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Yes I agree but why would you need it, think it restricts the htw

Can anyone tell me what the black square knob is for on the diverter valve - asked on other forums but no answers

Ok got intermittent fault and I know these are a pig of a boiler to work on Hot water fluctuates between hot and cold sometimes. The boiler continually runs when calling for water but i have noticed the htw pipe gets warm but the ch pipe gets hot even when the heating is off Checked sensor and...