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Could be, but also inspect the wire going from your WeepMizer to the temp sensor to make sure there are no breaks, exposed wire, etc., in it. I had a GoldLine thermostat reporting odd temps and found the wire to the RTD had rubbed on a metal corner for so long that it rubbed right through the insulation and was shorting on the metal and giving false readings.
I just went thru the same thing. The temp sensors are most likely ok. The unit needs to be sent in for recalibration. This seems to happen to much with the Weep Mizer. The good thing is that it only costs around $25. Just give them a call and they will let you know.
IIRC -22 is the default temp you will see when no temp sensor is connected. As Randy said, broken/rubbed wire or bad sensor is the most likely culprit.
Years ago I had a dixmor wire rubbed at a c-channel purlin on a metal roof. My guess the wind caused the roof to move enough to rub the wire.