Surge protectors don't trip, do you mean the RCD (safety switch)? If a coffee machine is tripping an RCD it's usually due to water / steam, often a leak inside the machine. It could be a leaky element seal or water getting into the controls somewhere. I suspect that if you fix the pressure release valve issue this will clear up. If it continues after that report back and we can fault find it and clear it up.There also may be an elecrical problem in that it tripped the surge protector a couple of times but that hasn’t happened the last two times I powered it up.