Chamberlain JDC Manual page 56

Troubleshooting (continued)
Display
Code Description
Message
F51 F51 INP1 Unmonitored
F52 BLOCK eye/edge
F52 INP1 device
F53 CMND triggered for
F54
3 minutes
F53 INP2 or more on
F55 BLOCK input 1/2/3/4,
F56 F54 INP2 or blocked
CMND when door
F57 motion was
F58 F55 INP3 requested
BLOCK
F56 INP3
CMND
F57 INP4
BLOCK
F58 INP4
CMND
Possible
Diagnosis
Causes
Obstruction Check for obstructions
in doorway
is blocking
unmonitored
eye/edge
device
Improperly Check system settings
configured item in the menu to check
input the device type setting for
the input
Incompatible INP1/2/3/4 inputs are
device is compatible with dry-
being used contact type devices.
Ensure the device being
used is a dry-contact type
device.
Wiring fault to Check wiring for short or
device open circuit
Ensure wires are wired into
correct terminals
Damaged Swap device with known-
device good device
Damaged Disconnect unmonitored
powerhead eye/edge. Open circuit
main board condition is equivalent to an
unobstructed unmonitored
eye/edge device.
56
Resolution
If obstructions are present, remove
the obstruction
Ensure the device type matches the
device that is actually installed
If the device is incompatible, replace
with one that is, or move the device
to another input which is compatible
with the device
Correct wiring faults
If a known-good device works,
replace the faulty device
If the main board still detects
an obstruction with no device
connected, power cycle the
operator.
If the problem persists, reset to
factory defaults and configure
again.
If problem still persists, replace the
powerhead main board.