Marzocco GB5
I had recently reminded this small cafe that the GB5 was due for a PM and we had planned on making an appointment... Then the steam boiler was shutting down and the LED read 'Steam Boiler Empty." The GB5 has 2 level sensors - one to alert the unit to refill the steam boiler when it is depleted from steam or hot water use & a second sensor to shut off the heater if the boiler is not refilling. If the second sensor is activated, the LED reads "Empty" though the boiler is still far from empty. If the system works as designed it will avert a much more expensive Heating Element Replacement.
As part of a Preventative Maintenance Service we always remove the sensors and inspect, clean or replace appropriately. In this case the sensors were badly fouled with thick, dark, very hard crust so replacement was the best option. Otherwise the PM was typical and we recommend more frequent change out of water filters.
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