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I have replaced the stack flu sensor several times, I did get the first one to work for a day but now the board isn’t getting a reading and heater shuts down Starts and heats and then shuts down… Reading is always 80. Before I replace the board has anyone discovered another cause? I don’t...

Hi, my heater is firing up, heats for 5 seconds and after several tries it stops and get the 3 blinks indicating “Ignition Lockout” I just replaced the thermal Regulator, Main Control Board, the ignitor, stack flue sensor and manifold bypass...was getting ready to replace ignition module but I...