Hi Chase,Originally Posted by chaseale
I had a similar issue with my gas-fired Ajax boiler, also using a Honeywell controller (S8610M Continuous Retry). My boiler would send a charge down the electronic ignition line and it would spark in front of the pilot. The pilot would light but the flame sensor on the pilot light was acting like it wasn't communicating with the Honeywell controller, not telling it that we did in fact have flame. Therefore, the main gas valve would not open and the burner bed would not light. After A LOT of troubleshooting, the solution was to replace the Honeywell controller (pretty simple install). If this is the original controller from 94, I would not be surprised that it has died.
Are your gas solenoids getting wet? Some of these units will shut down if they get moist.
Does your system have a flame sensor on it? It usually is right at the pilot light. Try activating the ignition sequence and manually lighting the flame sensor. See if you can "hot wire" the burner to light. If so, I would think the issue lies in the sensor or the controller.
Luck to ya'.