Oh, oh. I just had a caffeo solo with exact this issue. I tried to replace the microswitch of the power button, without success. So it might be an issue on the motherboard and I didn't look further. My first advice is to open the device and pull off the cables leading from the front plate to the motherboard and connect them again - perhaps the contact ist bad. My second advice is to replace the microswitch, a standard Cherry D44Y. For that you have to remove the front plate. (It is secured by four screws in the Corners and one screw beyond the coffee spout, which also has to bei removed). If this all does not help (and you live in Europe) think of shipping the caffeo to Melitta Germany, they do all repairs at a fix price of about 150€. (Your caffeo will be nearly new)I wish you success!
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Reviewed the right sidebar questions for help in diagnosing your problem? How old or how much water was run thru? Are you in a hard water area with deposits building up in water lines, this coffee machine internals? Does your owner's manual have procedures for periodic cleaning of mineral deposits that can interfere and affect sensors within the machine? There may be youtube videos addressing the same issues.
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@marksears45771 Your videos did not upload successfully. Please try again Adding images to an existing question
crwdns2934271:0crwdnd2934271:0 Andrew S crwdne2934271:0