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The heat exchanger looks like it had been spit and polished. There is no vibration on the valve. Do they naturally go bad in 6 months? Can it be replaced with a different valve?

I have a Armstrong Ultra sx80 model #S8400C30919 natural gas furnace. It has the third Honeywell contol valve SV9502H2522 smart valve. Every time that the valve is replaced, it works flawlessly for 6 months. When it does noy work here is the sequence. Thermostat calls for heat, the blower...