Central heating problem

12 Jan 2009
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United Kingdom
Woke up this morning to a clunking noise (heating was on) . went to have a wee look and it seems to be coming from my 2 port motorised valve there is 2 one above the other noise is coming from the bottom one which has a black bit of plastic ontop like a button and on the side wee lever says a-b the button on the top seems to move and come out and makes a clunking noise then goes down and does it again its a fair noise coming from this and never happened before.
No problem with hot water, just when heating comes on the problem accours

ACL LIFESTYLE 2 port motorised valve 679h308 30 li 22mm

Any ideas thanks Ally!!
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Take the head off and check the spindle is free to move.

If it is, replace the valve head. If it isn't replace the complete valve.

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