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Pilot lights but when you turn it to on burner will not light. also is there a way to trouble shoot the high limit or some way to check to see if it is good?
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For (fire) safety, there is usually a thermostat that will turn off the gas if pilot light goes out.
So when you try to light the pilot you will have keep press & hold the pilot gas supply for at least 10 sec until the thermostat is heated up. Then only when the pilot light stays on continually, can you turn on the burner.
Forget about changing to a High pressure regulator!
clean pilot check flame sencor is clean , jump high leval limit first see if it lights , if not try low limit , check thermocouple is tight if fitted ,
The dryer must have a complete termperature circuit and no "high temp limit" failures for the ignitor to light. That means the door is closed, motor is running, and the cycle thermostat is less than 135 deg F and the High limit thermostat is less than 180 deg F just to provide power to the gas valve solenoids, ignitor, and radiant / flame sensor.
are you saying it lights back to the orfice ?? if so i would say the pilot needs cleaning out a long with the burner which could be blocked with dirt or fluff and at the airports to the burner , and the ignition could need cleaning ,
Check the hi limit sensing bulb, it should not touch the fire tube, when it does, it will sense high temperature which will trip its mechanical contacts and will shut pilot and burner flames. Make also sure that the thermopile is free of soot or any form of dirt and is properly heated by the pilot flame.
Make sure the high limit isnt tripped. There is a red button down next to the thermostat that you push to reset the high limit. If it will not light after that it is probably a bad thermocouple - This is the sensor located in the pilot flame.
Make sure it is well positioned in the pilot flame. If not adjust it into the flame, if so replace it. They are generally available at your local hardware store because they are also used in water heaters and home furnaces. They are pretty cheap and fairly easy to change. It ususally requires that you remove one or two of the main burners for easy access. Empty the grease first just to be safe. Remove the nut from the top of the drain valve handle and remove the handle. Look to the top of the main burner or burners in front of the pilot and there are two bolts on each burner that need to be loosened (not removed) and then lift the burner to remove the bolts from the slots and pull the burner down and out. Remove and replace the sensor (should be fairly straight forward), Replace the burners and valve handle, refill with grease, and try to light it again.
The Tstat has a capillary that looks like a thermocouple but it isn't, its a bulb with liquid that expands and contracts based on temperature. A pilot can go out due to a high limit switch being week or getting to hot and that can be shaped like a thermostat capillary or can be simply a disc with a button if even there is a high limit on your stove. There likely isnt. So see the next suggestion.
I suggest lighting the pilot, turning on the main burners while watching the pilot. If the pilot shrinks in size, then check your gas pressures before and after turning it on and seeing if there is a wide variation. I would suggest the pilot is dirty or the pressure regulator is faulty.
if burner lights after jumping valve you have something wrong in thermostat loop. disconnect the 2 thermostat wires on gas valve and use multimeter on continuity setting. if all wires ,connectors and components are good,you will get a tone.since you have jumped out each component in thermostat loop with no success ,i would suspect a bad wire or oxidation on a terminal .
Assuming that your make up air and exhaust hood are properly balanced, no negetive pressure conditions exist, your gas manifold pressure is at 4" wc, your air/gas mix on the burner set correctly, the your problem would be the pilot adjustment. If the flame is not intense enough flame to survive the sudden air shock, it will go out.
The pilot height should be about 1 1/2". Your Pilot orfice could also need cleaning. Eliminate excessive draft in your kitchen.
Here is the manual for your unit, it covers these topics.
It could be a faulty high limit, you can also check the high limit probe to insure it is mounted securely against the through tube wall in the grease. Also check the burner, there are baffles that run through it and when they get old the flames don'tmove though the burner correctly and will cause the high limit to trip prematurely
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