honeywell t40

Hi I'm looking at replacing my honeywell t40 with a hive - i thought it would be a simple switch, and maybe it still is but there are more wires than I expected. Not the like for like swap i thought or do I just need help mapping the wires? Thanks in advance, new here but looks like a good...

Hi, I’m trying to update my old manual Honeywell T40 thermostat to a programmable T40 on a combi boiler. the man in the shop said nice easy swap but once I removed old I found there’s too many wires. I think the T4 only needs 2 but the old T40 has 4. Is it a simple problem to solve or do I...