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Hi, thanks for your patience,,,,,,,,,,,,,,,when the box calls for more cooling, the thermister located on the fins (right side) sends a signal to the control board, where in turn it goes into the ignition sequence, and lights the burner, please get back to me for clarification if necessary, thanks michael
thank you for responding, and thanks for your understanding, here is a link to the service manual to your refer, please take a look, and let me know if this is indeed your model. thanks for your patience