Despatch RFD Series - Manual (Page 39)

RFD Oven Series Owner’s Manual T ROUBLESHOOTING
Version 1 39
Copyright © 2012 by Despatch Industries.
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Conditions Actions
2. Check motor for proper operation and direction of rotation.
B. Cold by door 1. See A-1.
2. Check door seals.
3. Open optional supply louvers close to door.
C. Positive pressure
in chamber
4. Close fresh air damper.
5. Open exhaust damper.
6. Refer to Damper Control Section 3.2 for more information.
D. Negative pressure
in chamber
1. Close exhaust damper.
2. Open fresh air damper.
3. Open optional supply louvers slightly.
7.3. Troubleshooting: Error Messages and Alarm
Table 5 lists the more common error messages, the possible problems and remedies.
Table 5. 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.