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Possibly... When you are running at 100% load the voltage across R10, R11 & R12 ought to be ~5.6 VAC based on my calculations. Or if at 50% load ~2.8 VAC. Check it if you get a chance the next time you run it at one of those loads. I too am looking at 12-20" of snow over here in Pepperell, MA.

Is the Red Emergency Stop switch accidentally pushed in?

Yes - the burden resistors are used in the current measuring circuit as well as the AM/VM switch. Sometimes just exercising the AM/VM switch will correct the problem. Any corrosion on it's internal contacts will result is poor connection which will result in the incorrect amount of current load...