I have a crown gas fired boiler with a honeywell L8148E aquastat that has a pilot , circ pump runs . But when turned on it will not ignite. The system is only 3 years old and last year a flood came over the gas valve but I let it dry then blew it out with compressed air and it worked great all last winter. I am good with this stuff and totally stuck, jumped t to TV to rule out thermostats and nothing

If the gas valve has been under water, it's toast.