MM272 Installation Instructions
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Troubleshooting Guide
If your gate opener does not function properly, use this guide or use the online troubleshooter located at
before calling the NSC Service Department.
VISUAL AND AUDIBLE DIAGNOSTIC INDICATORS
1. Visual Indicators:
a. Power LED (Green):
• ON: AC power or Solar power is present.
• OFF: There is no input power.
2. AUDIBLE INDICATOR (ALARM/BUZZER):
a. Beeps upon power up:
• This is normal self test when the unit is turned on.
b. Continuous beep after power up:
• Check for a stuck button on a transmitter.
c. Continuous alarm after activation or activation attempt:
• Unit has encountered two (2) obstructions without reaching either limit. (Power cycle to reset the alarm)
• Alarm will automatically shut off after 5 minutes; gate will remain disabled until control box is restarted.
d. 1 beep every 20 seconds:
• Low battery is detected.
e. 1 beep every 2 seconds:
• Position sensor on first opener is open circuit. Call NSC Service department.
f. 2 beeps every 2 seconds:
• Position sensor on second opener is short circuit. Call NSC Service department.
g. 1 beep when attempting to activate the opener:
• Blown fuse.
• Battery is extremely low or damaged.
• Loose connection from battery to circuit board.
h. 3 beeps every 2 seconds (first opener):
• Position sensor is short circuit.
• Call Mighty Mule Service department.
i. 4 beeps every 2 seconds (second opener):
• Position sensor is short circuit.
• Call Mighty Mule Service department.
3. IF THE GATE STOPS AND REVERSES DIRECTION
1. Check the position of the mounting brackets and readjust if necessary.
2. Check the gate for binding or hinge damage.
3. Adjust stall force if necessary.
4. Reprogram closed position limits.
