Washington Condo Association requiring improvement without assessment

I am a member of a Washington Condo Association.  Our Board of Directors is requiring all units to install new heating units without an assessment, which is very expensive.

The Board is also saying that, if the deposit is not paid to the service company performing the work, they will include the assessment in our dues.

Can they require us to change our heaters without an assessment, and assess our unit if we don’t pay?