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Troubleshooting – Despatch RAD1-42-2E with Protocol Plus User Manual

Page 64

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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.