I have a 2-bar pumped shower (Water Mill pump) fed from a large cold water tank in the loft and the hot water cylinder in an upstairs room. The pump is located at the base of the hot water cylinder. Pipework is plastic 22mm routed up and over to a thermostatic shower mixer (with 22mm inlets and non return valves) on the same floor as the pump.
My problem is that the pump will not run continuously without stuttering every 5 or 10 seconds. The pump stops and then instantly starts again. The only way to guarantee an uninterrupted water flow is to force either the hot or cold side pump reed switch ON with an external magnet and manually switch the power to the pump. The shower was installed around 8 years ago. This problem has been present for at least 2 or 3 years.
I have checked the pump impellers (brass) and its filters. I have fitted an automatic air bleed valve in the hot side at its highest point (this stopped the pump pulsing when turning the water off). I have recently had the shower mixer cartridge replaced . This was very furred up due to hard water.
I am now wondering the problem could be something to do with the non-return valves in the mixer elbows. They are under the tiles and so have never been inspected. However if it is these I have no idea how they could be causing the problem.
Has anyone any idea what could be wrong?
My problem is that the pump will not run continuously without stuttering every 5 or 10 seconds. The pump stops and then instantly starts again. The only way to guarantee an uninterrupted water flow is to force either the hot or cold side pump reed switch ON with an external magnet and manually switch the power to the pump. The shower was installed around 8 years ago. This problem has been present for at least 2 or 3 years.
I have checked the pump impellers (brass) and its filters. I have fitted an automatic air bleed valve in the hot side at its highest point (this stopped the pump pulsing when turning the water off). I have recently had the shower mixer cartridge replaced . This was very furred up due to hard water.
I am now wondering the problem could be something to do with the non-return valves in the mixer elbows. They are under the tiles and so have never been inspected. However if it is these I have no idea how they could be causing the problem.
Has anyone any idea what could be wrong?