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The following trouble-shooting guide (TABLE 3) will help you identify the source of the problem given a
particular symptom.
TABLE 3 TROUBLE-SHOOTING GUIDE
SYMPTOM PROBABLE CAUSE SUGGESTED ACTION
Door will not respond
to "open" or "close"
push-button.
Motor has overworked and the
overload thermal protection has
tripped.
Reset the overload protection: press reset button
located on the side of the unit for a single phase
operator. For a three phase operator, thermal
switch is inside the motor, let the motor cool and
restart operator. Is the door unbalanced?
Circuit breaker tripped (if used). Reset circuit breaker.
Fuse is blown.
Replace fuse. If control circuit fuse keeps blowing:
Disconnect all external devices. Leave power
terminals connected. (Remove power to power
terminals). Run the operator artificially by using
jumpers and shorting out the appropriate terminals
as indicated in the Start-Up and Testing Guide.
Then reconnect the various external devices one by
one until you find the one causing the short to
ground.
OR: If you have an ohm-meter, use it to check all
incoming wires for continuity to ground. The meter
should read infinity in all instances. If there is
conduction between any control circuit wire and
ground, this indicates a leak to ground and this is
why the control circuit fuse blows when power is
applied.
In some cases, the trouble is intermittent: i.e. the
fuse only blows at certain times. This problem is
more difficult to detect, but again: disconnect all
wires going to external devices, and run the
operator: if the fuse does not blow, this indicates
that the trouble resides outside the operator.
Transformer defective. Replace.
Defective "stop" push-button. Replace.
Loose connection in one of the
push-buttons.
Verify, tighten or replace.
Defective "open" or "close" push-
button.
Replace.
Door will not respond
to "open" command,
but will respond to
"close" command.
Defective "open" push-button. Replace.
Defective "open" limit switch. Replace
Loose wire on "open" push-
button, "open" limit switch or coil
of open contactor.
Verify, tighten or replace.
Door will not respond
to "close" command,
but will respond to
"open" command.
Defective "close" push-button. Replace.
Defective “close” limit switch .
djust
Loose wire on close push-button,
close limit switch or coil of close
contactor.
Verify, tighten or replace.
Door moves in wrong
direction with a three
phase motor
Incorrect phasing. Interchange any two power leads.
Door closes by itself
and operator does not
shut-off at the end of
closin
travel.
"close" contactor is defective. Verify and replace.
"close" limit switch defective Verify and replace.
Door opens by itself
and operator does not
shut-off at the end of
opening travel.
"open" contactor is defective. Verify and replace.
"open" limit switch is defective. Verify and replace.
Door coasts when
stopped at any
position.
Brake pad is worn out or requires
adjustment.
Replace or adjust.
Sensing edge does
not reverse door.
Pneumatic hose broken,
electrical wiring not connected.
Contact a qualified installer.
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