In case it helps anyone down the road, check your pilot burner orifice first, to make sure it's clear.
I took apart the entire Honeywell valve setup (controller and valve) and swapped out the thermocouple, and it didn't change anything. Only then did I think to check the pilot burner. The orifice inside it was completely blocked. I cleaned it out, and the problem is solved. On the bright side, I now have backup parts for the entire automated burner set up.
Originally Posted by cdburg
Time to dig up my own ancient post to see if anyone has thoughts on troubleshooting an issue with the Honeywell valve. During my last brew day, I ran into an issue with the valve not lighting the pilot. The auto spark ran, but the valve never seemed to recognize the spark and turn on the gas to the pilot light. I was able to hold a flame from a lighter over the sensor to get the valve to turn on the main gas, so the brew day wasn't lost.
I disconnected and reattached all of the wires on the valve, and it didn't change anything. It doesn't seem to be a loose connection. Any thoughts on troubleshooting the pilot gas supply?