Troubleshooting Honeywell S8600

ELECTRICAL (ELECTRONIC IGNITION IID)

WARNING HIGH VOLTAGE

For qualified Technicians ONLY

NOTE: Some heaters may be equipped with an ignition module that shuts off pilot gas if pilot fails to light. To reset, interrupt power to heater.

START

TURN GAS SUPPLY OFF.

TURN THERMOSTAT

(CONTROLLER) TO CALL

FOR HEAT

POWER TO MODULE

(24 V NOMINAL)

YES

Intermittent Pilot System

NOTE:Before troubleshooting, familiarize yourself with the startup and checkout procedure.

NO	Check line voltage power, low voltage transformer, limit controller, thermostat
	(controller) and wiring.

SPARK ACROSS

IGNITER/SENSOR GAP

YES

Pull ignition lead and check spark at module.

Spark Okay?

YES

•Check ignition cable, ground wiring, ceramic insulator and gap, and correct.

•Check boot of the ignition cable for signs of melting or buckling. Take protective action to shield cable and boot from excessive temperatures.

TURN GAS SUPPLY ON

PILOT BURNER LIGHTS?

YES

SPARK STOPS WHEN

PILOT IS LIT?

YES

MAIN BURNER LIGHTS?

YES

SYSTEM RUNS UNTIL CALL FOR HEAT ENDS?

YES

		• Check that all manual gas valves are open, supply tubing and pressures are good,
NO
NO
		and pilot burner orifice is not blocked.
		and pilot burner orifice is not blocked.

•Check electrical connections between module and pilot operator on gas control.

•Check for 24 Vac across PV-MV/PV terminals on module. If voltage is okay, replace gas control; if not, replace module.

	NOTE:If S8600H goes into lockout, reset system. Lockout is used on L.P.G. models.

	•	Check continuity of ignition cable and ground wire.
NO
NO
	•	Clean flame rod.
	•	Check electrical connections between flame rod and module.
	•	Check for cracked ceramic flame rod insulator.
	•	Check that pilot flame covers flame rod and is steady and blue.
	•	Adjust pilot flame.
	•	If problem persists, replace module.

	•	Check for 24 Vac across MV-MV/PV terminals. If no voltage, replace module.
NO	•	Check electrical connections between module and gas control. If okay, replace
NO	•
		gas valve or gas control operator, i.e. pilot gas valve, flow switch etc.

NOTE: IF S8600H goes into lockout, reset system.

NO	• Check continuity of ignition cable and ground wire.

NOTE: If ground is poor or erratic, shutdowns may occur occasionally even though operation is normal at the time of checkout.

•Check that pilot flame covers flame rod and is steady and blue.

•If checks are okay, replace module.

CALL FOR HEAT ENDS

SYSTEM SHUTS OFF?

YES

TROUBLESHOOTING

ENDS

NO	•	Check for proper thermostat (controller) operation.

	•	Remove MV lead at module; if valve closes, recheck temperature controller and

		wiring; if not, replace gas valve.

Repeat procedure until troublefree operation is obtained.