Shower pump activates when hot taps are turned off

[Brooksie1963]

Help!
A customer of mine has the following problem:
The shower pump in the loft comes on, just for an instant, when any of the hot taps in the house are turned off.
It's a vented hot water tank system using a Warwick flange and now with a check valve / non return valve just after the hot distribution pipe out of the flange. This was supposed to solve the problem and it didn't.
Any ideas please?
Martin

 

[Mark raig]

What make of shower pump was it mate

 

[ocentric]

I had a customer last year with a similar problem. I traced the pipework back and found a 4" piece of pipe (dead end) coming from a tee (all plastic, plumbed by a builder). I removed this and the problem went. I imagine the water was bouncing back when the taps were closed, just enough to get the float switch on the pump going.

 

[buff]

Help!
A customer of mine has the following problem:
The shower pump in the loft comes on, just for an instant, when any of the hot taps in the house are turned off.
It's a vented hot water tank system using a Warwick flange and now with a check valve / non return valve just after the hot distribution pipe out of the flange. This was supposed to solve the problem and it didn't.
Any ideas please?
Martin

im sure your not suppose to have anything in between the tank and the pump,this may be causing some kick back
bob

 

[buff]

im sure your not suppose to have anything in between the tank and the pump,this may be causing some kick back
bob

sorry miss read the qoute,is there anything in between the tank and pump
bob