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Troubleshooting (continued)
Display
Code
Message
F68
F68 WE
CRITBATT
F89
F89 WC
DISC
Possible
Description
Causes
Wireless edge
The battery
transmitter
in the
has low
wireless edge
battery
transmitter is
low
Indicates wall
Wall control is
control is not
intentionally
detected
disconnected
Wall control is
wired but off or
not functional
Diagnosis
Check battery condition
in wireless edge
transmitter
See resolution
Check wall control for
display backlight, text on
the display, and function
of open/close/stop
buttons
67
Resolution
Replace battery in wireless edge
transmitter.
Liftmaster strongly recommends
using an LCD wall control with
the operator.
If the wall control is intentionally
disconnected, this error can
be cleared by placing a jumper
wire between the WALL CTRL
teminals on the powerhead main
board. If the jumper is removed
and a wall control reconnected,
the system may require a power
cycle to recognize the new wall
control.
If LCD wall control isn't
functioning properly, see
diagnosis for fault 'LCD wall
control is off or not functioning'
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