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The click is likely the 3-way solenoid operating. Sometimes this is masked by the pump.
Have you had any pressure issues or problems with scaling?
rodabod-
I've descaled fairly regularly, and managed to get one done as this issue started arrising which didnt seem to help. That's not to say scale definitely isn't a problem...
Think the issue may be exasperated by heat. It works fine first thing and then I turn the unit off, if I turn it on again whilst its still warm from last time, it is most likely to fail me. Does that help any kind of diagnosis?
Scrabble
OK, gaggia classic has started playing up. Sometimes, the pump just doesn't seem to work. Rather than the loud sound of the pump, I get a much quiter buzz and noticeable click as I turn the pump on and off, with little to no water getting through. Sometimes though, its fine and turns on and off OK, enough to make a cup of coffee fine.
The steam wand seems un affected.
Anyone got any clues besides get a new pump? Is there anything else it could be? Worried I'll pull the thing apart, put a new pump on, put it back together to find the same problem/doesn't work at all cos I've ballsed it up.