Despatch LFC2-12-8 User Manual

LAC/LFC Series Oven Owner’s Manual TROUBLESHOOTING
Version 1.12 49
Copyright © 2018 by Despatch Industries.
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7. Troubleshooting
7.1. Troubleshooting Symptoms
Table 2 lists symptoms, probable causes and suggested remedies. Table 3 shows how to
troubleshoot the control panel mounted circuit board.
Table 2. Troubleshooting Oven Symptoms.
Symptom
Possible Cause
Next Step
Failure to
heat or
heats to
only 35-50
degrees C
No power
Check power source and/or oven and wall fuses.
Broken or frayed cord
Replace with new cord.
Burned out heater
Replace heater (see Warranty Section 8.1).
Protocol 3 controller
malfunction
Replace controller.
Loose wire connections
Disconnect power and check connections behind control
panel.
Heater relay failure
Replace circuit board. Or SCR
Airflow switch malfunction
Refer to Section 6.5.1
Door switch failure
Replace door switch.
Slow heat-
up
Improperly loaded
Reduce load or redistribute load in chamber.
Low line voltage
Supply sufficient power and proper connections. Check
for circuit overload.
Heating element(s) are
burned out
Replace burned out element (see Warranty Section
8.1).
240 volt oven is
connected to a 208V line
Raise line voltage to a 240 volt line or modify oven for
208V operation (consult factory).
Fan motor failure
Replace fan motor.
Frequent
heater
element out
Harmful fumes generated
by load
Increase vent opening or discontinue process.
Splattering of material on
heater elements
Disconnect power and clean oven chamber and
elements.
Overheating oven
Check the High Limit.
Fan motor failure
Replace fan motor
Erratic or
inaccurate
temperature
Protocol 3 controller
malfunction
Replace Protocol 3 controller.
Improper tuning
parameters
Check tuning parameters.
Protocol 3 controller
miscalibration
Recalibrate Protocol 3 controller (See Protocol 3
Owner’s Manual, sections on Calibration).
High Limit setting
High Limit should be 10-25°C higher than setpoint.
Improper offset
Check zone calibration.
Excess
surface or
door
temperature
Door seal deterioration
Replace door seal.
Oven Over pressurization
Close fresh air damper or on LFC open exhaust
damper.
Improper
airflow
Fan motor failure
Replace fan motor.
Fan wheel seated too low
on fan shaft
Adjust fan wheel for 3/16" clearance between wheel and
inlet ring.

Despatch LFC2-12-8 Specifications

General

Brand	Despatch
Model	LFC2-12-8
Category	Oven
Language	English