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First shopw The 28cdi is a combi and does not have a tank or motorised valve but thanks for the reply. .. Fitted a new diverter valve ( £78 in Vat ) Everything now back to normal.. .. When I look back it was staring me in the face .. When the heating kicked in - the sticky ( then stuck )...

Will do.. Unless you get there first ! I am going to strip the diverter valve tomorrow.. Will update with results..

Thanks for the reply.. Colder below .. Is there anyway of moving the valve manually ? Is it a common spindle that activates the DHW switch ?

It's not the pump.. Changed that with no change Flushed system - no blockages Now the nearest Rad won't even get warm despite the pump running for ages Flow & Return do get warm - but I think this in conduction from the boiler.. Could the diverted valve be stuck ? DHW is fine (very...

Stop press.. Isolated half the rads nearest the boiler.. The rest started to warm up.. Looks like a flow problem.. - I guess pump has got a bit lazy.. Thought ?. £157 from plumb centre - err no Any cheaper sites ?

Thanks for the reply.. Makes sense.. The pump feels very hot.. The towel rails in the bathroom /shower room ( direct off the flow & return ) nearest the boiler get red hot. All others ( that are fed from a 10mm manifold ) just get Luke warm. Blockage in manifold ? I just did a system flush...

Hi I have a 28CDI DHW works fine CH demand comes on and boulder will work for a few min The the flame is shut off - CH light remains on, pump still running. After a while fires up again for a couple of min - repeat... Repeat .. Only heating the nearest rads. Flow out of boulder hot...