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A 4 flash error is an open limit circuit error.
You can try resetting the rollout switch(es) (see attached pic for typical). They are located just outside the burner chamber. Turn off the power then press the small button between the 2 leads to reset it. If it clicks you have reset it and the unit will fire up when you turn the power back on with any luck. If it doesn't click it wasn't tripped.Check to be sure there isn't more than one by tracing the leads connected to the switch.
Then you either have an open limit switch or a bad connection in the limit circuit. Tracking these culprits down is best left to a pro.
Based on your description of your capabilities you've done all you can