Q: What is the RF 01921.1 module and how does it work?

The RF 01921.1 module is a radio frequency transmitter that transforms your thermostat into a wireless controller for the 01924 receiver. It replaces the standard relay module of the thermostat and establishes radio communication between your control devices and your receiver. Technical operation Transmission frequency: 433.92 MHz (same as the reception frequency of the 01924 receiver) Range: Several tens of meters indoors, depending on your environment Coded signals: The module sends radio signals to the receiver to trigger the activation of the corresponding channels Installation The 01921.1 module is installed directly in the 01910 or 01911 thermostat to replace the wired relay module. It can be complemented by a remote antenna via coaxial cable if necessary to improve the range. Result: Instead of controlling your blinds or equipment via electrical cables, the RF module allows you to control them remotely via radio waves - this is the heart of the wireless communication of the Vimar system.

Q: The antenna icon is displayed but does not blink on the receiver 01924 — what should I do?

If the antenna icon is displayed but does not blink , it means that the receiver 01924 is currently not in an active reception phase of an RF signal from the thermostat. When should the antenna blink? According to the manual, the antenna icon blinks exclusively during the configuration phase when the thermostat transmits its programming signal to the receiver: If you have a thermostat model 01910 : the transmission lasts 2 minutes If you have a thermostat model 01911 : the transmission lasts 40 seconds After configuration Once this initial phase is completed, the antenna icon remains displayed but stops blinking . This is normal. The icon simply indicates that the RF module 01921.1 is present and active in the receiver. Check that the transmission is working To confirm that the RF communication is established, press the P button on the receiver. The red LEDs should light up: 1 LED = weak reception 2 LEDs = sufficient reception 3 LEDs = good reception 4 LEDs = excellent reception If no LED lights up, the RF signal is not being received and you will need to restart the thermostat configuration procedure.

Q: How many blinds or shutters can the Vimar 01924 receiver control?

The Vimar 01924 is a 4-channel RF receiver capable of controlling 4 independent circuits via its 4 relays 6(2) A 250 V~. This means you can operate up to 4 shutters, blinds, or other devices in parallel. Each channel has a relay with a changeover contact, allowing flexible control of your equipment. The device operates at a frequency of 433.92 MHz and has LED indicators showing the quality of the signal reception (from 1 to 4 LEDs depending on the signal strength). If you need to control a single circuit, note that Vimar also offers the model 01923 , which is a more compact 1-channel receiver.

Question 1

What is the RF 01921.1 module and how does it work?

Accepted Answer

The RF 01921.1 module is a radio frequency transmitter that transforms your thermostat into a wireless controller for the 01924 receiver. It replaces the standard relay module of the thermostat and establishes radio communication between your control devices and your receiver.

Technical operation

Transmission frequency: 433.92 MHz (same as the reception frequency of the 01924 receiver)
Range: Several tens of meters indoors, depending on your environment
Coded signals: The module sends radio signals to the receiver to trigger the activation of the corresponding channels

Installation

The 01921.1 module is installed directly in the 01910 or 01911 thermostat to replace the wired relay module. It can be complemented by a remote antenna via coaxial cable if necessary to improve the range.

Result: Instead of controlling your blinds or equipment via electrical cables, the RF module allows you to control them remotely via radio waves - this is the heart of the wireless communication of the Vimar system.

Question 2

Why are the red LEDs flashing on the 01924 receiver and how can I stop the flashing?

Accepted Answer

If the red LEDs on your Vimar 01924 receiver are flashing, it generally indicates a problem with RF signal reception rather than a fault with the device itself. Here are the most common causes and how to resolve them.

Possible causes

Poorly positioned antenna - The antenna should always be vertical. If you are using a rigid wire of 17 cm, check that it has not tilted horizontally after years of operation.
Metal obstruction - Metal objects near the receiver (reinforcements, grids, radiators) can block the frequency 433.92 MHz.
Loose RF module - The transmission module may have slightly detached due to vibrations or temperature changes.
Disconnection after inactivity - If no valid signal has been received for more than an hour, the receiver automatically disables the channel for safety reasons.

Diagnostic and correction procedure

1. Reposition the antenna:

Ensure that the antenna is strictly vertical
If it is on a rigid wire of 17 cm, straighten it if necessary
Keep it away from any metal obstacles

2. Check the RF module (if applicable):

If your system uses a transmitter module 01921.1, open the case of the cronotermostato 01910
Check that the module is properly seated and has not moved
Close the case

3. Test the reception:

Briefly press the P button on the receiver
Observe the red LEDs (1 to 4 depending on the channels): they should light up, not flash
If at least 2-3 LEDs remain lit (not flashing), the signal is good and the device should operate normally

4. If the problem persists:

Reset the receiver by holding the P button for 5 seconds
Reprogram the channels according to your configuration (01910 or 01911)
Test again with the P button

If the LEDs continue to flash after these steps, there may be persistent RF interference or a hardware fault.

Question 3

The antenna icon is displayed but does not blink on the receiver 01924 — what should I do?

Accepted Answer

If the antenna icon is displayed but does not blink, it means that the receiver 01924 is currently not in an active reception phase of an RF signal from the thermostat.

When should the antenna blink?

According to the manual, the antenna icon blinks exclusively during the configuration phase when the thermostat transmits its programming signal to the receiver:

If you have a thermostat model 01910: the transmission lasts 2 minutes
If you have a thermostat model 01911: the transmission lasts 40 seconds

After configuration

Once this initial phase is completed, the antenna icon remains displayed but stops blinking. This is normal. The icon simply indicates that the RF module 01921.1 is present and active in the receiver.

Check that the transmission is working

To confirm that the RF communication is established, press the P button on the receiver. The red LEDs should light up:

1 LED = weak reception
2 LEDs = sufficient reception
3 LEDs = good reception
4 LEDs = excellent reception

If no LED lights up, the RF signal is not being received and you will need to restart the thermostat configuration procedure.

Question 4

If I reset the receiver 01924, do I need to reprogram all the channels?

Accepted Answer

Yes, if you reset the central unit 01924, you will need to reprogram all the channels.

When you hold the P button for 5 seconds, the receiver clears all memories. You will see all the LEDs (green and red) flashing simultaneously to confirm the reset.

After the reset, the device returns to a blank state. To get it working again, you need to reconfigure each channel (1 to 4) by:

Replacing the thermostat relay module with the RF 01921.1 module.
Selecting the desired channel on the thermostat.
Pressing the P button on the receiver until the green LED flashes.
Waiting for the red LED of the corresponding channel to flash to confirm the programming.

Repeat this procedure for each channel you wish to use. The reset is useful when you need to completely reconfigure the device, but plan for it as it involves total reprogramming.

Question 5

How many blinds or shutters can the Vimar 01924 receiver control?

Accepted Answer

The Vimar 01924 is a 4-channel RF receiver capable of controlling 4 independent circuits via its 4 relays 6(2) A 250 V~. This means you can operate up to 4 shutters, blinds, or other devices in parallel.

Each channel has a relay with a changeover contact, allowing flexible control of your equipment. The device operates at a frequency of 433.92 MHz and has LED indicators showing the quality of the signal reception (from 1 to 4 LEDs depending on the signal strength).

If you need to control a single circuit, note that Vimar also offers the model 01923, which is a more compact 1-channel receiver.

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