Is this NEW? Or did it just fail spontaneously after working for awhile?
Is this just a remote control issue or is the sub dead, too?
From the manual...
No sound coming from subwoofer.
If hookup is "SUB OUT" to LFE, check and make sure your receiver is set to Subwoofer=YES. If hookup is via speaker wire, check that the polarity of the wires is correct.
Subwoofer has no power.
Is the AC MAIN switch on? Check outlet; check fuse after unplugging the subwoofer. The fuse is located under the power cord
receptacle. Fuse type and rating is found on the back panel.
Remote control doesn't work.
Remove the plastic tab to activate the remote control's battery or try replacing the battery. Ensure the IR sensor is not blocked.
If it's a new problem with a previously working remote...
It describes a way to possibly fix your remote or at least prove it works or doesn't.
Find new or replacement remotes:
or eBay: search for "(model) remotes", check the 'include description' box. Usually cheaper than the vendors.