Ecotec 831 boiler heating rads when hot water is on.

20 Aug 2007
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United Kingdom
As the itle says, my 3 year old Ecotec 831 boiler is heating the radiators when I turn on the hot water. I never noticed this in winter, but now the CH is off, the Rad's still get hot whenever I have a shower or use the hot water for a while.

Has anyone seen this problem before?

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Never seen this on a Ecotec as yet, but sounds like the DV needs checking ;)
I have now replaced the deverter valve which was very stiff and had been leaking a small ammount into where the actuator is.

The new DV motor does not move. It seems to stay in the mid position and I have exactly the same fault. Do I now need to look at replacing the PCB?


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