Water heater not turning on using propane.

[coralcruze]

When using the switch at the sink to turn on the water heater I see the red light and can hear it firing and then a few seconds later the light turns off and water heater does not light.

I am thinking that I need to get in there and do some clean up and maintenence. I know it's a suburban 6 gallon water heater. Does anyone have a check lost of things that need to be maintained and cleaned and perhaps directions on how to do it? I checked the annode rod and electrical element and all good there.

Thanks in advance.