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Howard
Jonny69
I took another 1/4 turn out this morning which technically ought to drop the pressure down to mid/high single digits, i.e. low enough that it ought to start struggling to push the water through. It's still rushing through though, so I think the OPV is indeed stuck and it's just running at full pressure. Portafilter pressure gauge time, because I guess I'm going to have to strip the valve to descale it and I'll need to set the pressure again. Also taken the opportunity to get a blind basket and some Puly tabs because I've never actually backflushed this machine either.
Can't moan too much, I've had it for 12 years now and never really looked after it other than the occasional descale and replacing the group head gasket.