Warm radiators when hot water on!

[rosso warrior]

The radiators get warm when the hot water is switched on.

Any one have any ideas what the problem is?

I was wondering if it is the 3 way motorised valve

-- rosso warrior

[rosso warrior]

OK checked valve wiring and all seems fine.

Its opening the valve (vertical) when hot water is turned on an horizontal when the heating is turned on, is this correct?

The water comes in from the pump into the `t` with the top pipe goin into the hot water tank and the bottom pipe going to the radiators.

But obviously both ends are getting hot when the hot water is turned o hence the radiators getting warm

-- rosso warrior

[Set Square]

Is this a new problem, or has it always done it? If the latter, the return pipework could be connected incorrectly, permitting reverse circulation round part of the heating circuit.