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Pilot will not stay on I have replaced thermacoupler and control valve

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The problem may still be in the thermocouple. Not really the thermocouple but the setup.

You can have the wrong thermocouple type. Each type is meant for a different heat range and generates differant output levels.

Loose connections - We are talking about millivolts being generated by the thermocouple in some cases so every little bit can count. Check for cleanliness and secure/good connections.

Thermocouple is in the wrong position. Put it in the wrong spot and it doesn't see enough heat or too much heat.

Needs to be zeroed or calibrated.

Those are the basics to check. If you got replacement parts and they are right then I'd be looking at connections and placement. There is always a slight chance of defective parts but usually the problem comes back to those two things.

Posted on Sep 01, 2010

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You're probably right about the thermocouple, though the size of the pilot flame is also influential, as it generates the electricity to keep the valve open. So you have two options, first I'd try increasing the size of the pilot (there's typically an allen hole for that on the gas valve). If that fails replace the thermocouple. Remove the pilot apparatus, then yank on the thermocouple until it comes out (or bash the top of it), I haven't yet seen one with a locking device. the new thermocouple will slip in right in the same place as the old one. Be sure that the pilot flame will engulf as much of the thermocouple as it can. The new one will also plug in the same way at the gas valve.
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