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Hi, I'm Mike G and I'll be assisting you. If you changed the dip switches on the remote and it operates another fan, your problem is either no power or the receiver has failed. You'll need a 2 wire voltage tester and be able to open the canopy of the non working fan to determine which it is. Do you have a tester?
That being the case, either batteries are bad or in wrong if changed
other than that the hand held remote is bad and needs to be replaced.
Go to the link below.