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The pilot won’t stay lit on my furnace, when I release the button it just goes out. This started occurring after I did some gas plumbing and had to relight the pilot. I suspected the thermocouple and replaced it, but this didn’t fix the problem. I’ve used this furnace for over 15 years without replacing the thermocouple. Can someone recommend the next best course of action to keep my pilot lit?

Some things to note:

• The new thermocouple is a cheap “universal” thermocouple that I purchased from Amazon and it doesn’t seem to sit in place tight but I don’t think it’s moving.
• There seems to be a secondary thermocouple-type wire running alongside the thermocouple and pilot gas line, though I ensured the thermocouple is not in contact with anything else.
• While holding the pilot light button down I get a blue flame with a yellow tip that’s over an inch in length. I’ve held the button down for over the recommended 60 seconds.
• The thermocouple is below the pilot light, but the flame is definitely touching it.
• The furnace is definitely over 30 years old and was likely installed in the 60’s.