Glenn / Jabber
Thanks for the further advice however I have decided to pursue replacement of the flame sensor and limit switch, will let you know if this cures the problem.
Bacardi / Glen
Well I followed your advice at the weekend - I have the original documents and wiring diagram etc so located sensors and limit switches - externally they all look OK as does the cleaned up flame/heat sensor. The furnace still continues to start but not reliably as it will...
I have a York Stellar gas furnace around 16 years old - model P3UCD16N07601A with an annoying starting problem - unfortunately it is intermittent. This is how the scenario usually goes when there is a problem. I call for heat, the system responds exactly as it should; it then runs for around 5...