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Pilot light would work but the main burner would not as the thermocouple proves that there is a pilot light to fire. The main gas valve would not open

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Q: Would a pilot light on a gas furnace still work with a defective thermocouple?
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Why does the pilot light in your furnace go out?

Defective thermocouple or possibly a dirty or clogged pilot orifice.


Where is the thermocople located on the furnace?

At pilot light, pilot light flows around thermocouple.


Would a dirty filter have anything to do with a pilot light going out on a furnace?

Not usually. Probably a bad or dirty thermocouple.


Would you smell gas if your pilot light on furnace is out?

modern heaters have a thermocouple that would shut off gas supply if the pilot goes out.


Hot water heater pilot wont light?

THERMOCOUPLE or defective gas valve


What is the purpose of the thermocouple?

The thermocouple keeps a gas pilot light burning.


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Brake light switch stuck, defective, or out of adjustment.Brake light switch stuck, defective, or out of adjustment.


Home ac heater unit heat wont come on?

Could be lots of things. If you have a standing pilot light, one that stays on all the time, the thermocouple may be bad. A thermocouple is a small rod that sits in the flame of the pilot light. It then runs to the gas valve. This produces a small amount of electricity that keeps the valve open to let the gas in. If the pilot light goes out it shuts the valve so the house doesn't blow up. Easy enough to replace. If the pilot light is still on and the furnace will not light, it has to be the thermocouple. Check fuses at the furnace and in the panel. Newer gas furnaces have a circuit board in them that can go bad. There are a dozen things that could keep it from working, it is just a process of elination.


Why will the gas furnace burner not light up even though the pilot light is on?

1- Defective gas controller2- Thermostat/ aqua stat not calling for heat3- electric shut offTripped or defective safety device, gas valve set on pilot, bad transformer. Don`t kill yourself looking for the aquastat. That is a boiler control and your furnace does not have one.Electic good-- whatelse can I test?


Why would home heater not work?

If it is gas, the most common problem is the thermocouple. This is what keep the gas valve open. It is a small silver looking wire, 1/8 of an inch diameter that runs from the gas valve to the pilot light. The pilot flame should touch the end of the thermocouple. Of course it can be a lot of things. Power, there can be a fuse at the furnace that may have blown. There will be a box with a light switch and a screw in fuse. The switch may have been thrown.


How do you light the pilot on an octopus furnace?

How do I light pilot light on furnace


You replaced the thermocouple in your furnace but the pilot light still goes out when button is released?

The pilot flame has to encompass the top half inch of the thermocouple. A dirty pilot will sometimes point the flame away and therefore not heat the thermocouple enough to hold. Take a small rubber hose about two feet long and point it at the pilot orface and blow through the hose to remove the ash on the pilot surface Now relight and try it out.