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Why do the fans on the 8803 unit in question not come on at all and unit eventually trips on OHF / thermal overload?

If fans are not running at all this could cause an OHF / thermal overload condition due to unit overheating.
Since fans may not be operating need to verify if the proper control voltage is being supplied to the fans.  Also check the wiring to fan and confirm it is not wired incorrectly to the transformer which could cause its non-operation.  If the fans have the proper voltage and wired ok, then suspect have a bad fan.

CTA-ID : 2002953
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