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We have a Rayburn 480ag and the pilot light won't stay in.

We've replaced the thermocouple twice just in case the first one was faulty and it fired up first time. The pilot then went out after about 10 minutes and now won't stay in at all. Any suggestions?

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Posted on Jan 02, 2017

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SOURCE: Pilot light won't stay lit

Wrong voltage thermocouple? must have 400mv, residential uses 25-40mv.

Posted on Feb 13, 2008

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SOURCE: pilot light won't stay lit.

most common cause of the described symptom overheating the thermocouple! a thermocouple produces millivolts of electricity based upon a differential of temperature between the tip and the base. If it gets too hot it will not work correctly. If the pilot flame is too large or the main burner flame is contacting the thermocouple or the thermocouple is too cheap or old all can cause this issue.

Posted on Dec 18, 2008

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SOURCE: Rayburn 480 ag, pilot goes out

rayburn nouvelle thermocouple keeps burning out any suggestions

Posted on Mar 15, 2010

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SOURCE: My old Ruudglas Pacemaker's pilot light went out.

ran out of propane..now my ruudglas hot water heater won't light?

valve is open and other appliances work?

Posted on Jul 27, 2010

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SOURCE: pilot light won' stay lit on water heater

Open following link to identify specific gas control anddownload possible service manuals for that specific product.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.htmlIt is possible that air intake is dirty, or combustion partsneed cleaning, or gas control valve is bad, or gas pressure is low.

Posted on May 19, 2012

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1 Answer

My pilot light won't stay light


Most often, this is a faulty thermocouple. Replace it, but first be sure the pilot flame is actually heating the thermocouple. If it is not, it will not stay lit. Sometimes they fall down out of it's holding bracket or just go bad. A lazy yellow pilot flame means the pilot orifice is dirty and needs to be cleaned. If the pilot flame is a string blue color, then replace the thermocouple.

Mar 17, 2015 | Heating & Cooling

1 Answer

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if the pilot flame onto the thermocouple is 2 small [partialy blocked pilot feeder orifice] this will cause your described symptoms also flame 2 far from t/couple ! Tip of flame farthest from pilot burner should touch and slightly overlap tip of thermocouple

Dec 23, 2013 | Heating & Cooling

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I have a Dayton 3E290 wall heater that was installed new 30 years ago. The pilot light started to extinguish a few years ago. Gradually this began to occur more frequently. I've changed the...


The pilot assembly may need cleaned out and the orifice cleaned, also the gas valve may need to be replaced, to check for proper voltage from the thermocouple you need a flame source and it takes a meter that can register DC milliamps, and should be 350 to 750 millivolts. Heat the thermocouple with the pilot or other flame source and check, if OK, gas valve is weak.

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Water heater pilot light will not stay lit. changed the thermocouple, and still won't stay lit.


Hold the pilot button down for a full minute after it lights, then release. If this does not work then the thermocouple is not adjusted where the flame is heating it or you just have a faulty new thermocouple.

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We have installed a gas rayburn 480AG (CF) . We are just using the oven at the moment. The pilot light is lit but will not fire up when we turn the oven on. The burner is in pristine condition having...


You've all missed the plot. The pilot is on - the burner won't ignite. That sounds like the oven thermostat is turned down, or the electricity has been turned off.

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1 Answer

My pilot won't stay on i've tried several times.


Your problem is easy and frequent. The pilot light should heat up the thermouple which in return by the heat will keep the valve on for pilot light first and the burner light.

So either the pilot light is not reaching the thermocouple - this only if someone moves the pilot light

Or the thermocouple became weak and can hold the gas valve open - so replace the thermocouple with new one.

There is a very small possibility that the gas valve is faulty but you should replace the thermocouple in any case which is very cheap first and is the most possible cause.

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1 Answer

Pilot light won't stay lit.


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.

Sep 05, 2009 | Imperial IFS40 Deep Fryer

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Patio Heater pilot lights won't stay lit


crappy pilot flame (not properly heating the thermocouple), bad thermocouple, thermocouple loose where it screws into the pilot safety valve, bad safety valve magnet.

One or more of those is the problem.

Oh...there is also a saftey switch...in case it tips over. It will also cause the pilot to not stay lit (if the switch or wires that go to i are faulty)

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