Despatch RAD1-42 -2E with Protocol 3 - Manual (Page 29)

RAD1-42-2E Oven Owner’s Manual T ROUBLESHOOTING
Version 1 29
Copyright © 2012 by Despatch Industries.
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7.2. Error Messages and Alarm
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.