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The pressures are "normal" while you are there, but what are the pressures as the frost starts to "grow"? Are the units in question freezing up significantly quicker than the others? Is the freezing the problem or is it a question of the strip heat not coming on?

First thing, determine if the problem is with the refrigerant cycle or wiring of the strip heat. The strip heat should be able to handle most heat loads during this time of the year (in general). If the stip heat can't handle the heat load alone, that isn't good. If the problem is that the refrigerant circuit isn't performing well during this time of the year, sobeit, one can take that issue forward. But, my primary concern would be that the strip heat is functioning first.

Good luck, as I am sure the "other" bright guys will have some good input.
 
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