TROUBLESHOOTING LAC/LFC Series Oven Owner’s Manual
50 Version 1.12
Copyright © 2018 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
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retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
Oven will
not control
at setpoint
Set the High Limit higher.
Protocol 3 controller
malfunction
Check controller settings or replace controller.
Replace SSR and/or check control output voltage.
Air friction of recirculation
fan
Open fresh air or exhaust air vent. Unit will not control
below minimum operating temperature with vent closed.
Heater
does not
shut down
until temp.
reaches the
High Limit
setting
Protocol 3 controller
malfunction
Replace Protocol 3 controller.
Table 3. Troubleshooting with Control Panel Mounted Circuit Board.
Check Fuse Block 2F and 3F (Figure 13)
Check High Limit
Check optional door switch, if appropriate
Check air flow switch on LFC ovens.
Check Fuse Block 1F and 4F (Figure 13)
Check SSR
Check heater
Check heater relays
Danger!
Table 3 lists troubleshooting steps that must be performed by a
qualified electrician or electrical technician trained on electrical
safety and the use of personal protective equipment.
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