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    Which wires for cm907 to replace mechanical clock on Baxi?

    Help! I'm trying to replace the mechanical clock on a Baxi combi boiler (80e). It's got a round mechanical clock with 2 black, 1 brown and 1 blue wires. I tried connecting the blue and brown to the Honeywell cm907, but this blew the boiler fuse... Should I have used the black wires instead? (The...
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