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Wongkitlo

Automatically water pump not turning off

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I have just installed a 2000 litre tank and an automatic Hitachi pump. It is hard to work out how my Thai wife and the worker describe the problem but they say it turns on but does not turn off. We are manually turning it on for showers and then turning it off after. I wondered if anyone had any idea about this problem. Cheers.

 

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Not sure what pump you have as you didn't mention the model or type, but most of them have a pressure switch that prevents the pump from over pressurizing the system. It usually starts the pump at a preset low pressure then cuts off at a preset higher pressure. Sounds like to me the pump isn't reaching it's cut off pressure. Could be an airlock in the pump--the pump needs to be bled totally of air; or it's running and won't shut off because you're switching it off before it reaches the cut off pressure--you didn't say how long it's running. I would start with making sure ALL air is out of the system, then if there's a gauge in the system, watching that to see of the pressure climbs. I've had pumps before that had air in them but built up some pressure so it seems like it's working, but it never got high enough to cut off. Good luck.

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Posted (edited)

The persons installing should take care of the matter.  If they are just general contractors they need the advice of a pump installer/repair person.  As said the pumps have a cut on/off pressure settings (which are often fixed) - are you perhaps also using town water supply?  If no check valve/turn off valve on that line pressure will never get high enough to shut off pump as the pressurized water is just going back into the supply water system.

Edited by lopburi3

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34 minutes ago, Wongkitlo said:

have just installed a 2000 litre tank and an automatic Hitachi pump. It is hard to work out how my Thai wife and the worker describe the problem but they say it turns on but does not turn off. We are manually turning it on for showers and then turning it off after. I wondered if anyone had any idea about this problem. Cheers.

Lack of an NVR on the bypass feed.

 

you really need to diagram your supply and feed to the house to get a reasonable diagnosis. Mine is a good guess if you have a bypass but useless if you don't.

 

at the moment it's similar to my car won't turn off. 😉 not nearly enough info.

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Lack of an NVR on the bypass feed.
 
you really need to diagram your supply and feed to the house to get a reasonable diagnosis. Mine is a good guess if you have a bypass but useless if you don't.
 
at the moment it's similar to my car won't turn off. [emoji6] not nearly enough info.
Hey thanks. Is good info but don't know what an NVR is?

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The persons installing should take care of the matter.  If they are just general contractors they need the advice of a pump installer/repair person.  As said the pumps have a cut on/off pressure settings (which are often fixed) - are you perhaps also using town water supply?  If no check valve/turn off valve on that line pressure will never get high enough to shut off pump as the pressurized water is just going back into the supply water system.


Thanks. Am a long way from anywhere and have the local fix anything guy coming back tomorrow. The mains water goes to a tank and then to the pump.

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Not sure what pump you have as you didn't mention the model or type, but most of them have a pressure switch that prevents the pump from over pressurizing the system. It usually starts the pump at a preset low pressure then cuts off at a preset higher pressure. Sounds like to me the pump isn't reaching it's cut off pressure. Could be an airlock in the pump--the pump needs to be bled totally of air; or it's running and won't shut off because you're switching it off before it reaches the cut off pressure--you didn't say how long it's running. I would start with making sure ALL air is out of the system, then if there's a gauge in the system, watching that to see of the pressure climbs. I've had pumps before that had air in them but built up some pressure so it seems like it's working, but it never got high enough to cut off. Good luck.


Thanks. An airlock makes sense . Do you bleed it by just letting it run with the furthest outlet open?Is a semi large guesthouse.

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You could have a serious leak.

 

As above , if the tank has a bypass from the incoming mains but no Non-Return Valve, you could also be pumping water back down the mains when the pump is running.

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Your pump setup should be something like this (probably with rather fewer stop valves)

 

pump setup 2.jpg

The NRV of which @sometimewoodworker speaks is the bottom one in the diagram. This allows city water pressure through when there's no power so you at least get some water.

 

Note that this valve is sometimes a simple stop valve, this must be OFF for normal operation. In fact if you have this valve and it is ON then you would get something like the symptoms you are seeing.

 

Post a few pictures of the arrangement you have.

 

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Looks like the one open tap (centre of the 3rd picture) is the bypass that allows city pressure into the house (for if you have no power).

 

Close this one and open the other three.

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Right.  Just to add a few comments:

 

Guessing the pipe on the left is incoming main and the one on the right is out to your house.  If so, the valve on the far left (controlling feed to tank?) and the valve on the tank out should normally be open.  The valve in the middle closed with the one on the right open will supply water from the tank/pump.  The middle open and the right closed will supply water from the main (pump wont engage).

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Right.  Just to add a few comments:
 
Guessing the pipe on the left is incoming main and the one on the right is out to your house.  If so, the valve on the far left (controlling feed to tank?) and the valve on the tank out should normally be open.  The valve in the middle closed with the one on the right open will supply water from the tank/pump.  The middle open and the right closed will supply water from the main (pump wont engage).
Hey sorry. Just woke up when took the photo. Ee bypassed overnight to have some water

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Looks like the one open tap (centre of the 3rd picture) is the bypass that allows city pressure into the house (for if you have no power).
 
Close this one and open the other three.
Sorry just woke up when took the photo. Bypassed overnight

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