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Heating circuit getting hot when hot water is running

When a hot tap is running on my Halstead ace combi boiler the heating circuit is warming up aswell, all heating controls and thermastats are off. The hot water is hot and apears to be working fine but the flow pipe from the boiler is getting hot aswell and eventually heating the rads.
The diverter valve has been changed but the problem hasn't been solved, any ideas?

Posted by nckrawson on

  • nckrawson Jul 12, 2009

    When the hot tap is turned on the pin moves over on the left to engage the microswitch( this is on the diverter valve)and the ch pin also pushes up, apparantly this is normal?

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  • 16 Answers

Check to see if diverter valve is in domestic mode or heating mode.

Posted on Jul 10, 2009

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