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I have posted before but the problem seems to have spread itself onto the Central Heating too. When any hot water has been ran through heating or DHW the boiler wants to wait until it cools completly (20 degrees) down before it wants to fire up and tonight was the final straw........I had to...

I have checked the sensor in this case is on the diverter valve and the system was cold. The reading shows 12 k and the sensor on this boiler is combined with DHW and CH by a 3 port valve. Had the system flushed a few months ago, together with a full service kit fitted for the diverter valve.

Bloomin Vokera Im at a loss to this one and can't get is sorted. My boiler rests over night and central heating is fine. Turn the hot water on and the boiler fires up, water gets hot. Great, so you think. Problem is that, if i need to draw hot water off again within minutes, i have to wait...