Troubleshooting Honeywell S8600, High Voltage

ELECTRICAL (ELECTRONIC IGNITION IID)

Intermittent Pilot System

TROUBLESHOOTING HONEYWELL S8600

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

SPARK ACROSS

IGNITER/SENSOR GAP

YES

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

	NOTE: Before troubleshooting, familiarize yourself with the start-up and checkout
	procedure.

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


	Pull ignition lead and check spark at module.
	Pull ignition lead and check spark at module.
NO
	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.

NO	•	Check that all manual gas valves are open, supply tubing and pressures are good,
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.


NO	•	Check continuity of ignition cable and ground wire.
NO	•	Check continuity of ignition cable and ground wire.
	•	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.
	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 trouble free operation is obtained.

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