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When letting out the button on - on- pilot goes off . What should I replace thermocoupler or the generator?

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Yes the thermocouple is the most likly cause but some times it can be the electromagnet in the gas valve

check if the of thermocople is an uneven thicknees pitted or appears chipped this will confifrm if it needs repacement

also check pilot flame is blue and burning on cleanley on themocouple

Posted on May 15, 2010

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Mine will light, I hold button in for 30 seconds but as soon as I let go it goes out


I'm thinking this question doesn't belong in the category 'Cars and Trucks'!

Your tip is currently published: Edit Tip Tip & How-To about Heating & Cooling

Pilot Light won't stay lit? We get asked this question many times.

If you light your pilot light, hold in the button and then when you release it and the pilot light goes out, generally you need a new thermocouple. Gas repairs can only be undertaken by a qualified gas technician so you can't do this job yourself.

The thermocouple is a safety device that recognises that the pilot has a good flame and is enough to ignite the main burners. The thermocouple opens that valve to the burner.

In limited circumstances the thermocouple doesn't need replacing, either the shield that aims the flame to the thermocouple has become dislodged, or the pilot jet is a little blocked by debris. Either way, having the appliance serviced by a qualified gas fitter is the way to go. I am sure you will have seen news stories about explosions caused by gas leaks and faulty appliances.

Posted by Andrew... on Jan 17, 2016

Dec 13, 2017 | Cars & Trucks

1 Answer

Can't light a vulcan heritage gas heater, the pilot light lights, but as soon as I try to lift my finger off the button to ignite the heater, the pilot flame always goes off.


Hi and welcome to FixYa, I am Kelly.

What you are experiencing is the lack of a signal from the thermocouple to the gas valve. I.e. the thermocouple is not passing heat information at all. This is caused by either a defective thermocouple, a dirty mating area where the thermocouple connects to the gas valve or... an improperly positioned thermocouple that is not "in the flame" with the pilot lit.

  • First make sure the FIRE end of the thermocouple is in the flame when lit. (reposition if necessay)
  • Next disconnect the thermocouple by unscrewing the fitting on the top of the gas valve. (No gas will come out) Clean the metal mating area as best you can and then re-install the thermocouple. Just a good snug fit. Once you feel it come snug add 15 degrees of tightening motion with a wrench.
Attempt to light the pilot... wait 45 seconds to 1 minute while holding the pilot button down before letting it up. If it stays lit.... GOOD JOB. If it goes out the next step is to replace the thermocouple. If after replacing the thermocouple it does not stay lit the remedy is to replace the gas valve. There are no short cuts and the sequence of repairs is just as I stated in order.

You can remove your old thermocouple and walk in to almost any appliance parts supply or Plumbing and heating supply to purchase the correct thermocouple without a part number. They will match it up with yours.

Thanks for choosing FixYa,
Kelly

Feb 20, 2011 | Heating & Cooling

1 Answer

I have ventless natural gas heater , u can lit the pilot , but when u let up off the button the pilot goes out . have replaced thermocouple the same problem pilot will not stay lit. have also used air...


When you light the pilot, hold the button in about 1 minute to satisfy the thermocouple. Once the thermocouple is hot and satisfied, turn the gas to "ON". You may have to extend the time a bit, but 1 minute is usually enough.

Best regards, --W/D--

Jan 20, 2011 | Heating & Cooling

1 Answer

I have a model HE424M 33Mj/h gas Pyrox Firestar gas heater. I have just cleaned it and now it does not start. The pilot light is ok as is the spark but as soon as I let go of the centre button tha whole...


The pilot light has a thermocouple that allows gas to the pilot light while the flame is burning. If flame goes out it shuts gas off to the pilot jet. The thermocouple is bypassed by a switch during the initial ignition and once the thermocouple warms up after a minute or two of holding in the bypass switch, it should maintain the pilot. It seems that your thermocouple is faulty and needs to be replaced if pilot light keeps going out.

Sep 22, 2010 | Heating & Cooling

1 Answer

Pilot will light, goes out when button let go,


A long time ago, in a place far away, I saw an old gas valve, might have been on a water heater, might have been off an A/C unit. I took my 10" adjustable wrench and unscrewed the coil that the thermocouple screws into. Now, when I have the problem that you describe I take the threaded end of the suspected thermocouple and put it into my spare. I light the pilot and hold the button down. Then, after a minute or two, I press the button on my spare, which now has the thermocouple attached. If the spare stays in the "ON" condition, I have just proven my gas valve to have faulted.

I suspect you main gas valve has failed, if you can find another valve, you can test as above, before buying a replacement valve.

Jul 20, 2010 | RTO W4 A.O Smith Gas Hot Water Heater...

1 Answer

I cant get the pilot lit...I turn it to pilot...hold down the button and light the pilot..but when I let it go to turn it to "on" the flame goes out.


Are you holding the button down for a minute or so after you light the pilot before releasing the button?

If so, almost certainly, your thermocouple is bad. This is the long tube which runs from the control box to the pilot flame. Remove this tube, take it to the hardware store and get an exact replacement.

Once the thermocouple is replaced, your pilot light should stay on.

Apr 04, 2010 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

When letting out the button on - on- pilot goes off . what should I replace thermocoupler or the generator?


Hello
The thermocouple feels the heat of the pilot light,through a small copper line running back to the gas valve.

This lets the gas valve open enough to keep the pilot lit.

I would replace the thermocouple,also make sure your holding the dial in the pilot position for at least a minute.

Mar 22, 2010 | Honeywell Heating & Cooling

1 Answer

Pilot will light, but will not switch over to high or low....when you let up on the pilot button the pilot goes out


this heater is similar to a water heater. It has a thermocouple and they go bad. Before you replace it, check to see that the end of the thermocouple is in the pilot flame. If it is, the thermocouple may be bad. this is more likely than the gas valve being bad. they are usually very reliable because of the high liability issues related to them

Dec 20, 2009 | Endless Summer 153100 Open Flame Patio...

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

2 Answers

Pilot light won't stay alight, when i release the knob after lighting, the flame goes out.


hello!! if you changed the thermocouple & the pilot still goes out !! could be a thermostat ( the electromagnet pilot safety ) goes bad !! make sure pilot is clean & should be sharp BLUE pilot !! not yellow & soft !! also hold down the button light the pilot use a digital volt meter set on dc milivolts a brand new thermocouple should test @ 30 milivolts+ - ! & if you have new style water htr with sealed combustion the thermocouple has a safety part of it ! change the thermocouple & make sure your vents for combustion air around the bottom of the water htr has lint & dust built up !!! kiddbrother i work for a gas company doing service !!

Dec 14, 2008 | Rheem 36" Water Heater Thermocouple Kit

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