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Do you have a strong pilot? is it engulfing only the top 1/3 of the thermocouple?
Is your thermocouple connection at the gas valve dry (no pipe dope)and tight?
You have a terminal block with wires attached in the thermocouple? connected to the thermocouple?
Ok, now we're getting somewhere. It's probably what's connected to the other end of those leads that's the problem. That thermocouple terminal block isn't a likely culprit. Just for testing purposes disconnect those 2 leads and jump those terminals and see if the pilot lights
Is the block removable? if so remove it and connect the thermocouple directly to the gas valve and try lighting it
If it still won't light give me a picture of the gas valve and thermocouple connection
Ok so get rid of it and connect the thermocouple directly
I can see the pic. Not what I expected. So you jumped the 2 terminals that the red leads are connected to and it won't stay lit?
I got nothing else. Maybe one of my colleagues has an idea. I'm going to open this backup to my colleagues so one of them can help. Please don't respond (even to acknowledge this post)until you get a response from us. If you respond first it will only delay your answer.