Lennox Equipment not specified Error Code 240

Priority condition: Service Soon This could be either low flame current or a loss of flame while in run mode. • Check micro-amperes of the flame sensor using thermostat or control board. • Clean or replace the flame sensor. • Measure voltage of neutral to ground to ensure good unit ground. • Clean face of burner assembly. • Confirm that the vent termination is properly installed and not recirculating. • Check for loose a wiring connection at gas valve. NOTE: Refer to Service and Application Note H-14-06“ Flame Rectification In All Gas Furnaces” for additional information.