Pilot will light, goes out when pilot button let go, replaced the pilot / thermocouple assy, same issue, also cleaned the flame aresstor, same issue ?
This is a GCV-50-101 propane unit.
I started going out for two weeks, but was able to restart, until it wouldn't stay lit all together.
My propane tank has 500 gallions with 80 PSI showing - i also ohmed out the gas valve checking for no open in the 2 leads.
OK- want to advise while I was posting this I removed my thermo, reinstalled, no help then noticed the RED GAS KNOB had a slight crack in it allowing it depressed enough to start the pilot but not far enough to enguage the thermo. removed the knob used small plyers to push down shaft-hold-let up and BAM works fine knobless.
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Re: 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.
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If pilot stay lit, then thermocouple is working. If pilot will light, then you have gas. If pilot goes out when pilot button is released, then thermocouple is next suspect.
Thermocouple tip must sit in pilot flame. The pilot light heat applied to two different metals inside thermocouple causes small current. The current travels back to gas control valve through copper line. If the gas valve receive this current, then a magnetic switch stays open and allows gas into the gas control valve. The magnetic switch is on the end of the red button you push down when lighting pilot. Essentially the red button is an override to the magnetic switch. If the gas control valve does not receive the current, then the magnetic switch does not stay open when you release the red button. When replacing thermocouple, note that it is not screwed very tight into the gas control valve. Finger tight + 1/4 turn. If it is overtightened, then the small thermocouple current shorts out against the gas control body.
sounds like the thermocouple: The thermocouple is a safety device that turns off the gas if there is
no pilot light. If you look closely at the burning pilot light, there
is a small metal tube that sits directly in the flame, with wires that
lead back to the gas valve. The thermocouple generates a small amount
of electrical current when heated by the flame. This current keeps the
gas safety valve open. If the pilot light gets blown out, the current
stops and the gas valve closes. When you light the pilot light, you
hold down the over-ride button for about 30 seconds. This allows the
gas to flow long enough to heat up the thermocouple and generate current
and then you can release the over-ride button and gas will continue to
flow. If the thermocouple is defective, then as soon as you release the
over-ride button, since there is no electrical current, the gas will
stop flowing and the pilot light will go out.
This is a pretty common failure on water heaters and furnaces.
Replacement of the thermocouple is fairly simple if you are the handyman
type. If not, the thermocouple is a cheap part -- about $10 bucks, but
the service call may run you $100 or so. Before you call a serviceman,
get all of the brand and model information from the information plate
on the heater so he can bring the proper replacement part. And sorry for your trouble. hope this helps:)
The pilot light jet may have got a little bit of dirt or grit in it which is preventing it from keeping alight. Try probing the jet with a fine piece of wire to see it the blockage can be dislodged. You may have to unscrew the jet to clear it by blowing air through it. Make sure gas is turned off first before removing any parts.
The pilot light also 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. If, after cleaning, the pilot light keeps going out, it would seem that your thermocouple is faulty and needs to be replaced
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. It seems that your thermocouple is faulty and needs to be replaced if pilot light keeps going out
There is air in the gas line. The best way to get the air out, is with the gas on, loosen the nut that attaches to the gas valve and make sure you can smell a little gas, then reattach the gas line, making sure everything is tight, and then relight the pilot making sure to hold the pilot light button down for at least 1 minute. Please rate
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.
Check to see if the thermocouple tip is in line with the pilots flame, if its not heating the tip then carefully adjust as necessary. If the tip is in the flame and still wont stay lit then the thermocouple is due for a replacement.This task may require that the burner assy. be removed, so as to access the fasteners that attach thermocouple tip, hence disconnecting the gas line that leads to the burner, and must be properly reinstalled and leak tested. This item can be found at most hardware stores and home centers (Home depot/Lowes) be sure to gently remove the old one and take it with you (for comparison) when you are ready to purchase the new part.
Note: As with any repair of this nature, safety must come first, quality gloves and eye protection should be warn. also do not attempt any repair that is outside of your ability and knowledge.
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 !!