Originally posted by teds01
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The gear motor current draw will not show on the screen during the test.
I've had another thought; in Saeco machines, the big power transistor that drives the gear motor can go bad and cause it to slow down. If for some reason it's operating correctly but then overheats or breaks down in some way whilst driving the motor this may trigger the error.
This is certainly a cheaper and easier option than pulling the gearbox and replacing the gear motor.
The transistor is a TIP33C and is available from RS Components. You will also need some thermal paste, soldering iron/solder and soldering skills.
The transistor is mounted to a fairly large heatsink on the main power board.

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