Basic Troubleshooting - Chamberlain SL3000U Installation Manual

SYMPTOM POSSIBLE CAUSES
Operator does not run a) No power to control board
and diagnostic display
b) Open fuse
not on.
c) Defective control board
Control board powers a) Reset button is stuck
up, but motor does not
b) Stop button active or jumper not in place for
run.
c) Open or Close input active
d) Entrapment Protection Device active
e) Defective control board
01-37558

BASIC TROUBLESHOOTING

stop circuit
For complete operation and setup information refer to the Operation and Setup Manual
provided with the operator or go to LiftMaster.com for more information.
© 2015, LiftMaster – All Rights Reserved
SOLUTIONS
a) Check AC power
b) Check fuses
c) Replace defective control board
a) Check reset button
b) Check Stop button is not "stuck on", or verify that the stop
button is a normally closed circuit, or put a jumper on the
stop circuit.
c) Check all Open and Close inputs for a "stuck on" input
d) Check all Entrapment Protection Device inputs for a "stuck
on" sensor
e) Replace defective control board
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Elmhurst, Illinois 60126-1196
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