From my experience in a restaurant, those large commercial rooftop refrigeration/freezer units need attention several times a year. It's rare that your home fridge would have trouble that often but commercial units are more complicated and in a harsher environment. And supermarket installations are probably even more complicated.

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forgetfreeman 6 hours ago | parent [-]

Routine service and maintenance doesn't require net connectivity to schedule.

	▲	ssl-3 35 minutes ago \| parent \| next [-]
		Not all issues are routine. So we schedule service, and then we throw away all the food anyway because the problem cannot be addressed remotely.
	▲	SoftTalker 5 hours ago \| parent \| prev [-]
		Agreed. I was just addressing that it's not exceedingly rare to need to get a tech out on site to address something. Should the manager be on top of this, checking temps on all the cases every day? Absolutely, but I can see the argument for a more automated system of monitors/alarms that can get a tech dispatched before the manager has even noticed the problem.