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Thanks for the reply - fingers crossed it started working - must have been an air lock Useful to know about pump settings

We have an old VCW242 boiler that has had a leaking dhw heat exchanger I’ve just replaced the leaking dhw heat exchanger and diverted valve, cut wire W18 as per instructions (hybrid model with plastic thermostat dial) Diverter valve moves to left when ch is on, moves to right when hw is on and...