Stuart Turner showermate twin pump problem

[Qster]

Hello, I fitted the above pump for a customer and lately it is intermittently not kicking in. The feeds are 22mm to the flexi connectors. The cold is a separate feed but the hot is the main feed that also feeds the sink in the same bathroom as the shower and the kitchen tap directly downstairs from the bathroom. Only a small house. It said you can do this and has been working on. Any recommendations on why it is now sometimes not working?
Many thanks

 

[Johntheo5]

These are positive head pumps and require a flowrate of 1.0LPM or more from either a cold or hot tap to make either flow switch to start the pump. Is this only happening when HW only required?. A likely suspect might be a thermostatic shower which when first switched on only takes HW ininitially, maybe worth holding a container for exactly 30 secs under the shower head with it in its customery position and measure this with a one Litre container, X 2 for the flowrate in LPM.

 

[Qster]

Hi, I think it’s when they use the kitchen tap it doesn’t always kick in so the pressure is obviously restricted through the pump that’s not pumping.

 

[Johntheo5]

If I'm reading you correctly, then suggest, with that kitchen tap opened, switch on the shower, if it doesn't start, measure as above from the shower to confirm that the flowrate is < 1.0LPM.

 

[Qster]

Thank you, will do. If I remember right I did do a volume test and it was sufficient but will check again