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shower pump pulsing

Joined
13 Feb 2005
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United Kingdom
Have installed a thermostatic shower with a twin impellor pump. The pump has an independent cold feed from storage tank in loft, and hot feed from hot water storage cylinder (both 22mm). When I run the shower on cold, or set to quite hot, the pump works fine, as soon as I turn it to a tepid/warm setting the pump pulses. Asked manufacturer for advice, they suggested raising the reed swithes, have done this to no effect. Any suggestions?
 
Tried that already, they were not at all helpful, told me to get a plumber
 

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