Despatch LAC2-12-7 - Manual (Page 40)

T ROUBLESHOOTING LAC Series Oven Owner ’s Manual
40 Version 1
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
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retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
7.2. Troubleshooting Error Messages and Alarms
Table 4 lists the more common error messages, possible problems and remedies.
Table 4. Error Messages and Next Steps.
Alarm Status
Possible Problem Next Step
HI LIMIT LED ON 
Problem with thermocouple

High Limit setpoint has
been exceeded.
Once the problem has corrected, press
RESET.
DEV HOLD LED flashing Oven temperature has not
entered (or dropped out of) the
Auto Hold band and the soak
timer has stopped Program a slower ramp rate or if oven
is not heating check heater circuit.
Top PV displays OPEN Control thermocouple is
disconnected or broken Repair or replace the thermocouple.
HLPV displays OPEN High Limit thermocouple is
disconnected or broken Repair or replace the thermocouple.
Danger!
Electrical panels contain high voltage. Turning the power switch
off on the oven does not de-energize the circuit board.
Disconnect and lock out the power supply before working on the
circuit board. Failure to lock out the power supply can result in
death or injury.