Despatch LAC2-12-6 - Manual (Page 34)

T ROUBLESHOOTING LAC Series Oven Owner ’s Manual
34 Version 106
Copyright © 2011 by Despatch Industries.
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7. Troubleshooting
7.1. Troubleshooting Error Messages and Alarms
Table 3 lists the more common error messages, the possible problems and remedies.
Table 2. Error Messages and Next Steps.
Alarm Status
Possible Problem Next Step
Hi-Limit LED flashing Problem with thermocouple
Hi-limit setpoint has been
exceeded.
Once the problem has corrected,
press Reset.
Soak LED flashing Oven temperature has not
entered (or dropped out of) the
soak band and the soak timer
has stopped Program a slower ramp rate or if
oven is not heating check heater
circuit.
Top LED displays
OPEN and lower LCD
displays CONTROL
SENS ERR Control thermocouple is
disconnected or broken Repair or replace the thermocouple.
Lower LCD displays HI
LIM SENS ERR Hi limit thermocouple is
disconnected or broken Repair or replace the thermocouple.
Lower LCD displays
HIGH LIMIT ALARM Hi limit temperature setpoint
has been exceeded Determine if:
the setting is too close to the
setpoint
the SSR is defective
calibration is incorrect

The lower LCD intermittently display HL Temp. This is not an
error message, but the Hi limit thermocouple temperature
reading.
7.2. Troubleshooting Symptoms
Table 4 lists symptoms, probably causes and suggested remedies.

The circuit board mounted on the control panel has three status
LED indicators to help troubleshoot if the oven is not heating:
 If LED 1 is not lit, check 2F and 3F (control fuses), or power
switch.
 If LED 1 and LED 3 are lit but not LED 2, check high limit
(and optional door switch, if installed).
 If all three LEDs are lit, check 1F and 4F (heater fuses), SSR,
heater, and heater relays.