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st9420c1008

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    Replaced Horstman 527 with Honeywell ST9400c and Hot Water will not fire

    Good morning everyone, Looking for some pointers. As the title says we replaced the old broken one with a new ST9400C. Transferring the wiring didn't seem too bad at all. I have attached a pic of the old wiring. Basically one wire for CH, one for HW and the loop from Live to 2 and 5 for...
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    Replacing a UP2 controller unit

    Hi, I have just moved home and the new house has a Worcester 30 CDi boiler with a UP2 dual controller. I know it is an upgrade, from my last house, but it feels like a bit of a downgrade. In the old house we had a Worcester 28 CDi and a Honeywell CM927 wireless room stat/programmer. I believe...
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