How to fix Chamberlain Gate Opener programming changes that do not effect the gate?
If programming changes aren't affecting the gate, check the save switch on S1-1. If it's in the 'on' position, subsequent changes won't take effect. Switch S1-1 'off' to make changes, then switch it back 'on' to save them.
What to do if my Chamberlain Gate Opener operator fails to run?
Several factors can cause the operator to fail. First, check the green LED (D17) on the control board; if it's off, ensure a stop control is installed across terminals J1-3 & J1-5. Next, inspect the yellow diagnostic LED; six blinks indicate a master/second unit communication failure. For single units, ensure a jumper is across J4 pins 1 & 2; for dual configurations, check the communication wiring. Also, check the red input status LEDs (D11-D31) for active accessories, which may be malfunctioning. Verify proper J4 connector wiring and measure both high and low voltage power. Finally, if no LEDs are illuminated, ensure the J2 connector is making good contact, and if all else fails, replace the control board.
Why does my Chamberlain LiftMaster Professional SW470 Gate Opener motor run but the gate does not move?
If the motor runs, but the gate remains stationary, the most likely cause is a damaged or improperly tensioned belt or drive chain. Inspect the operator's belt or drive chain to ensure it is intact and correctly tensioned.
What to do if my Chamberlain LiftMaster Professional SW470 operator runs slow and/or trips the internal overload?
If the operator runs slowly or trips the overload, check the incoming line voltage at the unit’s on/off switch and the meter base/sub panel. The voltage at the operator should be within 5% of its rating when running. Also, visually inspect the motor for overheating or damage, and replace it if it's humming, grinding, or making excessive noise. Note that repeated motor problems may indicate poor primary power.
What to do if my Chamberlain Gate Opener opens immediately upon power up and does not close?
If the operator opens immediately upon power up and does not close, check the red input status LEDs (D11-D31) for an active or malfunctioning accessory. If any red LEDs are on, check the corresponding input. An installed accessory may be wired incorrectly or malfunctioning. Try removing the accessory and testing the operator.
Why does my Chamberlain LiftMaster Professional SW470 Gate Opener run but then stop and reverse direction?
If the operator runs, stops, and reverses, this can happen because of several reasons. The entrapment force pot may be incorrectly set, so that the gate will run smoothly normally and reverse when encountering an obstruction. Alternatively, the gate may be binding or not running smoothly. Disconnect the gate from the operator and swing the gate open and close by hand at normal operating speed to check for binding. Also, the Hall Effect Sensor might not be aligned correctly, so make sure that the sensor is adjusted so that it is within 20 thousandths of an inch or as close to the magnets located on the gearbox pulley as possible without coming into contact with them or the pulley. Replace the sensor if it is adjusted correctly but continues to fail.
What to do if my Chamberlain Gate Opener master or second operator is not functioning properly?
If the master or second operator isn't functioning correctly, cycle the power to each unit to initiate proper communication, especially if they were previously in stand-alone mode. Also, check the communication wiring for damage, ensuring it's a twisted pair and not run with power wiring to prevent interference. Finally, review the program settings to ensure both the master and second units are programmed correctly.
Why do the relays chatter when my Chamberlain Gate Opener begins to move?
Relay chattering typically indicates low secondary (low voltage) power. Measure the voltage at terminals R1 & R2; it should be within 5% of 24 Vac. If the high voltage power is good but the low voltage power is bad, ensure the circuit breaker isn't tripped and the correct primary tap is used on the transformer. If these are correct, replace the transformer.
Why does my Chamberlain LiftMaster Professional SW470 open photo eye reverses gate closed when activated during opening?
If the open photo eye reverses the gate when activated during opening, it's likely that the open obstruction input is programmed incorrectly. The input may be set to function with gate edges instead of photo eyes. Reprogram the obstruction inputs for correct operation.
Why doesn't my Chamberlain LiftMaster Professional SW470 Gate Opener gate activate the timer to close after the close photo eye is broken?
If the gate doesn't activate the timer to close after the close photo eye is broken, the close obstruction input is probably programmed incorrectly. It may be set to function with gate edges instead of photo eyes. Reprogram the obstruction inputs to match the installed accessories.
General| Brand | Chamberlain |
|---|---|
| Model | LiftMaster Professional SW470 |
| Category | Gate Opener |
| Language | English |
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