What to do if programming changes do not affect my Chamberlain Gate Opener?
If programming changes do not affect your Chamberlain gate, check the save switch on switch S1-1. If the switch S1-1 is in the on position any subsequent programming changes will not affect the gate. To make programming changes, switch S1-1 off, make desired changes, and then switch S1-1 on.
Why do the relays chatter when my Chamberlain Gate Opener begins to move?
If the relays chatter when your Chamberlain Gate Opener starts to move, it could be due to low secondary (low voltage) power. Measure the voltage at terminals R1 & R2; it should be within 5% of 24Vac. If the high voltage power is good but the low voltage power is bad, ensure the circuit breaker is not tripped and the correct primary tap is used on the transformer. If the breaker and tap are correct, replace the transformer.
What to do if my Chamberlain LiftMaster Professional SW420 gate does not activate the timer to close after the close photo eye is broken?
If the gate does not activate the timer to close after the close photo eye is broken on your Chamberlain gate opener, the close obstruction input is probably programmed incorrectly. The close obstruction input has been programmed to function with gate edges and not photo eyes.
What to do if my Chamberlain Gate Opener open photo eye reverses the gate closed when activated during opening?
If the open photo eye reverses the gate closed when activated during opening for your Chamberlain gate opener, the open obstruction input is likely programmed incorrectly. The open obstruction input has been programmed to function with gate edges, not photo eyes.
What to do if Chamberlain Gate Opener motor runs but gate does not move?
If the motor of your Chamberlain Gate Opener runs but the gate doesn't move, the belt/drive chain might be damaged or improperly tensioned. Ensure that the operator’s belt/drive chain is intact and tensioned correctly.
Why does my Chamberlain LiftMaster Professional SW420 open immediately upon power up and not close?
If your Chamberlain Gate Opener opens immediately upon power up and does not close, an accessory may be active or malfunctioning. Check the red input status LEDs, D11-D31, for any indication. If any red LEDs are on, inspect the corresponding input. The installed accessory may be incorrectly wired or malfunctioning. To troubleshoot, remove the accessory and test the operator.
What to do if Master or Second Chamberlain LiftMaster Professional SW420 is not functioning properly?
If the master or second operator of your Chamberlain Gate Opener is not functioning correctly, it may be due to a failure to cycle power after setup. The power to each unit must be cycled to initiate proper communication if the operators were previously in stand-alone mode. The communication wiring may be damaged or improperly wired for dual gate operation. Ensure that the communication wire is a twisted pair and is not run in the same conduit with any power wiring to avoid interference. Also, the master or second unit may not be programmed correctly, so review the program settings and check both units for proper programming.
Why does my Chamberlain Gate Opener run slow and/or trip the internal overload?
If your Chamberlain Gate Opener runs slowly or trips the internal overload, it may be due to low primary (high voltage) power. Measure the incoming line voltage at the unit’s on/off switch and the meter base or sub panel, ensuring the voltage at the operator is within 5% of its rating when running. Check the number of amps being drawn from the panel to ensure it doesn't exceed the panel’s rating. Also, verify that the correct wire gauge was used for the distance between the breaker and operator. Inspect the motor for overheating or damage; replace it if it's humming, grinding, or making excessive noise. Note that repeated motor problems indicate poor primary power.
Why does my Chamberlain Gate Opener run, then stop and reverse direction?
If your Chamberlain Gate Opener runs, but then stops and reverses direction, the issue could stem from several causes. The entrapment force pot might be incorrectly set; adjust it so the gate runs smoothly and reverses upon encountering an obstruction. The gate may be binding; disconnect it from the operator and manually swing it open and close to check for smooth movement. If binding occurs, repair the gate. Check red LEDs D29 and D31. The Hall Effect Sensor might be misaligned; adjust it to be within 20 thousandths of an inch of the magnets on the gearbox pulley without contact. If properly adjusted and the issue persists, replace the sensor.
General| Motor Type | DC |
|---|---|
| Max Gate Length | 16 ft |
| Safety Features | Obstruction Detection |
| Remote Control | Yes |
| Battery Backup | Optional |
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