A lot of times, reduced air flow will be the culprit. There is a sail switch that measures air flow in the ignition/flame control circuit that must activate to complete the circuit for ignition start up procedure to happen.
Check for mud dauber, bee's nest, or other crap in the intake and exhaust of the furnace.
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2000 Roadtrek Chevy 200 Versatile
Fun stuff:
'15 Kawasaki Versys650LT
'98 Kawasaki KLR650
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