The probes do require replacement from time to time, but if I were you I'd be grabbing the spanner and having a look. The top of the boiler is pretty accessible. The wrap-around stainless shroud for the whole machine is the only test - it is made of something like 4mm stainless! I would take mine off and slap a picture in the thread but we have guests arriving in about 2mins...Like I said - this is a trivial fix, assuming it is just the crap from the water making a nice insulating sheath over the probe...
Cheers
/Kevin

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