Despatch LBB2-xxA/B-1 - Manual (Page 55)

LBB Series Oven Owner’s Manual
T ROUBLESHOOTING
Version 15 55
Copyright © 2012 by Despatch Industries.
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Technical Issue Probably Cause Suggested Remedy/Next Step
Grinding noise
Fan wheel has shifted
or fallen.
Inspect the wheel. Reposition fan wheel within
0.25” from top of housing.
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.