A Simu roller shutter that no longer responds to its radio transmitter poses a diagnostic problem before it becomes a hardware issue. Most malfunctions attributed to the remote control actually originate elsewhere in the control chain. Identifying the faulty link prevents the unnecessary replacement of a perfectly functional transmitter or the reprogramming of an intact radio code.
Isolate the fault with a second Simu control device
The first action is to test the shutter with another control device: wall transmitter, wired push button, key switch, or a second radio transmitter paired with the same motor. This test immediately distinguishes between two distinct situations.
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If no control device makes the motor react, the remote control is not the issue. The fault lies upstream: power cut at the circuit breaker, faulty radio card in the receiver, or mechanically jammed motor. Check for voltage on the circuit dedicated to the shutter.
If the shutter responds to another control, the fault is indeed localized to the transmitter. We then proceed to checks specific to the remote control: battery, contacts, radio coding. When the Simu roller shutter remote control no longer works after this test, the diagnosis is confirmed and the next steps target only the transmitter.
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Simu motor reset: clear the memory before reprogramming
A symptom that consumer guides rarely describe: the shutter executes a brief movement or makes repeated back-and-forth motions without completing its travel. This behavior indicates a radio memory saturation in the receiver, not a battery defect.
The reset procedure involves cutting power at the dedicated circuit breaker. We recommend maintaining this cut for several minutes to allow the internal capacitors of the motor to discharge. A cut that is too brief does not reset the memory of the receiver.
After restoring power, the motor should be in a clean state, ready to accept a new pairing. It is at this stage that the programming sequence of the Simu transmitter makes sense, not before.
Simu Hz transmitter programming sequence
On Simu Hz transmitters (proprietary frequency), the pairing procedure differs from Somfy RTS or io protocols. Press the PROG button on the transmitter for a few seconds until a brief movement of the shutter is observed (up-down or down-up). This movement confirms that the motor’s receiver has accepted the new transmitter into its memory.
- Cut power at the circuit breaker and wait several minutes before any manipulation
- Restore power, then press the PROG button on the transmitter until the confirmation movement of the shutter
- Immediately check the up, down, and stop buttons to validate full functionality
- If the shutter does not respond to the PROG button, check that the transmitter is on the same channel as the targeted motor
A often overlooked point: each channel of the transmitter controls a distinct motor. Pressing PROG while the transmitter is set to the wrong channel pairs a shutter that is not the intended one, and potentially desynchronizes another.
Oxidized contacts and hardware failure of the Simu transmitter
When the battery is new and programming fails, the problem is hardware-related. The battery contacts of Simu remote controls, like most home automation radio transmitters, oxidize over time. A cleaning with isopropyl alcohol on the contact blades is usually sufficient to restore the connection.
A transmitter that produces no radio signal cannot be repaired by reprogramming. To check the emission, a universal radio receiver or a simple portable frequency tester can confirm whether the transmitter is still emitting. Without this equipment, the replacement test remains the most reliable method: borrow a compatible Simu Hz transmitter and attempt pairing.
Compatibility between Simu transmitters and Somfy motors
Simu and Somfy motors belong to the same industrial group, but their radio protocols are not interchangeable in all cases. A Simu Hz transmitter will not control a Somfy RTS motor, and vice versa. Recent motors using the io-homecontrol protocol offer cross-compatibility, provided that both the motor and the transmitter are io certified.
Before purchasing a replacement transmitter, we recommend noting the exact reference of the motor (visible on the label at the top of the motor or in the shutter’s box) and checking the radio protocol: Hz, BHz, or io-homecontrol. Ordering a transmitter on the wrong protocol is a common and costly mistake.
Setting end limits after re-pairing
After a complete reset and a new pairing, the high and low end limits of the shutter are often lost. The shutter may then exceed its closed position or not fully rise.
The adjustment is made via the transmitter by holding down the up or down button, then validating each end limit point according to the procedure specific to the motor model. On Simu motors with electronic adjustment, the movement must be initiated button by button to fine-tune the position to the centimeter.
- High end limit: initiate the upward movement, stop manually at the desired position, validate with the PROG button or the specific button combination for the model
- Low end limit: same procedure in the downward direction, ensuring that the curtain reaches the sensing bar or threshold without forcing
- Check the “My” position (favorite intermediate point) if the motor supports it, by pressing stop at the desired height and then saving
A shutter that forces at the end limit damages the motor and the curtain. Taking the time for this adjustment after each reset protects the installation in the long term.
Replacing a Simu transmitter does not always justify the intervention of a professional. However, if the motor does not respond to any command after checking the power supply and resetting, the radio card integrated into the motor is likely faulty. In this case, replacing the entire motor is often more economical than repairing the electronic card alone.