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Troubleshooting Guide
If your gate opener does not function properly after it is installed, use this guide before calling the GTO/
PRO Service Department.
Audible Alarm Indications
Symptom
1) Gives one short beep and no operations when you press the remote.
2) Gives a three second tone, 1 second of silence, and then another three second tone repeatedly.
3) Gives a constant tone.
Diagnosis
1) There is a power problem with the Mighty Mule 500/502, PRO-SW2500/2502, PRO-SW3000/3200 and PRO-
SW4000/4200.
- The battery could have a dead cell in it.
- The battery could be low. Disconnect the transformer or solar panel and check the battery voltage. If the
battery is fully charged, the voltage should be between 12.5 vdc to 13.5 vdc. Any voltage reading below
12vdc is low.
- The battery could be dead or disconnected at battery or board. The transformer or solar panel is powering
the board with the charge voltage. Disconnect the transformer or solar panel to see if the board still
powers up.
- The fuse is blown. Replace the fuse.
2) On the Mighty Mule 500/502, PRO-SW2500/2502, PRO-SW3000/3200 and PRO-SW4000/4200, the board
is giving a limit switch error. Check the connections on the power cable. If this does not work, check the
terminal voltages on the circuit board that is supplied to the limit switch. The voltage across the orange and
green and the brown and green should be 5 vdc without the arm connected. If the board is good, the arm will
need repair.
3) Mighty Mule 500/502, PRO-SW2500/2502, PRO-SW3000/3200 and PRO-SW4000/4200
- The battery could be very low at about 10 vdc. Flip the power switch off and back on to see if it will clear
the alarm. If the alarm is not cleared, check to make sure that there is power at the outlet. There could be
a tripped breaker or GFI. The transformer could be unplugged. The transformer could be blown. If there
is no charge power from the transformer, the green light will be off.
- The board has sensed an obstruction two times in a row. If the alarm clears by switching the power off
and on, the board is sensing an obstruction.
o Something on or about the gate is causing the arm to push too hard to open or close the gate. Look
for something in the path of the gate or something unlevel, out of plumb, or that is binding or
pinching.
o This can be due to a low battery when the unit is charged with a solar panel. Test the charging circuit
and the solar panel in direct sunlight.
o If the alarm will clear by switching the power off and on, the board is sensing an obstruction.
Disconnect the arm from the gate. If it is still obstructing, increase the Stall Force. Max it out if you
have to. However, do not leave the Stall Force at this setting when connected to the gate. If the arm
is in the middle of its cycle, it extends a couple of inches, retracts a couple of inches, and the tube
does not hit the limit switch when retracted, the rev counter in the arm is bad.