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Sorry, major typo in my original mail: It is a Worcester Bosch 35CDi Mark 1 - yes the one with two pumps in. How does one get a restriction between the plates?

I have a WBosch CD53i (Mark 1) which has recently started to Lock Out after running Hot water demand for a long time (e.g. Filling the bath). Short bursts of demand are ok. According to the installation / servicing manual, the fail point (G) indicates to check the CH pump is working, then the...