How to replace Thermocouple

The thermocouple is a probe that sits directly in the flame of the pilot light of your gas fired boiler or furnace or water heater or unit heater. That has a copper wire that goes from the probe to your gas valve. It is important to note: not all gas boilers, furnaces and so on, have a thermocouple or a light able pilot. Some have electronic ignitions and some have spark ignitions. trying to light this type of system can de dangerous and a total waste of time. Lighting a pilot light and or replacing a thermocouple is potentially dangerous. Fire, Explosion, death and destruction of property can result. If you have any doubt in your ability to do this safely stop and call a professional to replace thermocouple. Master Plumber and I are not responsible for any problems you may have as a result of reading this information and using it.
Working on any gas appliance can be dangerous. The few things that I am warning you about may not cover all the possible things that can go wrong. again if you are not 100% sure of your ability CALL A PROFESSIONAL!!! To replace thermocouple

A warning about Propane gas: Propane is heavier then air and can sit on your floor all around your boiler and or furnace or water heater, and can explode when you go to light the pilot light, and if that is not bad enough it can, and does, loose it's odor, making it impossible to detect and an extremely dangerous situation.
Natural gas can build up in a room and can explode. it has lifted houses off of there foundations. I'm not trying to scare you, Gas appliances are perfectly safe under normal operating procedures. The danger comes in when someone who does not know what they are doing messes around with them, changes settings or removes safety items that are required.
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What does it do?

A thermocouple send a low voltage signal to the gas valve, letting the gas valve know there is a flame and it can stay on.
Why do they go out? Nothing lasts forever. after a while a thermocouple is no longer able to send enough voltage to the gas valve to keep the pilot button set. and it needs to be replaced. Some times you can just relight the pilot and it will hold for a few days then go out again. Most of the time this is a week thermocouple.
How to replace thermocouple scroll down for instructions

Pleas use the link below to see the rest of the instructions.

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Troubleshoot your thermocouple.