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Both CH and DHW down. Re-pressurised system and no effect. Tapped pressure sensor with little hammer and warning light went off. Changed pressure switch and all back to normal. On taking out switch noticed a lot of crud stopping flow to switch. Now cannot control pressure and overflow coming...

I think a lot of you guys have missed the point. As an ex BMW senior technician and current senior chassis engineer for a major manufactuer I feel I am qualified to comment. I do not believe the issue is with the car or the driver going from FWD to RWD. It's more likely understanding the...