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Gas Furnace – Troubleshooting Spark Ignition Start Inducer Motor Runs? No 24 Volts on “R” Terminal? No 120 Volts to Furnace? No Check: Thermostat, Low Voltage Wiring Yes 24 Volts on “W” Terminal? Yes Yes 120 Volts to Inducer Motor? No Replace: Control Board Yes Replace: Inducer Motor Go To Page - 2 Page 1 No Check: Fuse, Circuit Breaker, Door Switch, Line Voltage Wiring 24 Volts on Both Sides of Pressure Switch? No Is Venting Plugged? No Is Inducer Mtr Port or Hose Plugged? Yes Yes Clear Inducer Mtr Port or Hose Clear Venting Yes Spark Igniter Sparking? No 24 Volts to Spark Module? No Check: Limits and Safeties No Clean Spark Head Yes Is Spark Head Clean? Yes Yes Replace: Spark Module Go To Page - 3 Page 2 No Is Inducer Mtr Pulling Proper Inches W.C.? Yes Replace: Pressure Switch No Replace: Inducer Motor Pilot Ignites? No 24 Volts on PV terminal of Gas Valve? No Replace: Control Board Yes Gas Coming Out of Pilot Port on Gas Valve? Yes No Is Gas Coming Into the Gas Valve? Yes Yes Clear Pilot Tube And Pilot Head Burners Ignite? No 24 Volts on MV terminal of Gas Valve? Replace: Gas Valve No Replace: Control Board Yes Yes Do Burners Stay On? Replace: Gas Valve No Clean/Replace: Flame Sense Device Go To Page - 4 Page 3 No Check: Gas Meter and Gas Shut-off Blower Turns On? No 120 Volts to Blower Motor? No Replace: Control Board or Fan Control Yes Replace: Blower Motor Yes Does House Heat to Set Temperature? No Is It a High Efficiency Furnace? Yes Check: For Plugged Condensation Tube Or Trap Stop No Check: Air Flow, Filter, Dirty A/C Coil, Blocked Return Air Grille, Overheating