• Power not connected to building
• Replace circuit breaker or fuse
• Break in wire

• Push reset button

WARNING: Disconnect power before inspecting any electrical connection. Failure to do so can result in electrocution and death.

• Disconnect power and open control box.
• Tighten all screws on the white and black part of the contact
• Inspect and test all fuses, replace if bad
• Check that there are 24 volts coming out of the secondary side of the transformer

•  Inspect/replace start or run capacitor

• Ensure nothing is making contact with switch
• Replace if bad switch

If Temporary: Generator must be a minimum of 10,000 watts and wire must be sized to provide adequate voltage to control box.

If Permanent: Ensure correct voltage for operator and proper wire size from panel to control box.

• Latch must be fully disengaged
• Latch handle must be making contact with limit switch

• Check that there are 24 volts at the push button
• If not, see if a wire is pinched or cut
• If not, see if there are 24 volts at terminals 1, 2 and 4

• Check wiring in motor

• Check for proper voltage into control box; inadequate voltage can cause motor contacts to chatter

• If the brake vibrates, check solenoid contacts and voltage
• If the sheaves are loose, tighten the cable sheaves on the top operator

• Cable drum not properly aligned
• Cable attached to drum incorrectly
• Door closed on object: open door, remove object and re-align cable
• Less than one wrap on drum: ensure there is more than one wrap around drum when door is closed

• Sheave is out of alignment

• Wrong voltage supply
• Dirty magnet faces — to remove dirt, insert a clean sheet of paper between faces and energize brake while moving paper between faces to dislodge dirt, and then remove paper
• Loose or broken shading coil — replace magnet assembly

• Check wire
• Ensure there’s adequate voltage

• Chain and sprocket out of alignment
• Worn sprocket

• Belt damaged

• Sheave is out of alignment

• Brake is manually released
• Worn friction disc: replace disc if worn to 1/8-inch thickness
• If disc replacement is not required, adjust air gap

• Reset limit switches inside control box. Ensure limit shaft sprocket set screw is tight.

• Improper setting
• Broken or damaged parts

• Verify limit switch is not faulty
• Ensure wires are connected to the correct switch

Bottom roller not turning

• Rubbing against side rail
• Roller bearing bad – replace roller bearing

Cable not feeding properly on top operator

• Cable fell off sheave
• Sheave not turning

Bottom Follower Roller Binding

• Rubbing against i-beam
• Adjust location of travel
• Replace bearing

Cable wrapped up over itself on drum

• Adjust cable so wraps lay flat beside each other when winding

Nylon Strap Loose

• Ensure all straps are tightened similarly

• Increase wire size to operator
• Do not operate door off of generator producing less than 10,000 watts

• Check for correct voltage
• Check for low voltage

• Fill gearbox with oil
• Use synthetic lube rated for appropriate temperatures

• Clear debris from roller path

• Reset bottom limit switch – ensure limit sprocket set screw is tight

• Repair latch cable

• Close other doors and windows

• Realign sheaves and cable

• Ensure door is not closed on object and roller is free of debris

• Repair latch cable

• Tighten turnbuckles on latch cable system
• If unable to seal gap with turnbuckles, the timing will need to be adjusted