LEGRAND 845 27 - Electrical switch

845 27 - Electrical switch LEGRAND - Free user manual and instructions

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Why does my LEGRAND 845 27 switch operate randomly and not always control the same shutters?
Frequently Asked Questions - 30/12/2025
Response Notice-Facile

A LEGRAND 845 27 switch that operates randomly and does not always control the same shutters may be due to several causes. Here are the points to check and possible solutions:

1. Checking electrical connections

Ensure that all connections of the switch and the roller shutters are tight and free of corrosion. Loose or poorly connected wires can cause erratic operation.

2. Checking the shutter controls

Test each shutter individually to see if it responds correctly to the command. This helps identify if the problem comes from a specific shutter or the switch itself.

3. Electrical or electronic interference

Interference from other electronic devices or nearby electrical installations can disrupt the control signal. Try moving away or temporarily turning off other devices to see if the problem persists.

4. Capacity and load supported

Check that the total load of the controlled shutters does not exceed the maximum capacity supported by the LEGRAND 845 27 switch. An overload can lead to random operation.

5. Resetting the switch

If the switch has a reset function, perform it to return to factory settings. This can correct configuration errors or temporary bugs.

6. Wear or hardware failure

If after all these checks the problem persists, it is possible that the switch is defective or worn. In this case, replacement or technical intervention may be necessary.

By following these steps, you can diagnose and potentially resolve the random operation issue of your LEGRAND 845 27 switch.

Respond (be the first)

Download the instructions for your Electrical switch in PDF format for free! Find your manual 845 27 - LEGRAND and take your electronic device back in hand. On this page are published all the documents necessary for the use of your device. 845 27 by LEGRAND.

USER MANUAL 845 27 LEGRAND

The first time it is switched on, pressing the Up - Stop - Down keys controls all opening points (roller shutters or awnings) in the "In One by Legrand" installation.

Pressing Learn(1) cancels this general control function.

(1) Programming or learn key.

Description

LEGRAND 845 27 - Description - 1

Operation

The general shutter controller Using its Up - Stop - Down keys it can simultaneously control a set of products (actors) that have been associated with it during the learn phase(1). It is then the Leader of the scenario(2).

The general shutter controller is always the central control point (Leader) of a scenario.

It has two auxiliary inputs, E_1 and E_2 , which can be connected to a light sensitive switch, a wind/sun safety control, time switch, etc:

  • The appearance of voltage on E_1 starts the scenario which is recorded on the Up control key.
  • The appearance of voltage on E_2 starts the scenario which is recorded on the Down control key.

Caution :

The Stop control key cannot be accessed from auxiliary inputs E_1 and E_2 .

(1) Learn phase: Operation to associate products so that they can be controlled simultaneously from a central point.
This association is carried out by applying the learn scenario procedure on page 7.
(2) Scenario: Corresponds to the set of products (actors) that are associated with a command key.

Learn scenario

Step 1: Start the learn phase (on the LEADER)

LEGRAND 845 27 - Learn scenario - 1

LEGRAND 845 27 - Learn scenario - 2

LEGRAND 845 27 - Learn scenario - 3

LEGRAND 845 27 - Learn scenario - 4

LEGRAND 845 27 - Learn scenario - 5

Press LEARN

LEGRAND 845 27 - Learn scenario - 6

LEGRAND 845 27 - Learn scenario - 7

LEGRAND 845 27 - Learn scenario - 8

LEGRAND 845 27 - Learn scenario - 9

Press the command key that is to control the scenario

Step 2: Add an actor to the scenario (on the ACTOR)

LEGRAND 845 27 - Learn scenario - 10

LEGRAND 845 27 - Learn scenario - 11

LEGRAND 845 27 - Learn scenario - 12

LEGRAND 845 27 - Learn scenario - 13

LEGRAND 845 27 - Learn scenario - 14

Press LEARN

LEGRAND 845 27 - Learn scenario - 15

LEGRAND 845 27 - Learn scenario - 16

LEGRAND 845 27 - Learn scenario - 17

LEGRAND 845 27 - Learn scenario - 18

Press the command key that is to be associated with the leader

To add a number of products to the scenario, repeat operations 3 and 4 for each actor.

Step 3: Record the scenario (on the LEADER)

LEGRAND 845 27 - Learn scenario - 19

LEGRAND 845 27 - Learn scenario - 20

LEGRAND 845 27 - Learn scenario - 21

LEGRAND 845 27 - Learn scenario - 22

Press LEARN

LEGRAND 845 27 - Learn scenario - 23

The indicator lamps of all the products go off. The scenario is recorded.

Modification of a scenario

Step 1: Open the scenario (on the LEADER)

LEGRAND 845 27 - Modification of a scenario - 1

LEGRAND 845 27 - Modification of a scenario - 2

Press LEARN

LEGRAND 845 27 - Modification of a scenario - 3

LEGRAND 845 27 - Modification of a scenario - 4

LEGRAND 845 27 - Modification of a scenario - 5

LEGRAND 845 27 - Modification of a scenario - 6

Press the command key that controls the scenario

The indicator lamps of all the products in the scenario blink.

Step 2: Modify the state of an actor in the scenario (on the ACTOR)

LEGRAND 845 27 - Modification of a scenario - 7

LEGRAND 845 27 - Modification of a scenario - 8

Press LEARN

To remove the product from the scenario, go to step 3

LEGRAND 845 27 - Modification of a scenario - 9

LEGRAND 845 27 - Modification of a scenario - 10

LEGRAND 845 27 - Modification of a scenario - 11

LEGRAND 845 27 - Modification of a scenario - 12

Press LEARN

LEGRAND 845 27 - Modification of a scenario - 13

LEGRAND 845 27 - Modification of a scenario - 14

LEGRAND 845 27 - Modification of a scenario - 15

LEGRAND 845 27 - Modification of a scenario - 16

Press the command key that is to be associated

Step 3: Record the scenario (on the LEADER)

LEGRAND 845 27 - Modification of a scenario - 17

LEGRAND 845 27 - Modification of a scenario - 18

LEGRAND 845 27 - Modification of a scenario - 19

LEGRAND 845 27 - Modification of a scenario - 20

LEGRAND 845 27 - Modification of a scenario - 21

LEGRAND 845 27 - Modification of a scenario - 22

Press LEARN

The indicator lamps of all the products go off. The scenario is recorded.

Clearing a scenario

Clear all the scenarios linked with the command key (on the LEADER)

LEGRAND 845 27 - Clearing a scenario - 1

LEGRAND 845 27 - Clearing a scenario - 2

Press LEARN

LEGRAND 845 27 - Clearing a scenario - 3

LEGRAND 845 27 - Clearing a scenario - 4

LEGRAND 845 27 - Clearing a scenario - 5

LEGRAND 845 27 - Clearing a scenario - 6

LEGRAND 845 27 - Clearing a scenario - 7

LEGRAND 845 27 - Clearing a scenario - 8

LEGRAND 845 27 - Clearing a scenario - 9

LEGRAND 845 27 - Clearing a scenario - 10

The scenario is cleared

Press the command key and hold it down for 10 s

Clear all the scenarios linked to this product (on the LEADER)

LEGRAND 845 27 - Clearing a scenario - 11

LEGRAND 845 27 - Clearing a scenario - 12

Press LEARN

LEGRAND 845 27 - Clearing a scenario - 13

LEGRAND 845 27 - Clearing a scenario - 14

LEGRAND 845 27 - Clearing a scenario - 15

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LEGRAND 845 27 - Clearing a scenario - 17

LEGRAND 845 27 - Clearing a scenario - 18

LEGRAND 845 27 - Clearing a scenario - 19

LEGRAND 845 27 - Clearing a scenario - 20

Return the product to factory configuration

Press LEARN and hold down for 10 s

Key

LEGRAND 845 27 - Key - 1

The indicator lamp goes off

LEGRAND 845 27 - Key - 2

The indicator lamp blinks slowly

LEGRAND 845 27 - Key - 3

The indicator lamp blinks quickly

LEGRAND 845 27 - Key - 4

The indicator lamp flashes

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Product information

Brand : LEGRAND

Model : 845 27

Category : Electrical switch