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  1. R

    Honeywell ST9420C Issues

    Sorry I should have put this in the central heating forum
  2. R

    Honeywell ST9420C Issues

    I have recently had issues with my central heating and water system. When the hot water is on, the radiators are hot. I thought this was the Honeywell Valve head, so I replaced it. Problem still there. I then spotted that the ST9420C programmer wouldn't fire the heating (the water was off) when...

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