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It needs replacing. It's a Honeywell, it's a three way job, it's got a "pimple", it looks like a v4073a, but I cannot find "v4073a" printed anywhere. Inside the cover it says "Sundial Y plan 3 Position Diverter Valve." Also "Made in Canada 40003279-002" On the front of the case it...

I have a 20-odd-year-old Baxi Bermuda 401 Gas Central Heating system. When I try to switch on the heating, nothing happens. No click, no thump, no woof from the boiler lighting up, no big flame in the boiler, no heat in the rads. I do get a light on the Honeywell ST699 controller. The room...