LiftMaster MAXUM JDC Manuel D'installation page 59

Troubleshooting (continued)
Display
Code
Message
F04 F04
UNAUTH.
STOP
(end)
F08 F08 NO
CONFIG
F14 F14 SET
LIMITS
Description
No motor motion was
detected when the
operator was attempting
to move the motor.
Configuration was not
found or was reset to
factory setting
End positions are not
set or stored
Possible Causes Diagnosis
Worn motor brushes Motor DC resistance
should be less than 3
ohms. If it is greater
than 3 ohms, the
brushes may fail to
maintain contact
with the commutator
internal to the motor.
Powerhead main Measure DC voltage
board motor drive across motor terminals
fault at main board. In idle
state, voltage should
be 0.
Activate door operator
with open/close.
Voltage may vary over
a wide range, from
several volts up to
about 40 volts DC.
Encoder wiring fault Inspect encoder cable
for disconnection, bad
connection, cut cable,
etc.
Encoder fault or Go to limit learn
encoder interface process. Number
fault 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 finished.
Motor drive fault Check for other fault
occurred codes
New operator is not If the operator is new,
configured. the configuration is
initially unset.
Operator was If the operator is
factory reset from factory reset, the
the menu configuration will be
unset.
Limits were never New product as
set out of box shipped does not
have any limits set
Settings were F14 error
reset or invalidated
from the menu
59
Resolution
Replace motor
Replace motor brushes
(extended duty models
only)
If voltage is absent during
activation, check for other
fault codes and correct as
necessary. If no other fault
codes are present, power
cycle the operator and try
again.
If fault persists, reset
settings to factory defaults
and reconfigure the
operators.
If fault still persists,
replace main board.
Correct any issues found
with encoder wiring
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.
Review other fault codes
and perform problem
resolution as necessary.
Configure the operator per
the normal process.
Configure the operator per
the normal process.
Learn door limits
Re-learn door limits