Fully pumped system

[jumpin']

3 bar pump supplying the house, hot fine, cold sporadic. The cold supply is fine but at the taps it's poor. Stripped the pump down (Stuart Turner) found nothing wrong. It seems to build pressure then loses it within seconds.Anyone any clues or come across this? ta

 

[bob the plumber]

yeah ive come across it, i left the isolator partially closed on the inlet to the pump 🙂 and wondered why i had the same problem as you, i hadnt spotted it as when i turned the shower on it seemed to work fine but at a lower tempreture it came to a trickle as there was no cold mix. i had to drive 15 miles the next day just to turn the isolator fully on. silly mistake that wont happen again.

If its not that why dont you disconnect the pump cold oulet and link it up to some plastic into a bucket and see if you still have the problem, if you do its safe to assume that either you have a problem on the cold feed to pump or with the pump itself 🙂

i know this is basic stuff but worth a try.

 

[IDCHAPPY]

So the flow switch and everything else looked ok when you stripped it down? doesn the pump run when you open the tap and keep running till it's closed or just cut out?
I heard from a pump supplier the ST pumps canb be abit twitchy and dont like getting the power cut off and on to them as it can do the pcb in.

 

[jumpin']

Cheers everyone, had a sleep on it & went back in the morning. Always the best thing. It was the float switch, which has 3 'legs' and these had become narrowed, so when it kicked in, it partially blocked the flow. Sorted in 15 mins