In message , Adrian Berry
writes
I tested the modureg resistance last night - can't remember the value but
it
seemed right at the time, definitely not a short.

But did you test at the loom connector that goes into the pcb or at the
gas valve ?


Checked the resistance across the terminals of the solenoid with no loom
connected.

Too awkward to measure the output voltage on the pcb as I didn't want to
disconnect the thermistos which are on the same loom.


NO

remove the molex connector from the pcb, measure the resistance across
the pins which go to the mod. The idea is to test the whole path, there
might be a short to earth caused by a chaffed cable or something silly



--
geoff