Maestro Support

This article provides troubleshooting steps for a Lutron Maestro LED+ Dual Dimmer/Switch and Dimmer/Timer (MACL-L3S25 / MACL-L3T251).

This article is expected to take 5 - 10 minutes to complete.

Knowledge Article Contents:

Before You Begin

Swapped Loads

LED Lights Do Not Dim

LEDs Flicker or Buzz When Dimmed

LED Lights Do Not Turn Completely Off

Before You Begin

Confirm the Maestro Dual LED+ Dual Control is installed properly by reviewing the installation resources in the links below. Click on the link below for the device you are troubleshooting:

Dimmer/Switch                                   Dimmer/Timer

Swapped Loads 

If your Maestro LED+ Dual Control is controlling the opposite loads as expected, swap the wires from your electrical box that are connected to the red and yellow wires on the Maestro.

The information below details common issues when dimming LED lights:

LED Lights Do Not Dim

If your LED lights do not dim, or they flash/strobe when dimming them, confirm the LED light that the dimmer is controlling is dimmable.

Not all LED lights are dimmable. Look for wording like “Not for use with a dimmer” or “non-dimmable” on your LED to determine if it is a non-dimmable light. LED dimmers require dimmable bulbs to function properly.  

LED Lights Flicker or Buzz When Dimmed

If your LED lights flicker, buzz, or hum when dimmed, an incompatibility between the dimmer and LED bulb may be causing the issue.

• Test the dimmer with an incandescent bulb or an LED from the Lutron LED Finder Tool. If the issue persists, contact Lutron Technical Support for assistance.
• If the flicker, buzzing, or humming stops when using a different bulb, we recommend replacing the existing LEDs with ones from the Finder Tool.
• If the lights the dimmer controls only flicker near the high or low end of the dimming range, adjust the dimmer’s high-end or low-end trim setting:

Low-End Trim Programming

The low-end trim adjustment increases or decreases the minimum light level of the dimmer. It helps to stop the lights from flickering when the dimmer is set to its lowest brightness. It also can prevent the lights from dropping out (turning off before the dimmer dims all the way down).

Follow the steps below to adjust your Maestro LED+ Dual Control’s low-end trim:

1. Press and hold  and  until a Dimmer Indicator Light (DIL) blinks, then release. The lights will turn off and back on to the low end.
2. Press  or  to adjust the light level until the lights no longer flicker.
3. Tap  to save this setting.
4. Tap  again to turn the lights off.
5. Press  once to turn the lights on to the low end.

If the lights do not turn on, or continue to flicker, repeat these steps until the lights turn on and remain stable.

High-End Trim Programming

The high-end trim adjustment increases or decreases the maximum light level of the dimmer. It is also used to stop the following symptoms of LED incompatibility:

• Lights flicker when the dimmer is at full brightness.
• Lights experience a sudden pop-on when turning on.
• Significant delays when turning on your lights.

Adjusting the high-end trim requires entering Advanced Programming Mode.

Click here to review the Maestro LED+ Dimmer/Switch and Dimmer/Timer Advanced Programming Mode Guide.

LED Lights Do Not Turn Completely Off

If your LED lights are dimly lit when the Maestro dimmer is off, you are experiencing an LED incompatibility called ghosting.

Ghosting will not damage your dimmer or LEDs. It is caused by a small amount of leakage current causing the lights to faintly illuminate.

Swap your LED lights with ones from the Lutron LED Finder Tool to resolve ghosting.