M1 and similar super automatics have quite a few "lock out" functions. Some can be bypassed temporarily but most require some cleaning or scheduled maintenance. Call your vendor to check. Most common are (in frequency order)
1. Cleaning cover was unintentionally lifted. You must perform cleaning cycle to clear (8 mins to perform).
2. Scheduled cleaning (before start up, mid day, end of shift, end of day depending on what was programed in.)
3. Scheduled Maintenance (tech required to clear - just like your car maintenance light.)
4. Semi annual and yearly Maintenance (same as above) This is a Must! Gaskets, filters, valves, switches needs cleaning or replacements.
Note; There is quite a few places in the M1-5 series that accumulate coffee dust and grounds. Especially when fine grounds for extreme creme settings on grinder(s). Operators may forget to empty the coffee "pucks" which fall behind the dregs slot and get into the inner workings. Especially if you find coffee grounds or dripping liquids under the machine. Don't let operators keep syrups on top of machine as the spills drop into the internals. Qualified maintenance is a must for all super automatics. Remember as a owner operator of a fine tuned espresso machine you might get away without the "Super Barista" labor. So use that savings to keep your machine in top condition!
ukeboy57
Machine might have calling for a clean cycle for a while, if it does not get one it lock up until cleaned.
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