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Thank you for the information, the customer found the installation instructions and traced the issue to a faulty external sensor that was not installed in a weatherproof housing so had corroded. Had a replacement made with a dedicated housing and probe from an electronics company. Works...

I know the switched from the 2 port goes in but everything else disappears into the wall

Inside

Thanks, Yes I assumed that as well as it is next to the Heatmiser underfloor UH1-W control centre. They didnt know what is was or what it did. When the underfloor stat kicks on the green light comes on (heat), but when the 2 port motors across the red (boiler) light sometimes flick on and...

Hi, Has anyone seen this unit before and aware of its function, it is installed on a Aga running underfloor heating including a wood burner. Thanks