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    Nest controls my Idea Logic 15 but yesterday, when I selected Hot Water, my water was heated but it refues to shut down displaying 'C'

    Apploogies, as I have had a hospital emergency in the family, so my boiler issue has taken a back seat for a few days. Well, one of the Micro Switches was realy warm & by manually turning it off, I could control the boiler & thus the gas / electric consumpton; could this be the issue? However I...
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    Nest controls my Idea Logic 15 but yesterday, when I selected Hot Water, my water was heated but it refues to shut down displaying 'C'

    Do you have any idea whether it would be the return valve or the cold water valve? How do I know which one it is? Do I just take it apart & see the results, then repeat for both motorized valves? This way I can hopefully isolate which valce is causing the problem?
  3. P

    Nest controls my Idea Logic 15 but yesterday, when I selected Hot Water, my water was heated but it refues to shut down displaying 'C'

    A few days ago my central heating system seems to have developed a problem. My boiler is an Ideal Logic 15. It appears that the Nest thermostat is working fine but somehow the boiler thinks there is a constant demand to supply heating / hot water as it displays a constant 'C'. Usually the...
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