Okay, we've checked all those as far as we can tell. Going by the fault finding matrix it all points to the over heat cut off device, but should this not make the lock out light come on (it doesn't)? Also when we check the pump overrun thermostat we get a closed circuit on the black and brown...
Our Halstead quattro gold boiler stopped working a couple of weeks ago. We have no hot water or central heating. No lights come on to indicate lock out and the burner light doesn't come on either. We have followed the fault finding matrix in the installation instructions. The pump starts but...