Hi,
Some units have a dead man switch, which means that if the filters are not in place correctly the blowers will not operate. Its a safety thing to prevent little ones from dropping toys into a running blower. Double check the filters placement, if the filters are in the proper location than I would look at the power to the blower unit. The vent has two jobs, (1) to raise and lower, (2) to turn on the blower unit once in the full up position. If this is not the case, the upper switch in the vent system has failed. If you already confused, you will need to call a Viking expert to correct this problem. Its not difficult but can be time consuming.
I hope this helps
I have seen this problem twice and found the filters were the problem, rarely replace blower motors..
I’m happy to help further over the phone at
https://www.6ya.com/expert/gere_bf68e6055dd61249
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