If it is maxing out the pressure gauge (how high does it go?) and the pressure gauge is accurate but there is very little steam then theres 2 possible causes.
The first is that theres too much water in the boiler. The boiler should only be filled to about 2/3rds.
The second possibility is that youre seeing a false pressure as theres either no vacuum relief valve or its not functioning properly.
First make sure the boiler is filled to the proper level. Then open a steam valve and turn the heater on. Once there is a good stream of steam coming out of the steam wand turn it off. Pressure should then build to somewhere in the range of 1.1-1.4 bar and stabilize there. There should then be plenty of steam available.
If you start up in this manner and the pressure gauge maxs out something is wrong. Open the steam valve to relieve the pressure and power the machine off until you figure out what the problem is.
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