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Code 66 (fan running too fast) on all filters except the most basic ones. Is this normal?

Post created: 2015-07-29 Type of Equipment: Furnace Views: 172

This question was created on the page: https://www.furnacecompare.com/furnaces/ruud/achiever-90-plus.html.

On 2015-07-29 wrote:

BTW it's a Ruud Achiever 90 Plus unit

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