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Hi, I'm Mike G and I'll be assisting you. Whither the fan/light operating I suggest changing the battery to see if that is the reason for lack ofcontrol. With a battery change and no results, the issue is a failed receiver in the fan. The only thing to do is replace it. It isn't serviceable.
Check that the battery is installed correctly and then check the dip switches to verify they match the ones on the or in the fan. You'll need to access the receiver to check switch settings and or replacement.
If it is a universal, any home center will have replacements for around $20.00. If the receiver using the fan body the link will be thebest source.