Technical Support Center

By addressing these common issues, you can ensure your floor scrubber machine operates efficiently and effectively, providing a greener cleaner, and better performance for your facility. If you need any further assistance, please contact us service@sunmaxus.com

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SUNMAX Floor Scrubber Machine Troubleshooting Guide

The machine won’t turn on

If your floor scrubber machine won't turn on, follow these steps to troubleshoot the issue:

Check Power Supply:

  • Ensure the machine is plugged into a working electrical outlet.
  • If the machine uses a battery, make sure the battery is properly connected and charged.

Inspect Battery Connections:

  • Ensure all battery terminals and connectors are secure.
  • Look for any signs of corrosion or damage on the battery terminals.
  • Use a multimeter to check the battery voltage and let us know the reading.
  • If the battery is in low voltage self-protection mode or dead, please get new batteries for replacement, or try using a high current voltage to reactivate and charge the battery. Some technicians can also repair batteries.
  • If the voltage is too high, the battery may be in self-protection mode, preventing charging and causing the machine to stop suddenly. Turn on the machine to reduce the battery voltage to a normal level, then try using it again.

Examine the Power Cord and Plug:

  • Check the power cord for any visible damage or wear.
  • Make sure the plug is securely inserted into the outlet.
  • Test the outlet with another device to confirm it is working properly.

Test the On/Off Switch:

  • Ensure the machine's on/off switch is in the "on" position.
  • If the switch feels loose or unresponsive, it may be faulty and require replacement.

Check for Overcurrent Protection:

  • Some machines have an overcurrent protection feature. Check if the machine has an overload reset button and press it to reset the system.
  • Look for any tripped circuit breakers or blown fuses in the machine's electrical system.

Inspect Internal Wiring:

  • Open the machine's casing (if applicable) and inspect the internal wiring for any loose connections or damaged wires.
  • Ensure all connectors are securely plugged in.
  1. Examine the Control Panel:
  • Check the control panel for any error messages or indicator lights that might provide clues to the problem.
  • Ensure all control panel connections are secure.

The machine is not sucking enough water or not sucking water completely and there’s a smoky smell or loud noise/vacumm overload error

Check the Recovery Tank:

  • Empty Tank: Ensure the recovery tank is not full. A full tank can prevent proper suction.
  • Check the Lid of the Recovery Tank(Liquid Shut-off Valve): Ensure the lid is properly and securely closed and the seal is intact. Any gaps or damage to the seal can cause a loss of suction. Clean the sponge inside the lid, and then reassemble it.
  • Check the drain hose: Ensure the drain hose is not damaged. Tighten the cap and place the hose back in its original position.

Inspect the Vacuum Motor:

  • Power Supply: Confirm that the vacuum motor is receiving power. Check for any tripped breakers or blown fuses.
  • Operation: Listen for the motor to ensure it is running. If it is not, there may be an electrical issue or the motor may need repair. If there’s a loud noise, replace the motor.

Inspect the Vacuum Hose:

  • Clogs: Look for clogs or blockages in the vacuum hose. Remove any debris that may be obstructing the flow.
  • Connections: Ensure the hose is securely connected to both the machine and the recovery tank.

Examine the Squeegee Assembly:

  • Blades: Check the squeegee blades for wear and tear. Worn blades can prevent effective water pickup.
  • Adjustment: Make sure the squeegee assembly is properly adjusted to maintain even contact with the floor surface. Ensure the squeegee is tilted forward by 30-40 degrees, and one-third of the rubber strips are in contact with the ground.

Check the Filters:

  • Clogged Filters: Inspect and clean or replace the vacuum filters if they are clogged with dirt and debris. Clogged filters can restrict airflow and reduce suction.

Inspect the Solution System:

  • Solution Tank: Verify that the solution tank is not empty and that the solution is being dispensed properly. Without solution, the machine cannot effectively scrub and pick up water.
  • Water Valve: Check that the water valve is not blocked or malfunctioning.
  1. Check the Control Panel:
  • Error Codes: Look for any error codes or warning lights on the control panel. Refer to the user manual to interpret these codes and take appropriate action.
  • Wiring: Inspect the wiring connections to the control panel for any loose or damaged wires.

Video Resources：

RT50AC/RT50/RT50+/RT50D/RT50D+: https://www.youtube.com/watch?v=5SU4ni4H0xo

RT70/RT70+: https://www.youtube.com/watch?v=7qXGsYvjCj8

SM430: https://www.canva.com/design/DAFzohwWBvQ/TM23grP5bQJW1sL7PwlzXg/view

The brush/pad driver doesn’t spin

Check Power Supply:

  • Connection: Ensure the machine is properly plugged in or the battery is fully charged. Verify that the power switch is turned on.
  • Fuses and Breakers: Check for any tripped breakers or blown fuses that might be preventing the brush motor from receiving power.

Inspect the Brush Motor:

  • Operation: Listen for the motor when the machine is turned on. If you don’t hear it running, there could be an issue with the motor itself.
  • Electrical Connections: Ensure all electrical connections to the brush motor are secure and free from corrosion.

Check the Brush Deck:

  • Obstructions: Look for any debris or obstructions that might be preventing the brush from rotating.
  • Mounting: Ensure the brush is properly mounted and securely attached to the brush deck.

Inspect the Control Panel:

  • Error Code: There may be some error codes on the screen, take a picture and send it to the seller to verify.

Examine the Brush Itself:

  • Attachment: Make sure the brush is properly attached to the machine. Some brushes require specific alignment or locking mechanisms to be engaged.
  • Wear and Tear: Check the brush for excessive wear or damage that might impede its movement.

Test the Brush:

  • Manual Rotation: Attempt to rotate the brush manually to see if it moves freely. If it doesn’t, the brush assembly might have a mechanical issue.
  1. Check the Control Panel:
  • Error Codes: Look for any error codes or warning lights on the control panel. Refer to the user manual to interpret these codes and take appropriate action.
  • Wiring: Inspect the wiring connections to the control panel for any loose or damaged wires.

The machine is not dispensing enough water or no water at all

Check the Solution Tank:

  • Fill Level: Ensure the solution tank is filled with water or cleaning solution. An empty tank won't dispense water.
  • Lid and Seal: Verify that the tank lid is securely closed and that the seal is intact to prevent any vacuum loss.

Inspect the Hoses:

  • Clogs: Check for any clogs or blockages in the hoses. Debris can obstruct water flow.
  • Connections: Ensure all connections between the tank and the hoses are secure and free from leaks.

Examine the Solenoid Valve:

  • Operation: Ensure the solenoid valve is functioning properly. It should work to allow water to flow when the machine is in operation.
  • Power Supply: Ensure the solenoid valve is receiving power. Check for any tripped breakers or blown fuses.
  • Operation: Listen for the sound of the solenoid valve running when the machine is turned on. If it's silent, there may be an electrical issue or the pump may need repair or replacement.

Inspect the Spray Nozzles:

  • Clogs: Check the spray nozzles for clogs or blockages. Clean any debris that may be obstructing the nozzles.
  • Alignment: Ensure the nozzles are properly aligned and securely attached to the machine.

Check the Control Settings:

  • Water Flow Control: Verify that the water flow control is set correctly. There’s a water valve to the bottom of the machine, it is for adjusting the amount of water dispensed.
  • Mode Selection: Ensure the machine is set to the correct mode for dispensing water.

Inspect the Filters:

  • Clogged Filters: Check and clean or replace any filters in the water line. Clogged filters can restrict water flow.

Examine the Liquid Shut-off Valve (the lid of sewage tank):

  • Ensure the liquid shut-off valve on the sewage tank closed tightly, as this can prevent water from being dispensed.
  1. Check the Control Panel:
  • Error Codes: Look for any error codes or warning lights on the control panel. Refer to the user manual to interpret these codes and take appropriate action.
  • Wiring: Inspect the wiring connections to the control panel for any loose or damaged wires.

The machine can’t move forward or backward (self-propelled or ride-on models)

Check Power Supply:

  • Battery Charge: Ensure the battery is fully charged. A low or dead battery will prevent the machine from moving.
  • Connections: Verify that the battery connections are secure and free from corrosion.

Inspect the Drive Motor:

  • Power Supply: Ensure the drive motor is receiving power. Check for any tripped breakers or blown fuses.
  • Operation: Listen to the motor running when the machine is turned on. If it's silent, there may be an electrical issue or the motor may need repair or replacement.

Examine the Squeegee Assembly:

  • When the machine needs to move backward, be sure to lift the squeegee first.

Check the Control Settings:

  • Speed Control: Verify that the speed control settings are properly adjusted. Some machines have variable speed settings that might be set too low.
  • Mode Selection: Ensure the machine is in the correct mode for movement. 

Examine the Wheels and Axles:

  • Obstructions: Check for any debris or obstructions around the wheels and axles that might be preventing movement.
  • Condition: Ensure the wheels are in good condition and not excessively worn or damaged.
  1. Test the Safety Features:
  • Safety Switches: For ride-on models, ensure all safety switches (e.g., seat switch which is under the seat, parking brake which is close to the back wheel ) are properly engaged. The machines will not move if certain safety features are not activated.
  1. Check the Control Panel:
  • Error Codes: Look for any error codes or warning lights on the control panel. Refer to the user manual to interpret these codes and take appropriate action.
  • Wiring: Inspect the wiring connections to the control panel for any loose or damaged wires.

Machine Leaving Streaks

Potential Causes:

  • Brushes/Pads: Worn or dirty brushes/pads.
  • Water Solution: Incorrect detergent concentration or type.
  • Squeegee Blades: Worn or improperly adjusted blades.
  • Dirty Water Tank: Overfilled or not properly cleaned tank.

Troubleshooting Steps:

  • Brushes/Pads: Clean or replace as necessary.
  • Water Solution: Use the correct type and concentration of detergent.
  • Squeegee Blades: Inspect and adjust or replace blades.
  • Dirty Water Tank: Empty and clean the recovery tank regularly.

Unusual Noises

Potential Causes:

  • Loose Parts: Vibrating or loose components.
  • Debris: Objects caught in the brushes or drive system.
  • Motor Issues: Failing motor bearings or other internal problems.

Troubleshooting Steps:

  • Loose Parts: Tighten any loose screws or bolts.
  • Debris: Clear any debris from the brushes and drive system.
  • Motor: Inspect the motor and consider professional repair if necessary.

Why Water Can’t (or Shouldn’t) Get into the Vacuum Motor and How to Keep It Safe?

The vacuum motor in a floor scrubber machine is a critical and sensitive component, and it’s specifically protected from water by design to prevent failure. Here's how and why water is kept out:

Motor

1. Recovery Tank Separation

  • The vacuum motor pulls air from the recovery tank, not directly from the floor.
  • The tank collects dirty water, while a filter screen or float shutoff valve prevents water from reaching the motor.

2. Built-in Float Shutoff Valve

  • Inside the recovery tank, there's usually a float ball mechanism or electronic shutoff switch.
  • When water reaches a certain level, the float rises and blocks the airflow, preventing water from entering the vacuum motor.

3. Filter or Deflector System

  • Many scrubbers use a foam or mesh filter at the vacuum intake to block water droplets, dust, and debris.
  • These filters act as a moisture trap and help extend vacuum motor life.

4. Airflow Design

  • The airflow path is designed so only moist air (not liquid) reaches the vacuum motor.
  • If too much water or foam enters, the system either shuts off or bypasses excess liquid.

⚠️ What Can Go Wrong (If Water Does Get In):

  • 💥 Short-circuit or burnout of the vacuum motor
  • ⚠️ Mold or electrical corrosion
  • ❌ Loss of suction and early motor failure

Pro Tips to Keep Your Vacuum Motor Safe:

  • ✅ Empty the recovery tank regularly before it overfills
  • ✅ Use defoamer in the recovery tank to prevent foam from entering the motor
  • ✅ Clean filters weekly and check float shutoff is working
  • ✅ Never tilt the machine backward when water is in the tank—it can bypass the shutoff!

Here's a simple Vacuum Motor Protection Checklist for your floor scrubber machine—perfect for operators, janitorial teams, or service staff:

Vacuum Motor Protection Checklist

For Floor Scrubber Machines

✅ Use this checklist daily or weekly to prevent water damage and extend the life of your vacuum motor.

Before Operation

☐ Ensure recovery tank is empty before starting
☐ Add 1–2 oz of defoamer into the recovery tank (especially for soapy floors)
☐ Check that the float shutoff valve moves freely
☐ Inspect vacuum intake screen or filter for dirt or clogs
☐ Confirm vacuum motor wiring is dry and intact

💦 During Operation

☐ Monitor foam levels—stop if foam is rising too high
☐ Avoid using high-foam detergents (unless using defoamer)
☐ Do not overfill clean water tank—overflow can reach vacuum
☐ Keep machine level during use to prevent water shifting into motor path

🧼 After Operation

☐ Turn off vacuum motor before draining tanks
☐ Empty and rinse the recovery tank
☐ Wipe down and dry vacuum intake area
☐ Inspect and clean vacuum filter and float shutoff
☐ Store the machine with tanks open to air dry

🧠 Weekly Maintenance

☐ Remove and clean vacuum motor pre-filter or mesh
☐ Check all hoses and gaskets for leaks or cracks
☐ Test float shutoff functionality manually
☐ Confirm suction performance feels normal during use

Why the Batteries of My Floor Scrubber Machine Losing Power Quicker Than Before?

If your floor scrubber machine's batteries are losing power quicker than before, there are a few common culprits to check out. Here’s a breakdown to help you troubleshoot:

Battery Health & Maintenance

1. Age of the Batteries
Most deep-cycle batteries used in scrubbers have a lifespan of 2–5 years. If yours are getting up there in age, they may simply be wearing out.

2. Undercharging or Overcharging

  • Undercharging happens if the batteries aren’t being charged fully between uses.
  • Overcharging can occur if the charger isn’t shutting off properly or is left plugged in for too long.
  • Eco-smart tip: Use a smart charger that automatically stops when the battery is full.

3. Dirty or Corroded Terminals
Corrosion at the battery terminals can create resistance, causing the batteries to lose power more quickly. Give those terminals a clean with a mix of baking soda and water (and always wear gloves).

Usage Patterns

4. Increased Workload or Operator Habits
Are you using the machine more intensively or on rougher surfaces than before? That draws more power. Also, high brush pressure or vacuum settings can drain batteries faster.

5. Infrequent Use
Believe it or not, not using the scrubber regularly can also hurt battery life. If the machine sat unused for a while or wasn’t charged right after use, sulfation could have set in—this reduces how much energy your batteries can store. Load testing at a battery service center can confirm this.

Mechanical & Electrical Issues

6. Worn Brushes or Squeegees
When these parts wear down, the machine works harder to do the same job—draining the battery faster.

7. Motor or Controller Issues
A dragging brush motor, clogged vacuum motor, or faulty wiring could be drawing excess power. Might be worth a technician’s inspection.

Read More>>>

Additional Tips

  • Regular Maintenance: Perform regular maintenance to keep your machine in optimal condition. This includes cleaning filters, checking hoses, and inspecting brushes and squeegees.
  • User Manual: Always refer to the user manual for specific troubleshooting steps and maintenance recommendations from the manufacturer.
  • Professional Service: If troubleshooting steps do not resolve the issue, consider contacting a professional service technician for further diagnosis and repair.

Periodic Checklist for Floor Scrubber Machine

  • **Daily:**

    - Inspect battery charge level and recharge if necessary.

    - Check solution and recovery tanks for cleanliness.

    - Ensure brushes/pads are clean and not worn.

    - Empty and clean tanks after use.

    - Inspect vacuum hose and squeegee for blockages.

  • **Weekly:**

    - Inspect battery terminals for corrosion.

    - Check squeegee blades for wear and replace if needed.

    - Clean the machine’s exterior.

  • **Monthly:**

    - Test machine functionality (brush motor, vacuum, solenoid valve, filter valve).

    - Inspect all electrical connections.

    - Check for loose screws or bolts and tighten if necessary.

  • **Quarterly:**

    - Deep clean tanks and hoses.

    - Inspect and replace worn brushes/pads and squeegee blades.