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Just in case anyone else had the same problem of the boiler pump running continually... I think I found the problem and it was nothing as complicated as a faulty component: I'd left the store temp on the tank too high after putting everything back together when I replaced the dead capacitor...

Thanks to the helpful and detailed info in this thread I've been able to fix the continuous buzzing that started 2 days ago from the bottom relay (by replacing the axial capacitor C3 on the delay timer PCB). The hot water and heating now work fine, except that when the boiler stops firing...