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    Updating Honeywell T40 Thermostat - too many wires?

    Perfect. Thank you. I’ll give it a go
  2. L

    Updating Honeywell T40 Thermostat - too many wires?

    Thanks @denso13. so earth and 2 capped. sorry to be a pain but do you know which to which on the new T4? photo attached again. I assume 1 to A and the other to B? sorry for being simple!
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    Updating Honeywell T40 Thermostat - too many wires?

    Hello @JohnD thanks for your quick reply. Sorry your right, light isn’t the best. I have the following connections in the existing T40: 1. Yellow and Green to earth 2. Grey to number 2. 3. Black to number 3 4. Brown to number 1. Spot on with the T4. So yellow and green not needed. Which...
  4. L

    Updating Honeywell T40 Thermostat - too many wires?

    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...
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