Did you take photo of wiring before disconnecting old switch...you might have wired wrong.
Rewire old switch and see if same problem exists.
Check that new switch is rated for same device.
Attach 2 photos of old and new switches, each wired...so expert can see problem better.
http://waterheatertimer.org/How-to-wire-switches.html
Test that fan switch is getting power.
Gene
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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