Chamberlain JDC - Page 53

53
Troubleshooting (continued)
Code
Display
Message
Description Possible Causes Diagnosis Resolution
F26 F26 OVER
VOLT
Motor drive
circuitry detected
an overvoltage
condition
AC input voltage
mis-selected
(120V/240V
models only)
Check whether the
transformer connector
is plugged in to the
connectors on the EMI lter
board marked '120V' or
'240V.'
Verify this matches the input
AC voltage supplied to the
operator.
If 240V power is
applied when 120V is
selected, damage to
other components of
the operator electronics
may have occurred.
Ensure voltage selection
is corrected and verify
the operator functions.
Door imbalance
causes motor
regeneration
Inspect door for imbalance
or broken springs
repair or correct
conditions resulting
in excessive door
imbalance
AC power out of
range
Verify input AC voltage:
Measure AC voltage
between 'L1' and 'L2'
terminals at EMI lter
board input connector.
Verify voltage is within
specications.
If voltage is outside
specications, see
resolution.
Ensure the circuit
supplying the operator is
the correct voltage class
for the operator (e.g.
120V, 240V, or 480V)
If voltage is out of
specication for the
circuit, consult an
electrician.
F31
F32
F33
F34
F31 OPEN
HELD
F32 CLOSE
HELD
F33 STOP
HELD
F34 SBC
HELD
Wall control
buttons held/
stuck for at least
1 minute.
Open/Close/
Stop/SBC inputs
triggered for at
least 1 minute.
Wall control
buttons stuck
Check that all buttons return
to the normal state properly
when released.
Repair, clean, or replace
sticking buttons or
controls as necessary.
Wiring short
circuit
Inspect wiring for open/
close/stop/SBC terminals
for short circuits
Correct any wiring faults
found
Faulty accessory
connected to
OPEN/CLOSE/
STOP/SBC
terminals
Disconnect accessories
from the terminals.
If problem is resolved by
disconnection of other
external accessories,
suspect a wiring issue,
faulty accessory, or
incompatible accessory.
Faulty LCD wall
control
Swap wall control with
known-good unit
If known-good wall
control resolves the
issue, fault is with
previous wall control
Faulty powerhead
main board
Remove all accessories
from OPEN/CLOSE/STOP/
SBC terminals. Ensure wall
control is replaced with
a known-good unit for
diagnosis.
Try power cycling the
operator and restoring
factory defaults.
If problems persist,
replace powerhead main
PCBA