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Old 03-14-2018, 07:58 AM   #1
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AH - Stir Pump?

Hi all,
Can anyone share what the symptoms of the stir pump going out would be? In the past when the AH was left on (400d - electric or diesel or both) we'd feel the warm spot under the tile in the rear bath between the sink and shower. We no longer feel that spot but do have hot water at all taps when on electric though it takes a bit for the hot water to get to the taps. When on diesel the burner is running however we don't seem to be getting any heating from it for water or vents. Everything runs like it should be putting out heat/hot water but it simply isn't hot air/water. If we turn the electric side off, and call for heat/hot water it will fire and run like it is supposed to but again no heat/hot water is produced. In looking through the TSing manuals I'm starting to think it might be the stir pump? Anyone have a stir pump go out and if so what were the symptoms? Or anyone have something similar in the past?

Thank you,
Joey
'17 Aspire 44B
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Old 03-14-2018, 08:21 AM   #2
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I had my stir pump go out. The purpose of the pump is to circulat the boiler fluid within the boiler tank so that the fluid contacting the coils in the tank is moving to keep fresh hot fluid in contact with the coils. The symptom is when you call for hot water at the tap or shower, it is hot at first and then gradually gets cold. Even if the burner comes on, a continuous flow of water will remain cold.

A work around to have hotter shower water for me was to raise the thermostat setting for one of the heating zones which circulated boiler fluid through that zone and in turn circulated the boiler fluid in the tank. This in effect stirred the fluid in the tank.

A call to CS will help you diagnose the problem.

Good luck.
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Old 03-14-2018, 08:30 AM   #3
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Thank you, that describes my shower last night to a "t" but at the time I assumed it was just the electric not keeping up as both switches were on. Will do some testing and give CS a call. Thanks again!
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Old 03-14-2018, 08:37 AM   #4
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Take a look at the service panel, I think I had a stir pump light on.
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Old 03-14-2018, 08:39 AM   #5
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If you have the Aquahot 400D you do not have a separate stir pump. Your boiler circulation is done by pump #2. When you have the hot water running the aquahot will shut off the circulation pumps to conserve the heat for heating the water. Thus no hot air coming from your registers
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Old 03-14-2018, 02:31 PM   #6
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The AquaHot panel is mounted vertically behind the AquaHot and if you have a failed pump, you should have a red light on showing that the pump is bad. Check the panel.

Now, also call AquaHot customer service. They are pretty good and have been very helpful several times I needed their help. Call their 800 number and they should be able to quickly focus in on the problem. JMHO.

Gary
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Old 03-14-2018, 03:30 PM   #7
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Joey, as mentioned your 400D is a little different than the 450D in the Anthem and Cornerstone. I would second the suggestion to call customer service, have them log the issue and try to help you. Itís likely they will refer you to Aquahot, but itís important to generate a history of defects with Entegra if youíre still under warranty.

-Matt
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Old 03-15-2018, 06:37 AM   #8
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Just an update, pulling the fuse under the driver's seat appears to have corrected things at least for now. With the electric switch off the diesel side is providing both hot water and air to all zones, cycling on an off as needed etc. Still not sure what happened but at least things appear to be back to normal with minimal unpleasantries.

Thanks again for the replies,
Joey
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Old 03-15-2018, 06:55 AM   #9
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Joey, Iím glad that youíre back in good shape.

Can you please elaborate on what fuse you pulled? Was it located in the small exterior compartment below the driverís seat?

Did it remove power from the AH entirely?

Thanks again for the follow up.

-Matt
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Old 03-15-2018, 08:18 AM   #10
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Hi Matt, it is in the small exterior compartment in front of the driver's steer tire. Fuse 16 in the bottom of the 2 small fuse blocks on the right hand side. I think it was a 25A fuse and it does remove all power to the AH. Hope this helps!

Thank you,
Joey
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Old 03-15-2018, 10:49 AM   #11
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Joey

Well thatís a new one. After 4 years of lurking and active participating on this forum, that is a solution I have never heard about before.. thanks for plowing new ground on fixes.

Gary
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Old 03-15-2018, 07:24 PM   #12
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Quote:
Originally Posted by Holmrun View Post
Hi Matt, it is in the small exterior compartment in front of the driver's steer tire. Fuse 16 in the bottom of the 2 small fuse blocks on the right hand side. I think it was a 25A fuse and it does remove all power to the AH. Hope this helps!

Thank you,
Joey
Glad you got it heating again. Used the same method on mine once to reset the unit. Just to add a note, the fuse only removes 12 D.C. volt power. Which runs the control board and pumps. If your are working on the unit don't forget to turn off the 120 AC breaker inside the coach.
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