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Gas valve is turned to ON position and pilot stays on yes?
Do you have a thermostat or just the remote ?
Have you checked to make sure the manual reset limit is not tripped?
Just come back to this page. Also turn switch remote off and see if fireplace will light by turning knob on valve.
Will fireplace come on manually with switch for remote off and using knob on valve?
Ok so we know issue has to be in remote or receiver. Lets try a new set of batteries in both.
Not sure why it could have gone bad by just not being used, but is apparent the remote is not working.so you may have you replace it.
Wish I could be more help.