Owner's manual

MAINTENANCE LBB Series Oven Owner’s Manual
54 Version 18
7. Troubleshooting
Table 7. Common Technical Issues and Remedies.
Technical Issue
Probably Cause
Suggested Remedy/Next Step
Failure to heat or
only heats up to
30–50 °C
No power Check power source and/or oven and wall fuses.
Burned out heater(s) Replace element (see Warranty statement,
Section 8.1).
Control Instrument
malfunction
Check control parameters. Replace controller if
OUT LED on controller does not turn on. See
section 7.1 and 7.2
Loose wire
connections
Disconnect power and check connections behind
control panel.
Slow heat up
Improperly loaded
workload
Reduce load or redistribute load in chamber.
Low line voltage
Supply sufficient power and proper connections.
Check for circuit overload.
1 or 2 heating
elements burned out
Check heater amperage on the nameplate.
Replace burned out element (see Warranty
statement, Section 8.1).
Vent is wide open.
Close vent.
Fan motor failure
Replace fan motor.
Frequent heater
element burnout
Harmful fumes
generated by load
Increase vent opening or discontinue process.
Spillage or splattering
of material on heater
elements
Disconnect power and clean oven chamber and
elements.
Overheating oven Check the Control and High Limit instruments.
Fan motor failure Replace fan motor.
Erratic
temperature
Control instrument
malfunction
Check control parameters before replacing the
Control instrument.
Inaccurate
temperature
Control instrument
miscalibration
Check control parameters. Recalibrate Control
instrument.
Excess surface
or door
temperature
Door seal deterioration Replace door seal.
Door closed into top or
bottom latch only
See specific difficulty below for this problem.
Improper airflow
Fan motor failure Replace fan motor.
Unbalanced fan wheel
Reposition fan wheel within 3/10” from top of
housing. Replace fan wheel.
Excessive
vibration
Dirty fan wheel Clean fan.
Unbalanced fan wheel Replace fan wheel.
Grinding noise
Fan wheel has shifted
or fallen.
Inspect the wheel. Reposition fan wheel within
0.25” from top of housing.