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If this is the 3 wire pilot system that has a spark pilot with green, yellow and white...the valve is available. It has been upgraded but operation is identical. And you do not need a new board I am wondering if the tech is up to speed on this type furnace?
are those the wires going to the pilot? Or the gas valve? It sounds like the gas valve wiring you describe. The pilot should have 3 wires as mentioned
are you willing to do a hands on test? Or are you not comfortable with that?
I understand. Here is the summary.
This pilot can be the cause the gas valve does not work, but I will assume he tested it correctly.
The gas valve is available HERE
as well as other places online.
The gas valve can be changed without changing the board. It may be that the tech does not know exactly what the issue is and wants to replace both.
But as far as your question the valve can be changed without changing the board.
Aprox $450 job
thats why I said it is different in appearance, but it still has the exact operation and terminals and is the direct changeout for you valve...the only difference is yours is 5 terminals all in a row