: Ensure the red button is held down for at least one minute after lighting to engage the thermocouple.
: For digital models, prying the front cover off and removing batteries for 5 minutes often performs a hard reset. Invensys Thermostat Manual Model Fd
: Two side screws allow for manual adjustment of the pilot (P) and bypass (B) functions. Operating & Calibration Instructions : Ensure the red button is held down
Turn the bypass adjustment screw (marked 'B') until the flame is stable across the entire burner. : Calibration is done manually on the face of the unit. Invensys Thermostat Manual Model Fd