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Corrective action and system reset are necessary. Form #43155010 FeW)4 29) TROUBLESHOOTING GUIDE OF DIRECT SPARK IGNITION SYSTEM -START- TURN GAS SUPPLY ON. SET THERMOSTAT TO CALL FOR HEAT. Power To Control Module? (25 vac nominal) Yes Ignition Module 30-Second Delay For Prepurge? Yes Spark Across Igniter or Igniter/Sensor Gap? Yes Main Burner Lights? Yes Spark Stops when Burner Is Lit? Yes Call for Heat Ends and System Shuts Off? No ✓ Check line voltage. ✓ Low voltage transformer. ✓ Thermostat and wiring. ✓ Diaphragm air switch. Check fuse and replace if necessary. Replace module if fuse checks okay. ✓ Turn off gas supply. ✓ Pull ignition leads and check spark at ignition stud. Spark Okay? Yes ✓ Check ignition cable, ground wiring, ceramic insulator and gap (3/16”) and correct. ✓ Check boot of the ignition cable for signs of melting or buckling. ✓ Check for 25 vac across valve and valve terminals on ignition module. If no voltage, replace module. ✓ Check electrical connections between ignition module and gas control. If okay, replace gas control._ ! NOTE: If module goes Into lockout, reset system. Check continuity of sensor cable and ground wire. Check that burner flame covers electrode. If checks are okay, replace ignition module. _ ! NOTE: If module goes Into lockout, reset system. Check continuity of sensor cable and ground wire. NOTE: If ground is poor or erratic, shutdowns may occur occasionally even though operation is normal at time of checkout. Check that burner flame covers electrode. NOTE: Temperature above 1000°F (538°C) causes short to ground. If checks are okay, replace ignition module._ ✓ Check for proper temperature controller operation. ✓ Remove valve lead at module. If valve closes, recheck temperature controller and wiring. If not, replace gas control. -END TROUBLESHOOTING-REPEAT PROCEDURE UNTIL TROUBLE-FREE OPERATION IS OBTAINED. -18- Form #43155010 Feb-04 30) MOTOR AND BLOWER WHEEL CHECK If draft inducer motor fails to run: A)Checkpowersupplytojunction box. B) Check for loose or broken motor lead wire. C) Check to see that blower wheel turns freely and is not rubbing housing. Blower wheel may have worked loose from shaft and jammed against housing. D) Check for blower wheel damage; replace if necessary. If no damage, readjust blower wheel on shaft & retlghten set screw. E) If all above does not correct, replace motor. 31) CLEANING AND ANNUAL MAINTENANCE_ This heater must be cleaned and serviced annually before the start of each heating season and at any time excessive accumulation of dust and dirt is observed. Maximum heating efficiency and clean combustion will be maintained by keeping the heater clean. To clean the heater, follow these instructions: 1) Turn off all electrical and gas supply to the heater. 2) Open the control box access panel. 3) Clean the access panel, the inside of the control box, the emitter tube and the reflector panels. (Dirty reflectors will reduce o...

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