Troubleshooting – Despatch RAD1-42-2E with Protocol Plus User Manual
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TROUBLESHOOTING
Equipment which operates for long periods 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
or heats up to
only 35-50 C
No power
Burned out heater
Protocol™ malfunction
Loose wire connections
Heater relay failure
Door switch failure
(if installed)
Check power source and/or oven and wall fuses.
Replace heater (see warranty.)
Replace controller.
Disconnect power and check connections behind
control panel.
Replace circuit board.
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 Hi-limit.
Erratic temp. or
inaccurate temp.
Protocol™ malfunction
Improper tuning parameters
Protocol™ miscalibration
Hi-limit setting
Improper offset
Rep
lace Protocol™.
Check tuning parameters.
Recalibrate Protocol™ (see section on Calibration
mode.)
Hi-limit should be 10-25 C higher than setpoint.
Check zone calibration.
Excess surface
or door temp.
Door seal deterioration
Replace door seal.
Improper airflow
Fan motor failure
Fan wheel seated too low on
fan shaft
Unbalanced fan wheel
Replace fan motor.
Adjust fan wheel for 3/16" clearance between
wheel and inlet ring.
Replace fan wheel.