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Thank you, that worked a treat! I've attached a photo for anyone else encountering this in the future...

Hi, I've just swapped out a H37XL for a H3747, I have two heating zones + water. I used the existing backplate (photo enclosed) and bypassed the two Honeywell wired thermostats by joining live and switched live together (terminals 1 & 3 - photos enclosed). The problem is that the boiler does not...