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Old 09-23-2014, 12:19 PM   #1
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Water Pump Won't Shut Off

What are we missing here? We've turned all the faucets on (kitchen, bathroom, shower, outdoor shower) then turned the pump on, ran the water for a few minutes, turned all faucets off and the pump still keeps running. We can turn it off manually, but wonder why the auto shut off doesn't work. Don't see any leaks (this is a new 2014 400BH). I feel like we are missing something simple. Thoughts?
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Old 09-23-2014, 12:32 PM   #2
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Is it still filling the hot water tank? If so, it could run for a little while before it's up to enough pressure to shut off.
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Old 09-23-2014, 12:37 PM   #3
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We've let it run a while and it doesn't shut off. We have a tankless water heater.
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Old 09-23-2014, 12:39 PM   #4
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Well, in that case, if it's not still filling, and it's not leaking from somewhere then the only thing left is a possibly bad pump. Since it's a new unit, I'd just bring it back to the dealer and let them deal with it under warranty.
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Old 09-23-2014, 12:46 PM   #5
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Eliminate outside (city water connection) leak and outside shower wand open as possible pressure loss source.

When you open the faucets; do you have pressure inside?

Yes; Pressure detection switch stuck closed or bad internal check valve allowing pressure to return water to tank.
Call for warranty replacement.

No; Failure to prime:

Low water level in fresh tank - Causes: Not enough water in tank and pump inlet sucking air. (see photo)

Loose connection on inlet side of pump allowing air to intrude causing failure to prime.
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Old 09-23-2014, 12:50 PM   #6
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Quote:
Originally Posted by Herk7769 View Post
Eliminate outside (city water connection) leak and outside shower wand open as possible pressure loss source.

When you open the faucets; do you have pressure inside?

Yes; Pressure detection switch stuck closed or bad internal check valve allowing pressure to return water to tank.
Call for warranty replacement.

No; Failure to prime:

Low water level in fresh tank - Causes: Not enough water in tank and pump inlet sucking air. (see photo)

Loose connection on inlet side of pump allowing air to intrude causing failure to prime.
We've turned the outside shower off, we have pressure in the faucets, the water tank is more than half full. I'm thinking the pump went bad. We're heading back to the dealer in November so this might just go on the list.
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Old 09-23-2014, 01:00 PM   #7
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Trash in water line sucked into the pump can cause the check valve to stay open and results in short cycling or continuous running.

Try opening all the faucets (to create a large demand) then turn on the pump. Let it run a bit then turn off the pump.

Close the faucets and re-power the pump.
Maybe it will clear.
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Old 09-23-2014, 01:16 PM   #8
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Make sure the cap on the fresh water tank is closed and sealed correctly. There have been a few times I have filled the fresh tank and failed to put the cap on (brain fart) It wont pressurize unless ti is a closed system.
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Old 09-23-2014, 01:58 PM   #9
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Make sure the cap on the fresh water tank is closed and sealed correctly. There have been a few times I have filled the fresh tank and failed to put the cap on (brain fart) It wont pressurize unless ti is a closed system.
FYI - the fresh water tank needs to be vented to avoid collapsing the tank.
There is a vent right next to the fill port.

The cap just keeps junk out of the tank.
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Old 09-23-2014, 02:46 PM   #10
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Quote:
Originally Posted by Davidceder View Post
Make sure the cap on the fresh water tank is closed and sealed correctly. There have been a few times I have filled the fresh tank and failed to put the cap on (brain fart) It wont pressurize unless ti is a closed system.
I'm trying to figure out how this would matter, isn't there a vent next to the fill cap anyway?
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