Gremlin in Munchkin wall boiler

MAQ Crook

My munchkin boiler won't light. I checked that it had spark- it has! I opened and it smells of gas. I checked the stack and it is not plugged. I blew out the drain by capping vents and turning fan on full. The LP gas tank is 80 % full. The munchkin still won't light. It ran yesterday great after cleaning. Each time of the year when the seasons change this happens for a few weeks. I have domestic hot water and radiant floor heat. The dom water worked all summer with no problems but as cold weather hits it goes through this mystery every year for 3 seasons now since installation.
MAQ Crook in PA

kevin coppinger_4

is the ...

spark going to ground and not allowing it to ignite...wet refractory....kpc

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MAQ Crook

Dry refractory?

Should i just keep fan on for a long period of time to dry out to dry the refactory? If the gasket to the spark igniter is not connected well should I make a new one with rubber for tempary fix?