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This is a generic ignition failure error. Does the burner fire up then go out or does it not fire at all?
Ok, so the igniter is coming on but the burner doesn't fire up?
Ok, then either the main burner orifice is clogged or the supply tube to the burner is blocked or kinked or you have a defective gas valve. I'm assuming you are certain there is gas to the unit.
You need to first make sure you have gas to the unit. If you have other gas appliances and they work OK then you can assume you have gas to the unit if the gas cock at the unit isn't turned off. Then the next thing to do is to vacuum out the inside of the burner chamber paying close attention to under the burner. If that doesn't work then you'll have to pull the burner out and make sure the tubing to the burner is open and the burner is clean. If none of those work then you probably need to replace the gas valve but if this unit is more than 8 years old it's probably not cost effective to replace it since it's at the end of its expected life and could leak at any time.
I don't get your last post. I posted a long response
Do you have any more questions?