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Hi Im new to this forum so hello to everyone.

Im a commercial industrial heating engineer. I have a good knowledge of work with opentherm but nothing regarding it programming.

What i need is when an OT boiler has a fault i need it to simply switcha relay to turn on a light. This in principle is very easy but i have no clue how to do this.
im also suprised no commecrial manufactures have a simple pcb to do the function. Although vaillant produce it but much larger to do diffrent things so i know it can be done.

I would appreciate any help you coud give me.

Kind regards

Hilton

The OT Gateway has configurable outputs, originally intended to drive LEDs. You can configure one (or more) outputs to come on when the boiler reports a problem (e.g. LD=M, which is actually the default). If you connect some simple circuitry to that output to drive a relay, I think you're all set.

Thank you very much HVXL il look into it