Hi
Exactly the same situation as you - there is a dial on the back of the remote, turn this one click and press the 'flame' button, it should turn on if you have the correct frequency (the switch is a frequency selector).
Sometimes the fire can 'crash' as in stop responding (usually when you press the 'I/II' button on the remote) in this case, you will need to power off the fire and power it on again to get it to respond (the big red switch at the top side). The light under that is the 'heater on' light (from what I can gather).
If your fire stops responding when you press the I/II button then it may need some repair/maintenance. I have this issue and am looking for solutions to it at the moment (which is why I saw your post)
Anyway, hope this helps.
Regards
Ian
Ian Hawkins, February 2012