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One more thing we did notice also was when asking for either a DHW or CH flow temp range on both it was giving us 10 degrees more than demand.. e.g set potentiometer to 55 degrees for DHW and it would deliver 65 degrees but then cycle correctly and hold it at that once we had changed the plate...

Yes.. still cut out just the same as when still on rads/system

Yes sorry .. filter clear, one of the first things we went to because DHW was good .

Hi.. Heating Engineer here, ready to give up !! We have been looking into an over heat issue with a Potterton Titanium Combi 40kw, Customer thinks about 5 years old. They have had 3 engineers out previously, all walked away. Boiler was firing on both CH and DHW and then cutting out after...