I wasn't trying to knock the Corgi status but I couldn't see why removing a few screws and a lead meant you had to be Corgi qualified I understand now. As I stated before is there any other checks that I can do before I splash out on a new PCB.
get a engineer to check or change the probe .pcb,s on the 105 pretty reliable more often than not they just need a clean and adjust esp if does not happen all the time
The front pressure gauage is for System Water Pressure NOT GAS.
You need tools and knowlege to test a gas pressure as described, You need a RGI and last one i had playing up was a bad gas valve. replaced and was fine.
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