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Just hums away. The reset button never seems to light up despite the burner not working. Control box was my other idea. Waiting to get a pressure gauge from a friend this evening so I can check the pump.

Of course ;-) Gauge into the gauge connector would make perfect sense. Sure i have one somewhere... Seems to be 64V across the wires.

Thanks for the responses. I can't see a wiring diagram anywhere in the manual but i see the motor connector has 3 wires - black, white and blue. Do i measure between white and black? Not a whizz when it comes to electronics i'm afraid and it's been a while since i dusted of my DMM. For what it's...

Hi all, having some problems with my oil fired boiler. I realise there are a million and one of these threads already but can't find anything with the same symptoms so hope someone can help... Boiler is a Grant Vortex Pro (external) with Riello RDB1 burner. The boiler fires ok when the heating...