Description of the NL0241 open position sunroof sensor
The NL0241 ATC Sunroof Rear Sensor Kit is a vital position-detection component within NOVAL’s marine sliding roof systems. Acting as the open-position sentinel, it communicates directly with the control unit NL0129 the precise moment the sunroof panel reaches its maximum travel — a function that is essential for protecting mechanical integrity and ensuring safe, repeatable operation aboard any vessel.
When the roof reaches its fully open position, the NL0241 cuts the motor drive signal, preventing overtravel and eliminating unnecessary mechanical stress on the belt, actuators, and rail components. In demanding offshore environments — where wave action, vibration, and salt exposure are constant — precise end-of-travel detection is not a luxury, but a necessity.
Mounted on the central track adjacent to the roof motor unit, the sensor’s location has been optimised for detection accuracy while maximising its protection from the marine environment. Built from marine-grade materials, the NL0241 is engineered to withstand UV degradation, salt spray, and the mechanical vibrations inherent to nautical use.
The complete kit is delivered ready for installation and includes everything required for a professional-grade fit-out:
- ATC rear position sensor (Ref. AT0778)
- Stainless steel A4 fasteners
- Purpose-built mounting bracket
- Pre-cut marine cable for optimal routing with a waterproof connector
This sensor operates as an integral part of the NOVAL ATC ecosystem, working in coordination with:
- Control unit NL0129 – the central brain of the ATC system
- Close position sensor NL0243 – detecting the fully closed position at the forward end
- Motor kit NL0242 – the drive unit operating the belt transmission
Together, this synchronized architecture guarantees:
- Accurate and repeatable roof positioning on every cycle
- Protection against end-of-travel overrun and structural overload
- Extended service life of belts, rails, and all moving components
- Smooth, noise-free operation – even in rough sea conditions
The NL0241 is factory-calibrated for use across a broad range of premium yacht platforms and is the OEM-specified replacement part for any NOVAL ATC system requiring rear sensor servicing or renewal.
Specifications
- Reference: NL0241
- Function: Roof fully-open position detection for ATC sunroofs (rear sensor)
- Sensor model: AT0778
- Kit contents: (x1) Sensor, (x1) mounting bracket, (x2) A4 stainless steel screws, (x1) pre-cut marine cable with waterproof connector
- Mounting location: Central track, adjacent to the roof motor unit bracket
- Compatible control unit: NL0129
- Complementary sensor: NL0243 (close position = front sensor)
Compatibility
The NL0241 is factory-calibrated for the following NOVAL ATC marine sunroof applications:
- Beneteau – Gran Turismo range with ATC sliding sunroofs
- Beneteau – Flyer 12 (starboard sunroof sensor)
- Jeanneau – Leader range with ATC sliding sunroofs (Leader 40, Leader 46, etc.)
- Jeanneau – Prestige 440S
- Galeon – 435 GTO with integrated ATC electric sunroof
- Sessa – C42 with hardtop electric sliding roof
Installation / Maintenance
Installation
- Cut all electrical power to the roof system before beginning work.
- Identify the mounting location on the central track, adjacent to the motor unit.
- Secure the bracket using the A4 stainless steel screws supplied in the kit.
- Route and connect the pre-cut cable to the control unit NL0129, ensuring no chafing points along the run.
- Perform a full opening cycle to confirm correct end-of-travel detection.
Maintenance
- Inspect biannually for corrosion, cable wear, or connector oxidation.
- Rinse with fresh water after salt spray exposure and dry with a soft cloth.
- Apply dielectric grease to connectors to maintain waterproof integrity.
- When replacing the rear sensor NL0241, always inspect the front close sensor NL0243 simultaneously.
Our review
✔ Pros
- Pinpoint accuracy in roof open-position detection
- Complete plug-and-play marine kit – no additional hardware required
- Corrosion-resistant, UV-stable construction built for the marine environment
✘ Cons
- Exclusively for NOVAL ATC systems – no cross-platform compatibility
- A faulty sensor disables the opening function entirely until replaced
Conclusion
For yacht owners and professional shipyards, the NL0241 ATC Sunroof Rear Sensor Kit is an essential safeguard for your vessel’s sliding roof. Beyond simply detecting position, it preserves your system’s mechanics, enhances onboard comfort, and ensures safety under all sea conditions. Using an original NOVAL sensor guarantees perfect calibration and reliability — an investment in both performance and peace of mind.
Good to Know
- Always use OEM parts for ATC sunroofs – generic sensors risk improper calibration and system faults
- Correct position sensing reduces strain on actuators, belts, and structural components – especially critical in rough seas
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