Do you see any flame at all before the lights start flashing? If not then start by checking your igniter. You can test it with an ohmmeter or the easiest way is with a clamp on ammeter. With the ohmmeter you disconnect the igniter from the circuit board and insert the meter probes into the igniter leads and read the resistance. If it is open then it's bad. With the clamp on ammeter just clamp it around 1 igniter wire and turn the unit on. It should show somewhere between 2 - 4 amps. If it doesn't draw any then it is bad. If the igniter is bad then you will need to open the combustion chamber and dry up all the kerosene that has been pumped into the burner pot. Let me know what you find and if it's not the igniter I will give you some more stuff to check.
Something else I forgot to ask is do you hear a ticking noise while it's trying to light. The ticking noise is the fuel pump not getting any fuel. You would need to check your filter and possibly the strainer in fuel sump. When checking the strainer in the fuel sump, turn off the fuel at the tank and have some rags ready to catch the fuel that is going to come out.
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its a 41 and 4 lights come on for a few minutes then all lights flash
41 4 lights come on for a few minutes the goes out then all lights flash and getting fuel to chamber
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