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Just got done descaling, insulating the steam boiler and putting the v2 back together. Upon start up the brew boiler and temperature and bar pressure are fine . The steam boiler heats up but will not give a pressure reading on the manometer. When I try to get hot water or steam, nothing. I can hear hissing out of the small relief valve. Perhaps something electrical? Any thoughts?

Sounds like the relief valve is stuck open. Tap it on the top once or twice to see if you can get it to pop up and reseal. Otherwise, you have have to remove it and clean it.

The relief valve moves up and down freely.

Are you sure that the steam boiler refilled? If not don't let the heating element run.

Boiler refilled and heats up. Just can't get a pressure reading on the guage and no hot water or steam.

Problem fixed, or should I say there never was a problem. The steam that was emitting from the relief valve is normal. I just never saw or heard it because I have never heated up the machine with the side and back panels removed. As the boiler starts to make steam, the pressure from the steam causes the relief valve to pop up and seal, which in turn creates the pressure to force water to the hot water dispenser and steam to the steam arm. I wasn't getting water or steam because the valve hadn't yet closed when I tried to dispense hot water. So here is a picture of the finished descale and boiler insulation project.