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 Post subject: Power shower problems
PostPosted: Sat Nov 04, 2017 7:45 pm 
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Advise would be appreciated by a DIYer regarding the problem I'm experiencing with my shower system which consists of a thermostatic twin head mixer valve and a remote Grundfos Niagara STC-1.5C twin impeller pump.
Basically the shower will not always turn on and at times the flow from both hot or cold (not together) reduces so changing the temperature.
When turning on (the majority of times) no flow is achieved and only by continually turning the on/off  knob between its limits or the temperature knob between maximum cold or hot will the shower start. Once a start is obtained everything is usually OK but from time to time the cold or hot supply reduces and so affects the temperature.
This suggests to me that either the shower valve internals or the pump flow switches are sticking.
I have checked the filters are clean and that the flow with pump on or off and with shower hose loose and hanging is OK.
The shower system originally worked fine every time with the problem only developing over time.
Should I change the pump or is there another approach ?


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PostPosted: Sun Nov 05, 2017 12:07 pm 
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The shower may also have non-return valves fitted, either internally or in the pipework. These can stick, particularly if you are in a hard water area. More likely to be sticky if shower has not been used for a while. Worth checking before spending more money. However, if they are present, and one or more is stuck, you wouldn't get a decent flow without the pump on.



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