If you plug your EM6910 into the wall and it starts running the main water pump straight away its because the triac (AC switch) has failed.
The triac is used for the coffee pump, steam pump, and for the pressure relief solenoid so all could fail in the same fashion but the main pump draws the most current so is most likely to fail.
It is the component labeled Q1, Q2 and Q3 on the circuit board
I think they cost about $1.60 from RS components.
Make sure to have machine unplugged from all before removing circuit board and label each wire before removing it.
part no: 2N6075AG

The triac is used for the coffee pump, steam pump, and for the pressure relief solenoid so all could fail in the same fashion but the main pump draws the most current so is most likely to fail.
It is the component labeled Q1, Q2 and Q3 on the circuit board
I think they cost about $1.60 from RS components.
Make sure to have machine unplugged from all before removing circuit board and label each wire before removing it.
part no: 2N6075AG

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