Vulcan-Hart SG4D service manual Troubleshooting, Symptoms Possible Causes

Page 42

TROUBLESHOOTING

SYMPTOMS

POSSIBLE CAUSES

 

 

 

Line voltage.

Blower motor doesn't run in OVEN COOL or

Power/Master switch malfunction.

ON position.

Fan switch malfunction.

 

Interconnection wiring malfunction.

 

 

Blower motor doesn't run in the ON position.

Door switch malfunction.

Power/Master switch contacts inoperative.

Cool Down functions OK.

Interconnecting wiring malfunction.

 

 

 

Blower motor doesn't run in OVEN COOL

Power/Master switch malfunction.

position. Runs OK in ON position.

Interconnection wiring malfunction.

 

 

 

Shorted electrode on igniter/flame sense.

 

Igniter cable (high voltage) OPEN.

Gas does not ignite.

Heat relay malfunction.

Centrifugal switch in blower motor inoperative.

No spark.

Transformer inoperative.

No Ignition light is not ON.

High limit thermostat open.

 

 

Interconnecting wiring malfunction.

 

Ignition module malfunction.

 

 

 

Gas solenoid valve off or inoperative.

 

Manual gas valve closed.

Sparks but gas does not ignite.

Gas supply OFF or insufficient gas pressure.

 

Inerconnecting wiring malfunction.

 

Igniton module malfunction.

 

 

 

Igniter lead connections malfunction.

 

Igniter ground inoperative.

Gas ignites but will not maintain flame.

Igniter/flame sense malfunction or maladjusted.

Insufficient gas pressure.

 

 

Snorkel vent plugged, obstructed or missing.

 

Incorrect polarity from transformer to ignition module.

 

 

 

Temperature probe malfunction.

 

Temperature control board malfunction.

Excessive or low heat.

Gas pressure insufficient.

 

Gas orifice plugged or obstructed.

 

Power level may be set to low.

 

 

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Contents SG4 & SG6 Series Full Size GAS Convection Ovens VULCAN-HART Table of Contents Table of Contents General Removal and Replacement of Parts Component LocationBottom Front Cover Covers and PanelsTop Front Cover Right Side PanelControl Panel Components SG4D/SG6D SG4C/SG6CComponent Panel Components Temperature Probe SG4C/SG6C Temperature Probe ShownGAS Burners GAS Orifice GAS Solenoid ValveIgnition Control Module Spark Igniter and Flame SenseBlower and Motor Oven Doors and Bearings Roller Latch Assembly Independent Doors Door Catch Roller Assembly Independent DoorsDoor Window Door Switch Lamp Assembly High Limit ThermostatInterior Lights Fan Installation Tips Cooling FANService Procedures and Adjustments Solid State Temperature Controller Test SG4D/SG6DTest Steps Solid State Temperature Control Calibration SG4D/SG6D Calibration StepsTemperature Probe Test SG4D/SG6D Temp F OhmsOperation Setup Mode Computer Controller SG4C/SG6CProbe Test Computer Control Calibration SG4C/SG6C Solid State Relay TestGAS Pressure Adjustment Door Switch Adjustment Verification of Spark AT IgnitorBlower Adjustment Flame Current MeasurementDoor Adjustment Door Strike Adjustment Independent DoorsDoor Catch Roller Adjustment Electrical Operation Component DescriptionFront View Plug, Socket and Components SG4D/SG6DControl Panel Component Panel Front ViewPlug, Socket and Components SG4C/SG6C SG4D/SG6D with Solid State Temperature Controller Sequence of OperationsCook Cycle Timer Cycle Cool Down Cycle Solid State Temperature ControllerSG4C/SG6C with Computer Controller Normal Cook CyclePage Temperature and Time Cycle Normal Cooking Roast and Hold CycleWiring Diagrams 426574 Rev. C Schematics ThermostatGAS Convection Oven SG4 with Watlow 734 Control Troubleshooting Symptoms Possible CausesComputer Control Models only Symptom Possible Causes Symptoms Possible CausesError Codes Probable Cause Solution Problem