closed up, all shades down. It will stay at 49 degrees
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2018 Allegro Bus 37AP
2014 Phaeton 40 QBH (sold)
2022 Jeep JLURD
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01-10-2025, 04:47 AM
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#6
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Senior Member
Join Date: Sep 2011
Posts: 567
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Not making a whole ton of sense. Sequence should be, thermostat calls for heat. Check if unit is at operating temp, if not, blower motor comes on, then burner. Sensor makes sure the flame is actually lit. Once at operating temperature, next it checks the cold water bypass temp to make sure someone isn't taking a shower or something. If so, the stir pump comes on and the heater does not. Otherwise, the heating system pumps go on, valves pop open (God willing, although if it's been sitting a couple of years without running, they probably won't), and the register fans come on. If the unit is cold, that thing isn't even to second base, the register fans got no business running (if it's just that the registers are blowing cold air, check those valves)
Even on the older units like mine, troubleshooting isn't terribly difficult. I agree with ya so far, starting point is to make sure annual service is current and correct (taking it apart is always the easy part, ain't it?) Next step for me is to get down there with the control panel, make sure the connections are tight (which is usually it, those things can jiggle loose), check my coolant level. On some units you gotta make sure the cover is on nice and tight. See what your LED lights are trying to tell ya. Look, listen, feel and smell. If the answer doesn't jump out at ya, on my unit you have to make a jumper cable and isolate the problem at the control board.
It follows, at some point you gotta download the service manual for your unit. Believe me, this is not the last time you're gonna have words with this thing, among other things, you'll find it only ever wants to act up at 2am when it's freezing cold outside. "Honey, I'm cold!" Cat giving you the look that kills, you know the drill. Times like that, you gotta understand how the thing thinks.
"If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat"
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2021 DRV Santa Fe 44
2024 Chevy 3500 dually
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01-11-2025, 09:25 AM
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#7
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Member
Tiffin Owners Club
Join Date: May 2016
Location: Green Cove Springs, FL
Posts: 71
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I’ve had ongoing issues with our AH450D going into fault after running flawlessly for a day or two. Full maintenance of the unit didn’t resolve the issue. Ours turned out to be air in the system that took 4 or 5 cycles of adding transfer fluid so the overflow reservoir was full, then running the pumps until the unit came up to temp and the fluid in the reservoir dropped to low until the fluid level was maintained at full or just below full level. Ours would overheat typically when it went into fault so it may be totally unrelated to your fault issue just thought I’d share our frustration and then resolution as something to check.
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2022 Tiffin Allegro Bus 45OPP
2021 Jeep Wrangler Unlimited Sahara
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01-12-2025, 08:10 AM
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#8
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Junior Member
Tiffin Owners Club
Join Date: Apr 2024
Location: Oxford, MS
Posts: 10
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Thanks for the info. When I served the unit, I accidentally left the cap off and lost some fluid. When I started it back, I noticed some air in the line. I will double check it before I install the $1,100 new control!
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01-14-2025, 06:31 PM
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#9
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Member
Tiffin Owners Club
Join Date: Jul 2011
Location: Alabama
Posts: 49
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We had the same problem last year and it drove us crazy. The fact that you said that the igniter nut was loose but you tightened it makes me think it was the same situation as we had. Your igniter is not aimed exactly as it should be. Tiffin realigned ours and we have not had a problem since. Our symptoms were the same as yours.
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01-14-2025, 08:24 PM
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#10
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Senior Member
Join Date: Nov 2011
Location: Polk City Florida
Posts: 1,942
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Fault
Check the coil on top of the burner, mine just failed with same circumstances you report. Coil swapped out and fires perfectly. Coil $560 vs $1,100
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Don and Nancy
[2018 Tiffin Bus 40 AP, 2021 Jeep Grand Cherokee , Sara our family pup, Electric Catrike
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01-20-2025, 05:27 AM
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#11
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Member
Tiffin Owners Club
Join Date: May 2016
Location: Green Cove Springs, FL
Posts: 71
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Curious if you were able to resolve your issue?
__________________
2022 Tiffin Allegro Bus 45OPP
2021 Jeep Wrangler Unlimited Sahara
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01-21-2025, 06:26 AM
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#12
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Junior Member
Tiffin Owners Club
Join Date: Apr 2024
Location: Oxford, MS
Posts: 10
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I got in touch with a certified service tech the can get the control module hundreds of dollars cheaper that I can. Once this cold weather get through, I’m going to run over to Ted Bay and let her fix it.
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