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Del_UK Do you mean turn off the steam boiler or just not have any preinfusion? If so I got it just now with just a stright shot, no 10 second bloom, just 8.5 bars. It still spiked up to about 10 bars and the second shot rose to 8.5 and stopped.
Everything off, probably even steam boiler (even though it shouldn’t matter)…but certainly both preinfusion functions (one is referred to as bloom phase). Effectively turning it into a dumb machine.
If it still does it, more evidence for a water hammer effect due to air…well that’s the theory.
P.S. If you turn off steam boiler…wait until it’s below 100C