When you open gas , do you smell it? if not maybe venturi is blocked. can you light the burner with a lighter, if so gas is not problem. i think you have to do some troubleshooting first to eliminate the cause. if igniter works its a gas problem, if gas is coming in, its the igniter
SOURCE: Propane patio heater ignition problem
I would change the thermocouple and here is why:
The thermocouple is the pilot's, well, co-pilot! It is the electronic device that senses if the pilot flame is hot enough to sustain burning the gas fuel from the burner. If the thermocouple thinks it's safe, then it keeps open the main gas valve located in the pilot assembly. If the thermocouple does not sense enough heat from the pilot flame (such as when the pilot is out), then the thermocouple shuts off the gas valve to the burners.
How the Thermocouple Works
So what is this thing and how does it work? Well the thermocouple (technically called a thermocouple junction) is a device that contains two metal wires welded at the ends and placed inside a protective metal case. The thermocouple sensor is found at the business end of the pilot flame and is designed to be placed in the hottest part of the flame. The other end is connected to the pilot valve body. As the thermocouple heats up, it produces a small amount of electricity and when it gets hot enough from the pilot, send a signal to open the gas valve by using a solenoid operated by a 24 volt transformer. The thermocouple calls the shots, and by converting heat to an electrical signal, it allows the gas valve to open or close.
Once the gas valve is open, gas is then constantly supplied to the pilot and as required for the gas burners (as called for by the thermostat). If the pilot goes out, then the thermocouple gets cold and produces no electric signal to open the gas valve's solenoid and the gas valve shuts off the gas supply to the pilot and burners
SOURCE: LP gas conversion oven flame to big
I did all this and the flames are still huge inside the oven...
SOURCE: gas furnace, main burner ignites the other 2 don't. then shutdn.
Between the burners is a small rail in the pressed steel where the flame runs across to light the other burners and it sounds like there is dirt or debris in the step over rails causing the problem. You will need to use some compressed air on those rails to clear them out. Once the rails are clear the other two burners should ignite right away.
Testimonial: "I did not expect such a quick response. These are hard times for us and we really appreciate your help. Thankyou for sharing your expertise."
SOURCE: i have a pitco gas fryer. i light the pilot
it could be the thermostat is stuck open letting full gas rate pass to the burner
Testimonial: "thanks a lot very good advice"
SOURCE: MAIN BURNER WILL NOT IGNITE
Any RV sales and service dealer can get parts for you, if they don't already have them in stock. Is the pilot staying on at all? If yes, what happens when you turn from pilot, to On? One easy thing to try is undo thermocouple (probe that sits above pilot flame) from gas valve (3/8" wrench) and clean the end of the thermocouple with fine steel wool, as well as spray some WD-40 into the hole it came out of, and give it a blast of compressed air after to clean it out as well. (protect your eyes) Then re-install the fitting and snug it up good, and try lighting again. You may get lucky that it's just corroded or dirty, and this may cure that.
Testimonial: "very good info except my description of the problem was not detail enough."
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