Despatch RBC1-50 with Protocol Plus - Manual (Page 37)

33
Troubleshooting
Equipment, which operates for extended lengths
of time, may develop problems. Below are
possible problems and suggested solutions. If
you have a problem not listed and do not know
what to do, contact Despatch Industries at our toll free Help Line 800-473-7373.
Difficulty Probable Cause Suggested Remedy
Failure to heat No power
Burned out heater
Control malfunction
Loose wire connections
Heater relay failure
No power to the heater
Airflow switch open
Door switch failure
(if installed) Check power source and/or oven and wall fuses.
Replace heater (see warranty.)
Replace control.
Disconnect power and check connections behind
control panel.
Replace circuit board.
Reset High limit(s). Make sure control is calling for
heat. Check controller. Check SSR.
Check airflow switch.
Replace door switch.
Slow heat up Improperly loaded
Low line voltage
Heating element(s) are
burned out
Fan motor failure Reduce load or redistribute load in chamber.
Supply sufficient power and proper connections.
Check for circuit overload.
Replace heater (see warranty statement.)
Replace fan motor.
Frequent heater
element burnout Harmful fumes generated by
load
Spillage or splattering of
material on heater elements
Overheating oven Increase vent opening or discontinue process.
Disconnect power and clean oven chamber and
elements.
Check the High limit. Do not operate oven over
260
°
C (500
°
F).
Erratic temp. or
inaccurate temp.
Control malfunction
Improper tuning parameters
High limit setting
Improper offset Replace control.
Check tuning parameters.
High limit should be 10-25
°
C higher than setpoint.
Check zone calibration.
Excess surface
or door temp. Door seal deterioration Replace door seal.
WARNING:
Disconnect the main power switch
or power cord before attempting any
repair or adjustment.