49
Troubleshooting (continued)
Symptom Possible Causes Diagnosis Resolution
Door runs slowly/at
half speed
Wall control
disconnected or
damaged
If communications to the wall
control is absent, system will run at
half speed.
LCD Wall control is strongly
recommended to be connected.
If it is desired to run the system
without a wall control, temporarily
or permanently, the system can be
returned to full speed operation by
replacing the wall control wiring with
a jumper wire.
If the wall control is present but not
functioning, see 'LCD wall control is
o or not functioning'
Operator turns o
despite backup
battery being
connected
Dead or worn
batteries
Low battery voltage Allow batteries to recharge
Replace worn out batteries.
Batteries must both be replaced
together. Do not mix old and new
batteries.
Blown battery
fuses on main
board
Visually inspect battery fuses or
check continuity
If fuses are blown, replace both
fuses together
Operator runs
momentarily then
stops in limit learn
mode
Encoder wiring
fault
Inspect encoder cable for
disconnection, bad connection, cut
cable, etc.
Correct any issues found with
encoder wiring
Encoder fault or
encoder interface
fault
Go to limit learn process. Number
displayed while in door limit learn
mode is the encoder position.
Jog door several inches in either
direction and release button.
Number displayed should change.
Make sure to cancel changes or set
limit again when nished.
If encoder position does not change
with door movement, the encoder,
encoder wiring, and powerhead
main board are suspect. Check all
three for any visible damage.
Attempt power cycling and restoring
factory defaults.
Replace or repair suspected faulty
components.
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