Grundfos power shower pump

[johnianlairdmorrison]

Hi Guy's

I've got a Grundfos pump (type STP-3.0 B) which was installed to support our shower. Just recently it's started to come on when I run the hot tap in the bathroom, then when the tap is turned off it keeps running and will continue to switch on and off for a while, most of the time, the only way to stop it is to switch it off, wait a few seconds then switch it back on again. When I have a shower, it seems to work as normal switching on and of on demand. Any advice on how to fix it would be very welcome

Many Thanks

John Morrison

 

[jeds]

Sounds like a sticky flow switch. Not sure it would be repairable? If I were you I would speak to or email Grundfoss tech support.

 

[Abyone]

I had this issue and Grundfos told me to install non return valves on pump outlet.