Chamberlain JDC Manual page 51

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 Motor DC resistance
brushes 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
fault terminals 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 Inspect encoder
fault 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 If the operator is new,
not 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
51
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