Despatch LBB 1-23, Owner'S Manual

Page: 56 / 65

T
ROUBLESHOOTING
LBB Series Oven Owner
’s Manual
56 Version 20
Technical Issue Probably Cause Suggested Remedy/Next Step
Debris has fallen into
fan through shaft
collar. Inspect the wheel for damage. Remove debris.
Oven will not
control at
Setpoint
High Limit instrument
set too low
Set the High Limit higher.
Control instrument
malfunction Check control parameters before replacing
Control instrument.
Air friction of
recirculation fan
Open exhaust air vent. Unit will not control at
minimum operating temperature with vent(s)
closed.
Heater does not
shut down until
temp. reaches
the High Limit
setting
Control instrument
malfunction Verify control parameters. Replace control
instrument if no output exists.
SSR Relay
malfunction
Replace relay if Control output exists.
Door closes into
top or bottom
latch only Uneven latch tension
adjustment Ensure that latch strike is contacting center of
latch. Adjust mounting angle as required. Adjust
door for even top and bottom latch tension by
turning screws on ends of latch. Clockwise
increases tension on latch. Counterclockwise
decreases tension.
Door will not
stay closed Inadequate latch
tension Ensure that latch strike is contacting center of
latch. Adjust mounting angle to center as
required. Increase latch tension by turning
screws on end of latch clockwise. Adjust in even
increments on all four screws to keep door pull
even.
Like any equipment operating over long periods of time, technical issues may arise. Table 7 lists
the common technical issues, their causes and remedies.
7.1. DES2000 Control Parameters Check
a. If oven is not heating, first check the OUT LED. The LED should be ON for the oven to
heat up. If LED is not on or blinking, you will need to verify the parameters.
b. Press key for three (3) seconds.