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Posted by Randy Creech on December 16, 2008 at 02:12:17:
old weil-mcclain pd8 failed to fire, i turned gas valve to manual and it lit. turned it back to auto and it stayed lit. about 2 weeks later it did it again and i again turned to manual, but this time when turned back to manual it shut off. Now it will not light in auto. I'm thinking maybe a problem with the thermostat/transformer. how can i troubleshoot?