Central Heating/Hot water Pump won't turn off

Jason58 · 3 Jun 2008

We have recently had the pump changed seems to work fine. Have a Potterton EP3001 switch which looks like it is working ok, timer correctly set, but the pump will not turn off when heating the hot water, even when we push the off button, the hot water light goes off so you would expect the pump to stop but it doesn't. We are having to turn it off at the mains in order to stop the water getting too hot.

Any advise would be much appreciated.

seco services · 3 Jun 2008

has this been doing it since the pump was changed ?
did he touch any wiring or just change the pump?

Jason58 · 3 Jun 2008

Yes since the pump was fitted but didn't touch the wiring.

seco services · 3 Jun 2008

does the boiler still fire up or not ?

Jason58 · 3 Jun 2008

Yes boiler fires up - pipes to the pump getting hot when off, the water tank is not getting hot and no lights on.

seco services · 3 Jun 2008

after your pump should be a valve is it a 2 port or a 3 port ?

Jason58 · 3 Jun 2008

If you mean the little button to adjust the flow actually on the pump it is 3

seco services · 3 Jun 2008

no after the pump have you one of these

http://www.toolstation.com/images/library/stock/webbig/60151.jpg

or

http://www.toolstation.com/images/library/stock/webbig/85125.jpg

Jason58 · 3 Jun 2008

yes we have one of those.

seco services · 3 Jun 2008

Jason58 said:
yes we have one of those.

are you being serious i know you have one but what one they are both different.
ones a 2 port ones a 3 port

Jason58 · 3 Jun 2008

Sorry we have two Valve Actuators code: BGMVSP2 (gas code 555212) both with two pipes going into them.

seco services · 3 Jun 2008

so turn all your heating and hot water off at programmer.
on the valve feeding the cylinder is a little black lever on the end push that across is it stiff or loose ?

also the pipe from pump to valve is hot ?
but pipe on otherside of valve is cold ?

Jason58 · 3 Jun 2008

very stiff can't really move it.

seco services · 3 Jun 2008

sounds like it jammed.

on the side of the valve casing is another black lever push that in and the plastic top will lift off the brass valve.

is the plastic casing hot ?

Jason58 · 3 Jun 2008

No casing isn't hot.

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Central Heating/Hot water Pump won't turn off

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