The pilot will light, but goes out after releasing the control knob. Detached lead to the pilot electrode, resistance characteristics similar to known good electrode.
pilot will go off every so often, changed the pilot and thermo copler, and still have the same problem?
I have a dean commercial fryer model M35/M40GM replaced the gas valve with a honeywell part # 8071604 then a thermopile 2 wire part # 205T102 pilot still will not stay lit. please help. thank you. rose & bob
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Re: Pilot light will not stay lit
You can not check a thermocouple by resistence. You have to check it by millivoltage when it is hot and sensing it should be above 500mv. I would be willing to bet that you have some type of particulate in the gas valve that is causing this problem.
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It can take a up to a minute for the thermocouple to get hot enough to latch, the flame is to low, not in the position to hit the thermocouple or just bad. Some valves need to be turned to the ON position after lighting the pilot and waiting for the thermocouple to get hot. Sometimes the nut that holds the tube to the valve comes loose and requires being tightened but not to tight.
From the Owners' manual:
1. Before attempting to light this appliance, the door if so equipped, shall be open.
2. Turn the appliance manual gas shut-off valve to the OFF position.
3. Turn the combination gas control knob to the OFF position.
4. Turn the thermostat control to the OFF position.
5. Wait 5 minutes.
6. Turn the appliance manual gas shut-off valve to the ON position.
7. Turn the combination gas control knob to the PILOT position.
8. Light the pilot with a match while depressing and holding the combination gas control knob until the pilot remains
lit upon releasing the gas control knob.
9. Turn the combination gas control knob to the ON position.
10. Turn the thermostat control knob to the desired temperature to turn burners ON.
11. Ensure that the door is closed during operation.
12. For complete shut-down, repeat steps 2, 3, and 4.
It won't turn any further until the pilot is lit and stays lit.
TO LIGHT THE PILOT
1.Open the door.
2. Turn the thermostat OFF The thermostat is located
behind the door.
3. Push the gas control valve knob and turn to OFF. Wait 5 minutes for unburned gas
4. Push and turn gas control valve knob to the "L" in PILOT.
5. While still holding the knob in, light the pilot with a lit flame. Continue to depress the
knob until pilot remains lit when knob is released. If the pilot does not remain lit,
repeat step 3 through 5.
6. Depress and turn gas control knob to ON
Pilot should hold 30 to 45 seconds after igniting when gas valve knob is released. If there is 500 millivolts across the pilot terminals and still the piolot wont hold, you have to replace the gas valve.
Most fryers have pilot lighting instructions on the inside of the door. If yours doesn't then find the gas valve, turn the knob to the pilot position, push in on the knob and light the pilot. Keep the knob pushed in after you lite the pilot for at least another 30 seconds. The pilot should stay lit.
Assuming that the pilot is lit, when you turn the thermostat from off to the operating temperature, you should hear a click at some point. If you do not, the thermostat is defective. You can also double check this by detaching one of the two wires going to the thermostat and measuring for continuity between the two terminals. At off it should show no continuity. At 200F or above it should show continuity. This is the most common problem.
If the pilot will not stay lit or if it goes out when you increase the thermostat setting, it is usually a defective or weak thermopile (or thermocouple), or a defective gas valve. If replacing the gas valve, I recommend replacing the thermocouple or thermopile at the same time.
Restate your problem if the pilot won't stay lit or if it goes out when you turn the thermostat up.
there is a small adjustment screw on the gas valve,turn it clockwise to increase pilot,if that does not work the vent cap on the gas regulator on the back of the unit could be stopped up,remove that cap ,clean out or replace unit can operate without it just fine.If you increase the pilot and it still wont stay lit replace the thermocouple
Ensure that gas is getting to the pilot , or you may have a devective pressure regulator. If gas is getting to pilot and pilot is turning off, then you need to replace the thermocouple. The thermocouple function is to turn off the gas if there is not enough temperature, so to prevent gas leaks if the pilot light goes off. Near to the pilot light there
should a part similar to a small metal tube directly in contact with the flame. Thermocouple is wired back to the gas valve. When the pilot is on, and temperature is steady, the thermocouple will generate a small voltage that will keep the
gas safety valve open. In case the pilot light goes off, the thermocouple will cause the valve to close. When you hold the pilot light button , the thermocouple will normally reach enough temp to keep valve open. If the termocouple is faulty, it will turn off as soon as you release the igniter button. Replacing thermocouple is an easy repair.
Call the number listed on the owners documentation to get the replacement part.