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Troubleshooting (continued)
Display
Code
Message
F11
F11 DOWN
FORCE
Description
Operator detected an
overcurrent condition
moving in the down
direction. Will sense
resistance and reverse
door to open.
Possible Causes Diagnosis
Incorrect door
Wall control displays
speed set. Door
MODE : ----
Speed adjustment
F11 fault
required
Incorrect operator
Verify actual door
for door weight
weight is within
operator rating.
Reference operator
door weight table in
manual
Incorrect Door
Verify correct sprocket
Sprocket
is used. Reference
sprocket table in
manual
Unbalanced Door
Disconnect the door
from operator and
manually check door is
balanced
Pusher Springs
If unit has push springs,
exceed tension
visually inspect push
spring tension in to
door
Door Mechanical
Visually inspect and
Resistance
verify door mechanical
components don't
- Worn Springs,
drag, pull or bind the
Tracks, Rollers,
door
Drums, Edge drag,
CTM, door Panel
bent / damage
Low voltage at L1
Verify voltage at
/ L2
L1 / L2 legs meet
operator current /
voltage specification.
Reference "Electrical
Rating" table
Miller Edge
Remove Miller Edge
installed and
and verify false
takes longer to
positive
react/ respond.
Down Force
triggered before
the Miller Edge
reversal. (Operator
is working
as designed,
condition is on
Miller Edge)
69
Resolution
Change speed in the
System Settings Menu.
OR
Press and hold the Down
& Enter button and release
after display goes blank.
Select System Settings
--> Door Motion --> Door
Speed.
Select desired door speed,
save changes and cycle
door.
Obtain and install correct
operator per door weight
specifications
Obtain and install correct
Sprocket
Properly balance the door
Relearn limits with a max
of 1.5 inches into push
springs
Remove or repair any drag,
pull or binding mechanical
obstruction
If voltage does not meet
specification contact a
licensed electrician
Replace with Liftmaster
edge or keep Miller Edge
with the understanding
that F11 may be a false
positive. And wall control
will only display two
state: Connected or
Missing.
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