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Re: hot water heater
There is the possibility you don't have the thermocouple set in the right place. The flame has to hit it just right. Does the pilot stay on until you turn the gas valve to on, then shuts off, or does it shut off as soon as you let go off the button?
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sound like pilot lite is not getting thermocouple hot. check that pilot lite flame is extending out to and touching thermocouple. If not, clean out pilot lite orface and pilot lite gas feed pipe all the way back to the main gas valve if necessary. If pilot lite flame is touching thermocouple, then replace thermocouple
You probably have a defective thermocouple. The thermocouple sits in the flame of the pilot, and the heat generates a small electrical current conducted back to the gas valve, keeping the pilot gas line open after you switch it to the "on" position. That's why you have to manually hold the gas valve depressed (on) during lighting in the "pilot" position, allowing the thermocouple time to heat up enough to generate its current. A defective thermocouple will not generate the holding current.
When you light the pilot, are you holding it down for 30-60 seconds. When you release the pilot button, does the pilot flame stay lit? Or does it only go out when you turn the knob to on position. Make sure the pilot flame is heating the end of the thermocouple and that it's a strong blue flame, not a lazy yellow pilot flame. Make sure the tip of the thermocouple is not burn't off, which usually happens with lazy yellow pilot flames. Replace thermocouple is nothing else works.
Sometimes when you turn a gas heater off for some time, if the source tank has been turned off, the line will bleed the propane and the line will contain mostly air. This is especially true if the supply line is long. In order to light the pilot, you will have to hold the pilot lighting button down for a while (a full minute or longer, depending on the size and length of the supply line) before pure propane arrives at the pilot light jet. You should keep a lighted lighter at the jet so that when the gas arrives, the lighter will light it. After the pilot lights, you will have to keep the button pressed long enough for the thermocouple to get hot enough to set the pilot to stay on. When it is hot enough, you should be able to release the pressed lighting button and the pilot should stay on. If it does, you should be able to light the heater. If the pilot jet never lights, gas is not getting to the regulator. If the pilot will not stay lit after a period of time waiting for it to heat the thermocouple, the thermocouple or the regulator may be bad and need replacement. :-)
The thermocouple has gone bad.The thermocouple needs to be directly in the pilot flame.When the thermocouple goes out,the flame most of the time will have burned the thermocouple tip a way.If it was not for this devise,the gas would exscape,and fill the home up.This is a safety feature.
Hi the thermocouple is a long copper wire that goes back to the gas valve from the pilot .
i would clean the flame senser first , then check the pressure switch jump this out , then check the fan control or snap disc jump this out see if it runs if you need A THERMOCOUPLE then honeywell universal will do