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Troubleshooting (continued)
Display
Code
Message
F91
F91
ENCODER
Possible
Description
Causes
The system
Direction
has detected
of rotation
irregularities
incorrect
in the signals
received from
the encoder.
System ID
mismatch
between
powerhead
main board
and operator
chassis can
cause the
encoder to not
be recognized.
Door is drifting
up or down due
to imbalance
when starting
Encoder wiring
fault
Encoder fault
or encoder
interface fault
Diagnosis
Watch operator output
shaft when commanding
operator to open. If
output shaft rotates
in the close direction,
then rotation direction is
incorrect.
Check that the system ID
in the system information
menu matches the model
of the operator
Check for excessive door
imbalance
Inspect encoder cable
for disconnection, bad
connection, cut cable, etc.
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 finished.
68
Resolution
Ensure motor red and black
wires match the labeling on the
powerhead main board near the
motor connector.
Ensure reverse mount setting is
set properly.
Main board system ID
must match the operator.
Replacement service kit main
boards allow setting the system
ID using the menu on the LCD
wall control.
Factory installed boards cannot
have the System ID set manually.
Rebalance door
Correct any issues found with
encoder wiring
If encoder position does not
change with door movement,
ensure system ID in the system
information menu matches the
operator.
If the system ID matches but the
problem persists, the encoder,
encoder wiring, and powerhead
main board are suspect. Check
all three for any visible damage.
Replace or repair suspected
faulty components.
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