Is there any way i can bypass the thermo coupler to open the main gas valve to check if it is the thermo coupler

Make sure the thermocouple is deep into the blue part of the flame. If it is good, then the only part left is the defective main gas valve.

Ignite r is bad if amp draw is to low on ignition glow will still glow but its telling the brain its not glowing so valve will not open change glow or thermo coupler it should solve your problem

Did you clean the pilot orfice?? It has a very small opening about the size of a hair. You may have to use a needle to open the opening....Are you getting gas to the pilot orfice assembly from the Gas Valve when you set it to Pilot?? If not then check the pilot adjustment screw on top of the gas valve at the pilot tube. CW decreases flow.

see if 24 volts ac to the brown and yellow of the gas valve if voltage need new gas valve if no voltage need new fenwal

Check the thermocouple,Its is a flame senser.It will not stay lit if it is bad.

i should have seen that, sorry.
TDoes it go out when you turn the main control to on? If so, The thermo coupler appears to be not working. The thermo coupler is that bulb that is at the tip of the pilot flame. and has a small tube going to the main valve. It controls all the gas and shuts everything off if the pilot flame goes out, including the gas to the pilo. That is why you have to push the button to light the pilot. Ot bypasses giving the pilot some fuel. to lite. As mebtioned, if the thermocoupler goes bad nothing will work so I think changing it will solve your problem. If the coupler is not in the flame, try adjusting so it is and see if that helps Good Luck -Ned-

Thermo coupler may be defective. it controls the main gas valve by closing main if pilot is out. make sure thermo coupler bulb is positioned over and near tip of pilot flame, but not in the flame. Thermo couplers are inexpensive and easy to change out.

Thermo coupler is held in place with a clamp bracket at the pilot end and a small brass line nut on the other end going into the gas valve.The pilot flame must surround the sensing bu or wrap itself around it Press the pilot button for a few seconds and fire up the pilot flame. Wait a few more minutes and turn the gas vale on for the main burners. If it fires, your set.Good Luck,Ned

Bad Safety valve. (valve w/red button). Thermocouple keeps the magnet open to keep pilot and so gas can flow to burner. Make sure pilot is clean and strong and hitting thermocouple. If it doesnt stay lit replace Safety Valve.

My suggestions,

take the electrical wiring off the terminals of the gas valve one at a time, and clean the contacts with a food grade electronics contact cleaner and degreaser. Make sure all wiring is tight, not loose fitting, and clean. The thermo coupler, or sometimes used thermopile (multiple thermocouples in one) generates a small amount of electrical current when heated. The oil residue on a gas valve's electrical contacts SHORTS OUT THE MINUTE CURRENT GENERATED not giving enough current to hold the valve open.

The next thing, how high is your pilot set? If the flame is not striking the thermo pile properly, if its not directally in the flame, it will not generate enough current to hold the gas valve open. Sometimes a dirty thermo pile just cleaned up with sandpaper will work again (accumulated material acts as an insulator)

If you have access to a very high end electrical meter that is capable of measurung MICRO AMPS (very few) then you should check the actual current ouput of the themo pile.

Another thing, the gas valve solonoid MAY BE DEFECTIVE! IF YOUR THERMO PILE is of the screw in type vrs screwed on type, remove the gas valve end, degrease the inside and also that of the thermo pile surfaces, then use the CLEAN errasser of a pencil to clean both the inside of the gas valve connection, and also that of the thermo pile contacts. NO ERRASSER RESIDUE CAN BE LEFT ON EITHER SURFACE! Do not touch these contact surfaces with your hands because even the resistance of the body oil on these surfaces can mean the differance between it working or not!

The thermo pile or a thermo couple generates a minute amount of current that holds the gas valve on.

PS: and that didn't even cost you a dime, I'm off to an emergewncy service call to fix yet another McDonalds deeping fryer (don't call them beeping fryers cause they beep either!!!)