Does the sentence contain faulty parallel structure? the schools not only were closed because of the snow and ice but also because of the lack of heat.

Yes, the answer is faulty.

Explanation:

In order for the parallel structure to be complete you should try dividing the sentence in this way.

-The schools not only were closed

- because of the snow and ice,

- but, also

- because of the lack of heat and water (for example)

The parts that begin with because should contain the same structure, in this case two nouns divided by and.

it is grammatically incorrect and is illegible to me and i can not answer it.

he was looking for nothing because this question had no complete sentence.