Q: Can the YARDFORCE MB 400 robotic mower be started without installing the boundary wire?

Yes, the robot can start without the boundary wire , but it is essential for its normal operation. Starting the MB 400 without wire: Push the main power button to the ON position to power on the device Press the START button to launch the robot The robot can then move freely and you can test its movements Essential role of the boundary wire: The boundary wire does not control the start, but it is mandatory to define the mowing area. Without it, the robot does not understand where it can mow and may leave your lawn. It must be laid flat, without loops, about 30 cm from obstacles. In summary: You can certainly press the buttons and start the MB 400 to check that it turns on and moves. However, for actual and autonomous use, installing the boundary wire is essential.

Q: How to fully and correctly recharge the YARDFORCE MB 400?

Full charging time: The YARDFORCE MB 400 requires approximately 120 minutes (2 hours) for a full recharge of its 20V lithium-ion battery, starting from an empty battery. Charging procedure: Place the robot on its charging station correctly and stably Ensure that the charging contacts are properly in contact with the terminals of the station The robot will recharge automatically and stop charging when the battery reaches 100% Runtime after full recharge: A fully charged battery provides a runtime of approximately 60 minutes of mowing , depending on conditions (grass height, slope of the terrain, etc.). Tips for optimal battery: Store the robot with the battery fully charged at room temperature (around 20°C) If you store the device for an extended period, recharge the battery every 6 months to avoid complete discharge and maintain its capacity Be aware that each complete discharge cycle slightly reduces the battery capacity The robot will automatically return to its charging station when the battery level becomes low during mowing, so you do not need to manually manage this return.

Q: Why does my YARDFORCE MB 400 stop charging after only 2 minutes and the S1 light blinks on the base?

A charging cycle of only 2 minutes is abnormal. The YARDFORCE MB 400 manual states that a full charge should take about 120 minutes . The blinking of the S1 light during this very short charge usually indicates a defective battery or a poor charging connection. Checks to perform Clean the charging contacts - The manual emphasizes that the charging contacts must remain clean and well-aligned. Carefully wipe the metal contacts of the robot AND the charging base with a dry cloth. Dirt or corrosion interrupts the charge and triggers the S1 alarm. Realign the robot - Ensure that the robot is correctly positioned and properly seated on the base. Poor contact due to misalignment immediately stops the charging. Check the base power supply - Make sure that the power cable of the charging station is properly plugged into a wall outlet and that the cable is not damaged. Wait after turning on - If the battery has been completely discharged for a long time, wait 5 minutes after turning on the robot before placing it back on the base. If the problem persists If the S1 blinking continues and charging still stops after 2 minutes despite cleaning the contacts, the lithium-ion battery is likely defective and needs to be replaced. The manual recommends contacting YARDFORCE support for a warranty replacement, as such a significant charging failure is not a configuration issue.

Q: Why does the CloudHawk app display the message "no signal detected" on my YARDFORCE MB 400 lawn mower?

The message "no signal detected" in the CloudHawk app indicates that the YARDFORCE MB 400 lawn mower cannot communicate properly via Bluetooth or Wi-Fi. Here are the most common causes and how to resolve them: Immediate Checks Bluetooth Distance and Range - Ensure that your phone is within 10 meters of the robot. The Bluetooth range is limited and can be affected by walls or interference. Robot Wi-Fi Button - Press and hold the Wi-Fi button on the MB 400 until the LED indicator blinks. The robot must be in pairing mode to establish the initial connection. App Refresh - Completely close the CloudHawk app and restart it. A simple refresh is not always sufficient. Advanced Troubleshooting Forget Wi-Fi Network - In your phone's settings, forget the Wi-Fi network of the MB 400, then reconnect by entering the password. This forces a new synchronization. Dirty Sensors - The message may also indicate that the detection sensors of the MB 400 are dirty. Clean all boundary sensors with a dry cloth. Full Reset - If the problem persists after 30 seconds, perform a full reset of the robot and reinstall the CloudHawk app on your phone. Contact Support - For technical assistance, contact YARDFORCE France support at 01 84 74 88 28 (Monday-Friday, 10am-12:30pm and 1:30pm-4pm).

Question 1

Is the installation of the CloudHawk app mandatory to use the YARDFORCE MB 400?

Accepted Answer

No, the installation of the CloudHawk app is not mandatory. The YARDFORCE MB 400 robot operates entirely autonomously via its built-in control panel.

Using without the app

You can program and use the MB 400 without Wi-Fi or the app:

Access settings via the robot's physical control panel
Program up to 7 different time slots per week
Set daily start and stop times
Adjust the cutting height (range 20-60 mm)
Fully autonomous operation without reliance on the Internet

When to use the CloudHawk app

The app remains optional and is only useful if you wish to:

Control the robot remotely from your phone
Receive status notifications on your smartphone
Manage programming via the mobile interface

The manual specifies that no mandatory synchronization with a server is required. The choice is yours: simple and autonomous manual programming, or optional advanced control via the app.

Question 2

Can the YARDFORCE MB 400 robotic mower be started without installing the boundary wire?

Accepted Answer

Yes, the robot can start without the boundary wire, but it is essential for its normal operation.

Starting the MB 400 without wire:

Push the main power button to the ON position to power on the device
Press the START button to launch the robot
The robot can then move freely and you can test its movements

Essential role of the boundary wire: The boundary wire does not control the start, but it is mandatory to define the mowing area. Without it, the robot does not understand where it can mow and may leave your lawn. It must be laid flat, without loops, about 30 cm from obstacles.

In summary: You can certainly press the buttons and start the MB 400 to check that it turns on and moves. However, for actual and autonomous use, installing the boundary wire is essential.

Question 3

Why do the blades of the YARDFORCE MB 400 lawn mower stop shortly after starting?

Accepted Answer

If the blades of your YARDFORCE MB 400 stop shortly after starting, several causes may be responsible. Here are the checks to perform:

Priority Checks

Condition of the blades and screws - All three blades must be replaced simultaneously to maintain the balance of the cutting system. Inspect them for any dullness, breakage, or wear. Tighten the blade mounting screws, as loosening can trigger the automatic stop of the system.
Insufficient battery - Check that the 20V Lithium-ion battery is charged to 100%. If it drops below 50%, the robot may automatically stop the cutting motor. Allow it to charge fully (~120 minutes).
Dirty or obstructed sensors - The lift sensors located under the robot trigger an automatic stop if debris obstructs them. Clean the underside of the robot with a dry cloth.
Clogging of the cutting system - Clean the inside of the cutting deck and ensure that no debris is blocking the blades. Clogging can cause them to stop instantly.

Testing Procedure

Before each use, inspect the blades and screws, clean all sensors, then start the robot on flat ground away from grass. If the blades stop again under these conditions, check that the battery is not too low and contact YARDFORCE support.

Question 4

How to fully and correctly recharge the YARDFORCE MB 400?

Accepted Answer

Full charging time: The YARDFORCE MB 400 requires approximately 120 minutes (2 hours) for a full recharge of its 20V lithium-ion battery, starting from an empty battery.

Charging procedure:

Place the robot on its charging station correctly and stably
Ensure that the charging contacts are properly in contact with the terminals of the station
The robot will recharge automatically and stop charging when the battery reaches 100%

Runtime after full recharge: A fully charged battery provides a runtime of approximately 60 minutes of mowing, depending on conditions (grass height, slope of the terrain, etc.).

Tips for optimal battery:

Store the robot with the battery fully charged at room temperature (around 20°C)
If you store the device for an extended period, recharge the battery every 6 months to avoid complete discharge and maintain its capacity
Be aware that each complete discharge cycle slightly reduces the battery capacity

The robot will automatically return to its charging station when the battery level becomes low during mowing, so you do not need to manually manage this return.

Question 5

Why does my YARDFORCE MB 400 stop charging after only 2 minutes and the S1 light blinks on the base?

Accepted Answer

A charging cycle of only 2 minutes is abnormal. The YARDFORCE MB 400 manual states that a full charge should take about 120 minutes. The blinking of the S1 light during this very short charge usually indicates a defective battery or a poor charging connection.

Checks to perform

Clean the charging contacts - The manual emphasizes that the charging contacts must remain clean and well-aligned. Carefully wipe the metal contacts of the robot AND the charging base with a dry cloth. Dirt or corrosion interrupts the charge and triggers the S1 alarm.
Realign the robot - Ensure that the robot is correctly positioned and properly seated on the base. Poor contact due to misalignment immediately stops the charging.
Check the base power supply - Make sure that the power cable of the charging station is properly plugged into a wall outlet and that the cable is not damaged.
Wait after turning on - If the battery has been completely discharged for a long time, wait 5 minutes after turning on the robot before placing it back on the base.

If the problem persists

If the S1 blinking continues and charging still stops after 2 minutes despite cleaning the contacts, the lithium-ion battery is likely defective and needs to be replaced. The manual recommends contacting YARDFORCE support for a warranty replacement, as such a significant charging failure is not a configuration issue.

Question 6

Why does my YARDFORCE MB 400 robotic mower no longer recognize the boundaries?

Accepted Answer

If your MB 400 robotic mower no longer recognizes the boundaries, the problem usually comes from the boundary sensors or the boundary wire. Here are the checks to perform:

1. Clean the sensors

The boundary sensors located on the sides of the robot can easily get dirty with soil and debris. This prevents the detection of the electrical signal from the wire. Clean them regularly with a dry cloth.

2. Inspect the boundary wire

Check that the cable has no visible or invisible breaks. The wire should be laid flat directly on the ground and secured with stakes every 1 to 2 meters. Ensure that it forms a complete closed loop connecting to the charging station.

3. Check the signal continuity

If the robot still does not recognize the boundaries after cleaning and inspecting the wire, the robot's detection system may be faulty and require checking by technical service.

Question 7

Why does the CloudHawk app display the message "no signal detected" on my YARDFORCE MB 400 lawn mower?

Accepted Answer

The message "no signal detected" in the CloudHawk app indicates that the YARDFORCE MB 400 lawn mower cannot communicate properly via Bluetooth or Wi-Fi. Here are the most common causes and how to resolve them:

Immediate Checks

Bluetooth Distance and Range - Ensure that your phone is within 10 meters of the robot. The Bluetooth range is limited and can be affected by walls or interference.
Robot Wi-Fi Button - Press and hold the Wi-Fi button on the MB 400 until the LED indicator blinks. The robot must be in pairing mode to establish the initial connection.
App Refresh - Completely close the CloudHawk app and restart it. A simple refresh is not always sufficient.

Advanced Troubleshooting

Forget Wi-Fi Network - In your phone's settings, forget the Wi-Fi network of the MB 400, then reconnect by entering the password. This forces a new synchronization.
Dirty Sensors - The message may also indicate that the detection sensors of the MB 400 are dirty. Clean all boundary sensors with a dry cloth.
Full Reset - If the problem persists after 30 seconds, perform a full reset of the robot and reinstall the CloudHawk app on your phone.
Contact Support - For technical assistance, contact YARDFORCE France support at 01 84 74 88 28 (Monday-Friday, 10am-12:30pm and 1:30pm-4pm).

Question 8

Why does my YARDFORCE MB 400 robotic mower only mow along the boundary wire?

Accepted Answer

If your YARDFORCE MB 400 robotic mower only mows along the boundary wire without exploring the inside of the area, it generally indicates a malfunction in detection or positioning. Here are the essential checks:

1. Check the installation of the boundary wire

The wire must be laid flat directly on the ground according to the MB 400 manual
It should be secured with stakes every 1 to 2 meters
Ensure that the loop is completely closed - a break or poor contact interrupts the signal
Maintain a distance of at least 1 meter from walls, trees, or obstacles

2. Clean the boundary sensors

The manual specifies that the sensors can easily get dirty with soil and debris. The MB 400 has boundary sensors (sides) that detect the signal from the wire. Dirt buildup prevents the robot from recognizing the available mowing space and keeps it stuck to the wire.

3. Check the continuity and connections of the wire

Inspect the wire along its entire length for cuts, damage, or sections raised off the ground
Check that the ends are properly connected to the MB 400 charging station
Check for any corrosion on the contacts

4. Check the battery and power

A low battery charge reduces the sensitivity of the sensors. Ensure that the MB 400 is fully charged (about 60 minutes for 400 m²) before testing.

5. Test the geometry of the area

If the wire delineates a very narrow or poorly proportioned area, the robot will stay stuck to the edges. The area must be wide enough and regular to allow free navigation.

If the problem persists, contact support to check the boundary sensor of the MB 400.

Question 9

How to manually program the YARDFORCE MB 400 lawn mower robot without a Wi-Fi connection?

Accepted Answer

Yes, you can manually program the YARDFORCE MB 400 lawn mower robot directly via its integrated control panel, without relying on a Wi-Fi connection or the CloudHawk app. The robot has physical buttons and a screen that allow you to fully configure the mowing schedule.

To access the programming settings, press the MENU button on the control panel located on top of the robot. Once in the menu, navigate using the directional buttons until you find the “Programming” or “Schedules” option. This section allows you to set the days and times of operation.

You can configure up to 7 different time slots per week. For each day, select the desired start and end times. The robot will automatically return to its charging base once the time slot is finished or when its battery reaches a low level. You can individually enable or disable each day to create a schedule tailored to your lawn.

Other settings you can adjust without Wi-Fi include the cutting height (adjustable between 20 and 60 mm), the working mode (automatic or manual), and the restricted zones if you have installed the perimeter boundary wire. These settings are also made via the control panel by navigating through the different menus.

Once your programming is complete, press the START button for the robot to apply your settings. The robot will adhere to the schedule you have set and will operate completely autonomously according to these times. If you wish to modify your settings later, you can always return to the menu to adjust them, even without using the mobile app.

The advantage of this manual programming is its total independence: no mandatory synchronization with a server, no loss of settings in case of internet connection loss, and direct control of the robot's operation from the device itself. The CloudHawk app remains optional and is really only useful if you want to control the robot remotely or receive notifications on your phone.

Question 10

Why does my YARDFORCE MB 400 robotic mower only move 10 cm before turning in circles?

Accepted Answer

If your YARDFORCE MB 400 robotic mower only moves 10 cm before turning in circles, it generally indicates a problem with obstacle detection or a dirty sensor. Here’s how to diagnose and correct this behavior:

Immediate Checks

Clean the collision sensors - The sensors located under the robot can easily get dirty with soil and debris. Use a dry cloth to clean the sensors at the front of the robot (obstacle detection) and the side sensors (perimeter wire detection).
Inspect and clean the mowing area - Check that no objects (stones, branches, debris) are blocking the robot's path in this area. The MB 400 stops as soon as it detects an obstacle and turns to look for another direction.
Check the wheels - Ensure that the wheels are not obstructed by grass or debris that could prevent normal movement.

Secondary Checks

Battery status - Check that the battery is charged to at least 50%. A low battery can limit power and create this behavior.
Programming settings - Check the robot's settings via the control panel or the Wi-Fi app to ensure that the mowing settings do not limit movement (reset the robot if necessary).
Damaged perimeter wire - If the robot incorrectly detects the limits of the wire, it may turn in place. Inspect the wire along its entire length for cuts or poor contact with the ground.

If the problem persists after these checks, it may be a mechanical failure (motors, drive system) or a faulty sensor that requires technical intervention.

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