I’ve got a Worcestor Bosch 37CDi going in my house right now.
Can I ask what’s wrong with the turbomax?
I’m going to have a stab in the dark here, I maybe wrong, but I think that
It’s the old turbomax
The pcb has blown
it’s had a new pcb
it still won’t work, and it looks like the pcb again, would that be a fair guess?
If it is, then it’s probably the diode in the gas valve lead, and it’s taking out the green resistor on the board.
Other than that, I can’t think of another fault that would not be diagnosable within about ten minutes
EDIT: Turbomax has the aps mounted outside of the combustion case from memory, if that’s the case, the tubes can trap condensation causing intermittent failure.