Despatch LEB Series - Manual (Page 40)

32
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
No power Check power source and/or
oven and wall fuses
Burned-out heater(s) Replace element (see
warranty statement)
CONTROL instrument
malfunction Replace controller if OUT
LED on controller does not
turn on.
Failure to heat
Loose wire connections Disconnect power and check
connections behind control
panel.
Improperly loaded workload Reduce load or redistribute
load in chamber.
Low line voltage Supply sufficient power and
proper connections. Check
for circuit overload.
One or two heating
elements burned out Check heater amperage on
the nameplate. Replace
burned out element (see
warranty statement, back
page)
Slow heat up
Vent is wide open Close vent.
Harmful fumes generated by
load Increase vent opening or
discontinue process.
Spillage or splattering of
material on heater elements Disconnect power and clean
oven chamber and
elements.
Frequent heater element
burnout.
Overheating oven Check the CONTROL and
HI-LIMIT instruments.
Erratic temperature CONTROL instrument
malfunction Check control parameters
before replacing the
CONTROL instrument
Inaccurate temperature CONTROL instrument
malfunction Recalibrate CONTROL
instrument
Door seal deterioration Replace door seal. Excess surface or door
temperature
Door closed into top or
bottom latch only See specific difficulty below
for this problem.
HI-LIMIT instrument set too
low Set the HI-LIMIT higher. Oven will not control at
setpoint
CONTROL instrument
malfunction Check control parameters
before replacing CONTROL
instrument.