Heatslave 20/25 switching on

[rhiridflaidd]

When I turn the cold water taps off.

I think I know why - the supply to the boiler is a long way off the main water supply inlet, so the pressure into the boiler drops when I open a cold water tap.

When I close the cold water tap, the pressure in the system increases, making the boiler think there's demmand from the hot water supply, and the boiler fires up needlessly.

Is my theory correct, and if it is, what can I do about it?

 

[holty]

is it a mixer tap your turning on?

 

[rhiridflaidd]

No, any cold water tap in the house.

 

[SvenVanLagerTop]

Have you checked for any " dead legs " on the pipe carcass? This can cause what you describe.

 

[rhiridflaidd]

Is a dead leg a length of pipe that leads nowhere - I think I have one of those.

Just read up on dead legs. I'm distinctly unhappy.

 

[SvenVanLagerTop]

Yes. You need to put some form of bleed or drain cock to get rid of any trapped air from the end of the pipe.