Despatch LBB 1-23 Owner's Manual

Contents

Despatch LBB 1-23 Owner's Manual Manual pdf 55 page image

LBB Series Oven Owner’s Manual MAINTENANCEVersion 20 557. TroubleshootingTable 7. Common Technical Issues and Remedies.Technical Issue Probably Cause Suggested Remedy/Next StepFailure to heat oronly heats up to30–50 °CNo power Check power source and/or oven and wall fuses.Burned out heater(s) Replace element (see Warranty statement,Section 8).Control InstrumentmalfunctionCheck control parameters. Replace controller ifOUT LED on controller does not turn on. Seesection 7.1 and 7.2Loose wireconnectionsDisconnect power and check connections behindcontrol panel.Slow heat upImproperly loadedworkloadReduce load or redistribute load in chamber.Low line voltage Supply sufficient power and proper connections.Check for circuit overload.1 or 2 heatingelements burned outCheck heater amperage on the nameplate.Replace burned out element (see Warrantystatement, Section 8).Vent is wide open. Close vent.Fan motor failure Replace fan motor.Frequent heaterelement burnoutHarmful fumesgenerated by load Increase vent opening or discontinue process.Spillage or splatteringof material on heaterelementsDisconnect power and clean oven chamber andelements.Overheating oven Check the Control and High Limit instruments.Fan motor failure Replace fan motor.ErratictemperatureControl instrumentmalfunctionCheck control parameters before replacing theControl instrument.InaccuratetemperatureControl instrumentmiscalibrationCheck control parameters. Recalibrate Controlinstrument.Excess surfaceor doortemperatureDoor seal deterioration Replace door seal.Door closed into top orbottom latch only See specific difficulty below for this problem.Improper airflowFan motor failure Replace fan motor.Unbalanced fan wheel Reposition fan wheel within 3/10” from top ofhousing. Replace fan wheel.ExcessivevibrationDirty fan wheel Clean fan.Unbalanced fan wheel Replace fan wheel.Grinding noise Fan wheel has shiftedor fallen.Inspect the wheel. Reposition fan wheel within0.25” from top of housing.