A Simu remote communicates with the roller shutter motor via radio signal, on a frequency specific to the range (Hz, BHz, or EHz depending on the models). When pressing a button no longer triggers any response from the shutter, the problem lies in one of the three links in this chain: the transmitter, the receiver integrated into the motor, or the motor’s power supply itself.
Before ordering a new remote, a methodical diagnosis often allows for restoring functionality without expense. When dealing with a Simu remote that no longer works, the most common cause remains the simplest to fix.
Radio receiver of the Simu motor: the often-ignored link
Most guides focus on the remote itself. Feedback from professionals points in another direction: in recent installations, failures of the radio receiver module integrated into the motor are on the rise. A worn capacitor or a faulty electronic board on the receiver produces exactly the same symptom as a non-functional remote.
The discriminating test is quick. If the shutter has a wired wall control in addition to the radio remote, operate it. Three scenarios arise:
- The wall control works normally: the motor and its power supply are healthy, the problem comes from the radio transmitter/receiver pair.
- The wall control does not respond either: the failure is on the motor or power supply side, not the remote side.
- The shutter moves intermittently with the wall control: the motor shows signs of fatigue (mechanical or electronic wear), and the remote is probably not at fault.
This test prevents replacing a transmitter when the real fault lies in the receiver or the motor. Professionals now prioritize this diagnosis of the radio receiver before any remote replacement.
Radio disturbances and home automation environment
Simu remotes from the HZ and EHZ ranges operate on radio frequencies shared with other household devices. Zigbee modules, home automation hubs, Wi-Fi repeaters: all these devices emit signals that can interfere with communication between the remote and the motor.
Documented cases show that a Simu radio-controlled shutter becomes functional again after a simple action: temporarily turning off surrounding radio equipment and bringing the remote closer to the motor to within one meter. If the shutter responds under these conditions, the signal was interfered with, not absent.
Installations integrated into home automation systems (TaHoma, Jeedom, Home Assistant) are the most exposed. When the Simu remote coexists with a home automation gateway that also controls the shutter, a command conflict can lock the receiver. The solution involves temporarily disabling home automation control to isolate the problem.
Locating the source of interference
Proceed by elimination. Unplug one radio device at a time, then test the remote after each disconnection. The device whose shutdown restores the shutter’s functionality is your source of disturbance. A simple repositioning of this equipment is sufficient in most cases.
Reprogramming procedure specific to Simu motors
If the diagnosis indicates a loss of synchronization between the remote and the motor, reprogramming is necessary. Since 2023-2024, Simu has released notices warning against a common reflex: applying the power cut sequences designed for Somfy motors on a Simu motor.
This confusion is common because both brands belong to the same group. The double or triple power cut sequences used on Somfy motors can, on a Simu motor, take the motor out of programming mode or disrupt the limit settings. The result is worse than the initial problem: a shutter that no longer stops in the fully open or closed position.
Sequence to reset to programming mode for Simu
The procedure varies depending on the type of motor (wired, radio Hz, radio BHz). The common principle remains as follows:
- Cut the power supply to the affected shutter for a few seconds, then restore it. Observe if the motor emits a brief movement or a beep confirming entry into programming mode.
- Press the programming button on the remote within the time indicated by the Simu notice (varies by model). This time is short: a few seconds after power restoration.
- Validate the pairing by operating an upward or downward movement. If the shutter responds, synchronization is restored.
The official Simu FAQ details the exact sequences for each motor range. Using the procedure for the wrong model remains the primary cause of reprogramming failure.
Replacing the Simu remote: compatibility and verification points
When the remote is physically defective (cracked casing, permanently pressed buttons, oxidized circuit board), replacement becomes necessary. Compatibility is not limited to the Simu brand: the radio frequency and protocol must match exactly those of the installed motor.
Simu Hz transmitters are not interchangeable with BHz or EHz models. The motor reference number, usually found on a label affixed to the winding tube (accessible by opening the shutter’s housing), allows for identifying the correct frequency. Ordering a remote based solely on the brand, without checking the frequency range, is a costly mistake.
Batteries and transmitter autonomy
Simu remotes operate with button batteries or AAA batteries depending on the models. A weak battery does not cause a sudden stop: the signal range gradually decreases. If the remote only works at very short distances from the shutter, replacing the batteries resolves the issue. Also check the metal contacts in the battery compartment, as slight oxidation is enough to break the circuit.
A complete diagnosis of a Simu remote rarely takes more than a few minutes when following a logical order: checking the batteries, testing with the wired wall control, eliminating radio interference, then reprogramming. Each step rules out a possible cause and prevents intervention on the wrong component.