Despatch LBB2-xxA/B-1 - Manual (Page 54)

M AINTENANCE
LBB Series Oven Owner’s Manual
54 Version 15
Copyright © 2012 by Despatch Industries.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
7. Troubleshooting
Like any equipment operating over long periods of time, technical issues may arise. Table 7 lists
the common technical issues, their causes and remedies.
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.
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.