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Old 12-13-2015, 04:34 PM   #1
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Propane stove won't stay lit

My propane stove on my 2009 Ford RB50 van won't stay lit. The two-burner has no problem lighting when I press the control knob in and let flame remain on after igniting but as soon as I release the control knob, the flame goes out. It worked fine for a few years. One side seemed to have issues and now both burners are having this issue. Propane tank is full. Any thoughts?
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Old 12-13-2015, 05:16 PM   #2
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dirty thermocoupler
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Old 12-13-2015, 10:05 PM   #3
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That does sound like a thermocouple issue. I don't think all RV stoves have a thermocouple, but maybe yours does. How it works is that the flame heats up the thermocouple, and then it stays open and you have gas flow and flame. If the flame blows out, the thermocouple cools and doesn't allow gas to flow. You can see how this would be a good safety feature. But thermocouples can go bad or not be correctly in the path of the flame and thus not heating up enough.
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Old 12-14-2015, 06:40 AM   #4
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If it has a thermocouple, the flame should be impinging directly on it. Has the thermocouple moved out of place?

I'd ask if you are holding the button in long enough, but you mentioned that it used to work fine......
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Old 12-14-2015, 11:58 AM   #5
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I just thought I'd put a bit more info here. If it doesn't end up helping you, maybe it will help someone searching. At any rate, as already mentioned, the thermocouple (presuming it has one) could be bad. Another thing that can happen is if for some reason the knob is now contacting the surface of the stove (if this can physically happen), then it may not actually be being "held on" for the 20 seconds or so it needs. You can test for this by trying to ignite it with the bare stem (remove the knob). If this is the problem then you can likely modify the knob position slightly to stop it happening.

Here is some info from Force 10 (who make great marine stove/ovens) that might help. I hope it's not too long or "thread clogging." If so I could come back and remove it. This is specific to Force 10 but I think it gives a reasonable overview as well. This presumes a thermocouple equipped stove (not all are in RV's, I don't think).

*****

Remember: The Burner Control Knob must be held all the way in for twenty (20) seconds after ignition in order to heat the thermocouple and allow the gas valve to stay open.

There could be a problem with the thermocouple. The small upright attachment next to the burner on the stove top is one end of the thermocouple. Test operation of thermocouple. A simple way of testing the thermocouple is to ignite the burner with the control knob removed from the valve stem. Using your fingers directly on the valve stem, depress, turn to high, and light the burner. If it stays lit after 20 seconds the thermocouple is working properly. If the burner does not stay lit when using the control knob, it is possible that the knob is contacting the face plate before the valve stem is fully depressed. Remedy this by adjusting the position of the knob on the valve stem.

A thermocouple consists of two dissimilar metals joined together at the sensing end. These metals are in contact with each other only at the point that is exposed to the burner flame. When this point is heated by the burner flame a small amount of electricity is generated. This electric current flows to the other end of the thermocouple that is connected to the gas valve. Here it activates an electromagnet that keeps the valve open. Should the burner accidentally be extinguished electricity will no longer be generated and the valve will be snapped back to the closed position by a stainless steel spring.

If necessary, however, remove the thermocouple following the instructions 1 through 14 below. Lightly sand the end that has been removed from the valve with very fine sandpaper. Replace in the valve and test. If this does not work the thermocouple must have failed and will have to be replaced.
You can also test the thermocouple by removing the end from the valve. Heat up the other end with a torch or another burner on your stove. By using a good quality voltmeter, put one lead on the outside of the thermocouple and the other one on the far cold end. If the thermocouple is okay, it will show a reading on your meter.

If the thermocouple appears to be operating properly after testing, the electromagnet (solenoid) inside the valve which contains a stainless steel spring may be defective and require replacement.

REPLACING THE THERMOCOUPLE Tools Required
- Phillips Screwdriver
- 5/16” (8mm) Open Wrench or Crescent Wrench
- 3/8” (10mm) Open Wrench

General Information
1. Thermocouples are made out of two dissimilar metals. One end of each metal is fastened together. When this connection is heated up, a small amount of electricity is created and can be measured between the other two ends of these wires.
2. Two different styles of thermocouples are used. In one style the outside of the thermocouple is connected to a copper tube, which acts as a conductor. The inside is an insulated nickel wire, which at the other end, is separated from the copper by a very small insulating washer. Using a small brass fitting this end of the thermocouple screws into the gas valve, which contains an electromagnet.
3. In the other style the outside of the thermocouple is connected directly to the metal burner housing which is connected to the metal frame of the appliance that acts as a conductor. The other conductor is an insulated wire. Using a spade type connector this end is connected to the gas valve, which contains an electromagnet.
4. When the thermocouple is heated, the electricity generated attracts the electromagnet in the valve and holds the valve open. If the flame is accidentally extinguished, the thermocouple cools, causing the electromagnet to spring back and close the valve.
5. If the thermocouple is not holding the valve open, check first that it is screwed into the valve tightly enough, as a loose connection will not transfer the voltage. If it has been tightened too much, the insulating washer will be crushed, shorting out the thermocouple. Ideally, the nut should be installed finger tight, plus a 1/4 turn with a wrench.

[Removed a bunch of stuff that was very specific to Force 10 ranges]

Be extremely careful when putting the end of the thermocouple into the valve. If you turn too tightly you will crush the insulating washer and need another new thermocouple. Ideally the nut should be installed finger tight plus a 1/4 turn with a wrench. Do not force or cross thread anything.
10. Make sure all gas lines, spark ignition wires, and thermocouples are not touching anything sharp.
11. When it is all back together, mix some liquid soap and water and do your standard test for leaks with your fuel system pressurized, and all control knobs turned to OFF.
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Old 12-14-2015, 06:03 PM   #6
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Thank you hogasm, Viva and boywonder for the great responses. I will check to see if it looks like a thermocouple is present and also check the control knob placement per your suggestions.
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Old 12-14-2015, 07:32 PM   #7
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If you don't have a thermocouple like mine does not id very well could and be is likely some contamination in your propane that has clogged the jets causing it to weak and go out from not enough pressure. I have spent 30 years cooking over gas stoves at work and have seen this often. There are some special needles that gas fitters use to clean the orifice of the gas jet.
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Old 12-15-2015, 09:06 PM   #8
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Garage
Our stove had tiny spider webs in the gas orifice. They are attracted to the smell.
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