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Old 08-16-2019, 08:43 PM   #1
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Gas oven

I can light the pilot and it will burn forever. However, the oven will not light off. It appears that the gas valve will not open to light off the oven. Nothing happens when I turn the temp knob up to fire the oven. Any ideas what to check? We used the oven for the first time that it was ever used last year and it worked great. Stovetop works fine. Any ideas?
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Old 08-16-2019, 09:51 PM   #2
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Quote:
Originally Posted by Bahamaniac View Post
I can light the pilot and it will burn forever. However, the oven will not light off. It appears that the gas valve will not open to light off the oven. Nothing happens when I turn the temp knob up to fire the oven. Any ideas what to check? We used the oven for the first time that it was ever used last year and it worked great. Stovetop works fine. Any ideas?
First thought is to check the flame sensor for the oven, both the wiring connections and its position in the pilot flame. If you have electric ignitors for the top burners, and the burners work, then you have DC to the range but maybe not to the oven solenoid, so that could be a bad connection or control board issue as well.
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Old 08-16-2019, 10:00 PM   #3
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Oven uses a thermocouple that has to be heated by the pilot flame so it can generate the signal needed to open gas valve to main burner


Gas control valve is gas valve, thermostat control and thermocouple sensing ALL in one unit


Might be able to replace thermocouple..........Might have to replace the gas control unit
Depends on Make/Model.
What Brand/Model is your Stove/Oven??
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Old 08-16-2019, 10:44 PM   #4
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Old Biscuit has it right. Even though the pilot is lit, if the pilot flame is not impacting on the thermocouple squarely and directly it's not heating it enough to send the signal to the gas valve. There's a couple of ways to address this. Some oven valves have a screw (needle valve) on their body to enable you to adjust the pilot flame. If yours does, this might need to be turned up. Another issue could be that your gas pressure AT THE STOVE may have dropped due to a regulator problem. Have a technician check it, or buy an LP test gauge and do it yourself. A small drop in gas pressure may not be obvious in the stovetop burners, but may still be down enough to give you a problem. Another issue to check is to look closely at where the thermocouple and pilot actually are. They can be knocked out of alignment by any variety of things including storing things in an unused oven. Finally, you could use a BBQ lighter https://www.amazon.com/Refillable-Lo...a-632523026877 and hold it's flame to the thermocouple at the same time as the pilot is on.



These ovens are not rocket science, but everything has to be aligned and within specs to get them working reliably. Good luck.
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Old 08-17-2019, 01:59 AM   #5
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"Bahamaniac"....here is a generic picture of a thermocouple. The smooth tube to the bottom left of the photo, is the part of the thermocouple that should be situated over your pilot light. The pilot heats that end and sends an electrical signal to open the gas valve. Make sure your pilot is hitting the end of the tube. They can be knocked/bumped out of the way.

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Old 08-17-2019, 07:26 AM   #6
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I had an oven in a new TT that would work intermittently. Dealer failed in repairs so I did it. Found there was so much grease in the temperature control valve that the port was being plugged up.
If the other suggestions don't work you might want to check this out.
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Old 08-17-2019, 11:33 AM   #7
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Thank you all for the replies! Now I think I have a plan of attack. I think a shallow drip pan in the oven may have bumped the thermocouple. Hopefully I can fix it today if not tomorrow. I will post results when I can get to it today or tomorrow.
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Old 08-17-2019, 10:05 PM   #8
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After pilot is lit, when you turn up the heat the pilot flame increases to heat that thermocoupler. If it does not do that follow good info above.
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Old 08-18-2019, 06:03 AM   #9
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If the thermocouple is not heated by the pilot flame the pilot will not stay lit. There is a fluid inside the thermocouple that expands when heated to open a port in the gas valve so the pilot will stay lit and allow gas to flow to the burner when the oven control is opened. The gas is then lit by the pilot flame.
Sometimes the fluid leaks out of the thermocouple and then the pilot will not stay lit.
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Old 08-18-2019, 08:07 AM   #10
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The thermocouple is all electrical, it produces a small electrical current when heated which in turn opens the main gas valve. They do occasionally fail, but not often.
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Old 08-19-2019, 06:03 AM   #11
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Some newer thermocouples are electric like the one on my S&B gas water heater.
The one pictured above is a Bourbon (SP) bulb style, it has a gas in it that expands to push the valve open. Usually smells like ether when the tube is broken. Mechanical temperature gauges for vehicles and older industrial equipment also use this system.
I haven't looked at a new rv oven but all of the thermocouples listed on Amazon for an rv oven are of the bulb type.
The size of the bulb can vary from fast like the one posted to slim like the ones on Amazon.
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Old 08-19-2019, 01:45 PM   #12
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Ok, I had a chance to look at the Atwood oven. The thermocouple was properly positioned. I can light the pilot ok. And when I turn up the temperature the pilot increases in size. However the oven will not light off. I am thinking its the thermocouple. Strange though. It's a 1999 but the oven was never lit until I used it for the first time ever last year. It worked flawlessly. Yes I know. A 20 year old unit that had never been used? The rear heater had never been used until I lit it last year also. The pull out sofa had never been used as a bed either. I know the original owner and he confirmed.
Is there any way to test the thermocouple?
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Old 08-19-2019, 11:39 PM   #13
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It's most likely the main valve in the back of the stove. Happened to me.

Suburban Oven no heat
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Old 08-20-2019, 12:40 AM   #14
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OK...it's an Atwood


BUT WHICH MODEL........Atwood/Wedgewood has NUMEROUS models therefore different parts.
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