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Changed the thermocouple and the waterheater starts up but shuts off a few seconds after

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Iam guessing it is a fairly new hot water heater, when you put in the thermocoupler there should be some sensors there close by look for any carbon build up on them and any were else. if you know were the sensors are at just clean them off if you dont know were there at just do a good cleaning looking for carbon build up uninstall thermocoupler and reinstall and try again. if still not working check correct thermocoupler.

Posted on Aug 26, 2010

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My fireplace doesn't light right away, then it shuts off after a few minutes.


sounds to me like your thermocouple is loose just go to where it connects to the gas valve and tighten it most times this happens after it has been replaced, because temperature changes loosen them also make sure the pilot flame is directly on the thermocouple , sometimes dust gets in to the pilot and changes direction of the flame making it "grade the thermocouple, with the main burner on the air flow sometimes "moves the flame and the thermocouple thinks it went out and shuts down the main burner. extinguish the pilot, either blow it out with canned air, or use a q tip to reach down and dust it out then re light. should be good

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If the pilot go out on a furnace would gas continue to flow to the pilot , or would it shut off with in a few seconds


The pilot flame heats a thermocouple, so if the pilot goes out, the thermocouple cools and shuts off the gas. It can take anywhere from 20 seconds to 2 minutes for it to shut off. You should hear an audible click when it happens.

Sep 14, 2014 | Heating & Cooling

1 Answer

My hot waterheater will light but when i release the reset button after over a minute the pilot light goes out. what do i do


There is a small probe with its tip in the pilot flame called a thermocouple,
this is a flame failure device and shuts off the pilot in the event the flame goes out due to wind water or no gas, this device can become bunrt out usually after many years of use and can normally be replaced, you can purchase a universal thermocouple from most gas appliance retailers

Mar 06, 2011 | Whirlpool Water Heaters

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How to change bad thermocouple on reliance gas hot waterheater reliance 606


it is important to turn off

the gas supply to the water heater at the manual gas shut-off

valve. This valve is typically located beside the water heater.

Note the position of the shut-off valve in the open/on position

then proceed to turn it off.

2. On the lower front of the water heater locate the combination

gas control valve/thermostat. Depress and hold

the lock tab located under the gas control knob on the right.

Rotate the gas control knob on the combination gas control

valve/thermostat clockwise until "OFF" aligns with the mark on

the front of the gas valve. Once the gas supply has been shutoff,

remove outer door. 3. Using a 1/4" nut driver or socket loosen the two screws securing

the manifold door assembly until they are free. Do not

totally remove the screws and plastic retainer washers from

the manifold door. The screws and retainer washers will be

needed to reattach the manifold door. 4. In this step, the thermocouple, manifold tube, pilot tube and

igniter wire will be disconnected from the combination gas

control valve/thermostat. Using a 7/16" wrench

disconnect the thermocouple (left-hand thread) and pilot tube

(right-hand thread). Using a 3/4" wrench disconnect the manifold

tube (right-hand thread). Carefully pull the igniter wire from

the igniter button.

5. Grasp the manifold tube and push down slightly to free the

manifold tube, pilot tube, and thermocouple from the combination

gas control valve/thermostat. when installation is complete and gas is back on, You should be able to relight the pilot and the functionality of your gas hot water heater should be restored.

Nov 27, 2010 | Reliance Natural Gas Water Heater Control

1 Answer

My bosh 2400E LP waterheater fails to ignite often and I have to reset it. At the moment it will not fire up at all. It has run sporatically but not consistantly in the two years it has been installed.


You may very well have a defective thermocoupler. It id the bulb that sits at the tip if the pilot flame. It neeeds th be changed out. Good Luck

Oct 15, 2009 | Water Heaters

2 Answers

Pilot light will not stay lit


your thermocouple needs to be replaced. they are available at any hardware store.

Sep 16, 2009 | Water Heaters

2 Answers

Heater shutting off


this type of heater is very sensitive to the state of the pilot since it uses a Renni type thermocouple to sense a low oxygen situation. Usually the pilot needs to be cleaned. If that does not restore operation only other thing to do is try replacing the thermocouple.
A low pilot will usually hold for a few minutes so I would expect that you have a bad thermocouple.

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Heater goes off


Possibly A bad thermocoupler. It is the part that looks like a stiff solid copper wire with on end sticking in the flame of the pilot light and is a safety feature if the pilot goes out it starts to cool and the resistance changes back you the module and the module shuts the gas off. I have seen these go intermediately faulty in waterheaters and do just what you described.

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