Vulcan-Hart SG4D Computer Control Models only Symptom Possible Causes, Symptoms Possible Causes

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TROUBLESHOOTING

	SYMPTOMS	POSSIBLE CAUSES

	Mechanical timer inoperative or not functioning	Interconnecting wiring malfunction.
	Mechanical timer inoperative or not functioning	Line voltage incorrect.
	properly.	Line voltage incorrect.
	properly.	Timer malfunction.
		Timer malfunction.

	Component cooling fan does not run.	Motor inoperable.
	Component cooling fan does not run.	Interconnecting wiring malfunction.
		Interconnecting wiring malfunction.

		Convection fan motor speed/direction.
		Poor combustion.
	Uneven cooking.	Gas pressure incorrect.
	Uneven cooking.	Exhaust vent plugged or obstructed.
		Exhaust vent plugged or obstructed.
		Snorkel vent plugged or obstructed.
		Air flow baffles missing or damaged.

		High ambient temperatures
	Intermittent problems.	Wiring connections loose.
		Cooling fan malfunction.

	No power to temperature controller.	Power/Master switch in OVEN COOL position.
	No power to temperature controller.	Door or door switch open.
		Door or door switch open.

	No heat; LED on the controller is flashing.	Probe open or shorted.

COMPUTER CONTROL MODELS ONLY

	SYMPTOM	POSSIBLE CAUSES

		High limit switch open.
	Oven does not heat.	Probe malfunction.
	Oven does not heat.	Control malfunction.
		Control malfunction.
		Power level control set to off.

	High limit thermostat shutting off gas burner.	Probe malfunction.
	High limit thermostat shutting off gas burner.	Control malfunction.
		Control malfunction.

		Probe malfunction.
	Oven not hot enough.	Control range high (rH1) setting to low. See Setup
		Mode under Computer Controller (SG4C/SG6C).

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Contents SG4 & SG6 Series Full Size GAS Convection Ovens VULCAN-HART Table of Contents Table of Contents General Component Location Removal and Replacement of PartsRight Side Panel Covers and PanelsTop Front Cover Bottom Front CoverSG4D/SG6D SG4C/SG6C Control Panel ComponentsComponent Panel Components SG4C/SG6C Temperature Probe Shown Temperature ProbeGAS Burners GAS Solenoid Valve GAS OrificeSpark Igniter and Flame Sense Ignition Control ModuleBlower and Motor Oven Doors and Bearings Door Catch Roller Assembly Independent Doors Roller Latch Assembly Independent DoorsDoor Window Door Switch High Limit Thermostat Lamp AssemblyInterior Lights Cooling FAN Fan Installation TipsSolid State Temperature Controller Test SG4D/SG6D Service Procedures and AdjustmentsTest Steps Calibration Steps Solid State Temperature Control Calibration SG4D/SG6DTemp F Ohms Temperature Probe Test SG4D/SG6DComputer Controller SG4C/SG6C Operation Setup ModeProbe Test Solid State Relay Test Computer Control Calibration SG4C/SG6CGAS Pressure Adjustment Verification of Spark AT Ignitor Door Switch AdjustmentFlame Current Measurement Blower AdjustmentDoor Strike Adjustment Independent Doors Door AdjustmentDoor Catch Roller Adjustment Component Description Electrical OperationPlug, Socket and Components SG4D/SG6D Front ViewFront View Control Panel Component PanelPlug, Socket and Components SG4C/SG6C Sequence of Operations SG4D/SG6D with Solid State Temperature ControllerCook Cycle Cool Down Cycle Solid State Temperature Controller Timer CycleNormal Cook Cycle SG4C/SG6C with Computer ControllerPage Roast and Hold Cycle Temperature and Time Cycle Normal CookingWiring Diagrams 426574 Rev. C Thermostat SchematicsGAS Convection Oven SG4 with Watlow 734 Control Symptoms Possible Causes TroubleshootingSymptoms Possible Causes Computer Control Models only Symptom Possible CausesError Codes Probable Cause Solution Problem