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    Potterton EP2002 to Honeywell ST9400C

    Most grateful for your help with this Stem. Everything worked perfectly as you described. Apologies for not updating you earlier. You are a legend
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    Potterton EP2002 to Honeywell ST9400C

    Hi Stem Thank you for this. I am generally clear on what needs to be done. I am looking to complete the installation tomorrow. What do you think is/should be the earthing arrangement for the step. It’s not clear from my current ep2002 wiring and not sure what it should be for the swap. Many...
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    Potterton EP2002 to Honeywell ST9400C

    Hello Stem, First of all thanks for the instructions above. I feel more confident moving forward to attempt swapping my EP2002 for THR860S (Homexpert by Honeywell). The wiring on my EP2002 is however a bit different from the other user. Moreover whoever installed appears not to have used the...
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