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Discuss Heatmiser UH3 troubleshooting in the Electric Underfloor Heating Wiring area at ElectriciansForums.net

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Hi fellow electricians,

Wondering if anyone out there can kindly help me out? I have a underfloor heating controlled by UH3 heatmiser.

When thermostat control is activated, there is no boiler response and hence no heating.

Has anyone come across a similar problem? Is it a relay fault within the UH3 unit? Any other possible reasons for this (water pump?), etc. Any simple test to pinpoint fault?

Picture of indicator lights shown when zone heating is activated:
756EACB5-D3F2-49E1-B846-E657DF99C7C4.jpeg

Thanks in advance!
 
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