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Thanks! Can the microswitch be cleaned/replaced or does the whole valve need replacing (it was only about 18 months old when the fault first started)?

i wonder if anyone could help out with an extremely annoying intermittent fault that has been on our central heating system for a few months. basically, every so often, we go through a period of hot water working fine but central heating not. we've got an S-plan system with two 2-port...