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The soot or carbon have probably build up inside the fire tubes, better check and have an authorized service technician clean them.
Make sure that the fryer is receiving the rated gas pressure and correct gas type as stated on the nameplate, this way, carbon or soot formation on fire tubes can be prevented
pilot is yellow cause its air mixture hole is blocked or you have something in pilot stem like a spider web i have had this problem on flame effect gas heaters during thier off months spiders get into pilot stem and create webs which can cause this the other reason is that the air mixture hole is blocked with carbon or something clean out to get blue flame, and an example of yellow flames in gas heaters is flame effect fires where i know a certain company cover air mixture hole on burner to get the flame more yellow and realistic looking but on a service i remove the foil they stick over hole making flames blue again, as it can cause the heater to carbon up to the extent of black glass with yellow flames
I'm having the same exact problem... At first we thought was the vent... but the way the flames goes out... it seems that there is "not enough oxygen" more than "blown out by the wind"... right after both main & pilot goes out, I can't even light any external flame inside the chamber... and it doesn't feel like the outside cold air coming in... it just feel like there is some sort of gas in the chamber that's so strong, it prevents flame... and the only thing I can think of is that it doesn't have enough oxygen, but too much natural gas, and flame can't sustain.
ONLY ONE OR TWO THINGS AT FAULT.YOU HAVE A BAD THERMOCOUPLE.THIS IS PROBLEM 90% OF TIME AND CHEAPEST REPAIR.IF THIS DOES NOT SOLVE PROBLEM GAS VALVE IS BAD.HOW IT WORKS:THERMOCOUPLE WHEN HEATED WITH PILOT FLAME CREATES ASMAAL ELECRTRCAL SOURCE THAT HOLDS A MGNET OPEN AFTER HOLDING THE PILOT DOWN FOR ABOUT A MIN..THEN TURN GAS VALVE TO OPEN POSITION AND MAGNET WILL HOLD GAS VALVE OPEN.IF GAS VALVE DOES NOT STAY OPEN IT USUALLY INDICATES BAD GAS VALVE
Faulty gas valve coils are the typical cause of this type of "cycling". These electrical coils are right above the gas valves and when energized, these solenoids open the gas valves and permit the burner to light. If any gas valve coils are suspected of being faulty, it is recommended that both (all) be replaced at the same time. Hope this helped and best wishes.
Turn off the gas. Remove the unit. Disconnect the thermocouple and pilot assembly. Clean the white powdery stuff out of the pilot assembly. Reconnect and try again.
If that does not do it you will have to replace the pilot/thermocouple assembly.