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The HW thermistor - but in the beginning both the CH and the HW were shutting down after a few minutes running - this got progressivly worse From what I can see of the diagrams the Plate heat exchanger is only used for the HW - so it must be something common to bothe circuits thats why I...

Thought Halstead were good - one of the most reliable overall? pete :?:

Halstead Ace High boiler After installation sytem cleaner and inhibiter put in and last year all rads taken off and individually cleaner with washing up liquid and pwer washer with rubber mallet! Have a problem - just cant find out a solution tried everything - seen it on this forum a few...