The control board is the "brain" of a disinfection cabinet, responsible for regulating all core functions such as disinfection timing, temperature control, and mode switching. When the control board malfunctions, the disinfection cabinet may fail to start, run abnormally, or even pose safety risks. This guide sorts out common faults of disinfection cabinet control boards and provides step-by-step troubleshooting methods for both household and commercial users.

Pre-Troubleshooting Preparation

Before starting the troubleshooting process, it is critical to ensure personal safety and avoid secondary damage to the equipment:

Power off completely: Unplug the power cord of the disinfection cabinet and wait for 5–10 minutes to discharge the residual electricity in the control board capacitor.

Prepare basic tools: Prepare a multimeter (for voltage and resistance testing), a screwdriver set, insulating gloves, and a cleaning brush (for removing dust and debris).

Check the user manual: Locate the circuit diagram of the control board attached to the manual, which helps identify key components such as fuses, relays, and sensor connectors.

Common Faults and Corresponding Troubleshooting Steps

Fault 1: Disinfection Cabinet Fails to Start, and the Control Panel Has No Display

This is the most common fault, usually related to power supply abnormalities or control board burnout.

Check the power supply circuit

First, test whether the power outlet is energized: Plug in another electrical appliance (such as a phone charger) to verify if the outlet works normally.

Inspect the power cord of the disinfection cabinet for damage, breaks, or loose plugs. If the cord is damaged, replace it with a matching original accessory.

Test the control board fuse

Open the back cover of the disinfection cabinet to find the fuse on the control board (usually a small cylindrical component).

Use a multimeter to measure the resistance of the fuse: If the resistance value is infinite, the fuse is blown.

Replace the fuse with one of the same specification (same voltage and current rating). Note: Do not use a fuse with a higher rating, as this may cause the control board to overheat and burn.

Inspect the control board power supply module

If the fuse is intact but there is still no display, use a multimeter to measure the input voltage of the control board (usually AC 220V for household models). If there is input voltage but no output voltage to the display screen, the power supply module of the control board is damaged and needs to be replaced.

Fault 2: Control Panel Displays Normally, but the Disinfection Function Cannot Be Activated

In this case, the power supply to the control board is normal, but the signal transmission between the control board and the execution components (such as heating tubes, ultraviolet lamps) is faulty.

Check the function button failure

Press each function button on the control panel in turn. If the buttons are unresponsive or stuck, the button panel may be contaminated with dust or liquid.

Disassemble the control panel, wipe the button contacts with alcohol cotton, and check if the button circuit is loose. Reinstall the panel and test again.

Verify the relay on the control board

The relay is responsible for transmitting the control board's instructions to the execution components. Use a multimeter to measure the coil resistance of the relay: If the resistance is 0 or infinite, the relay is damaged.

Replace the faulty relay with a product of the same model. Ensure that the wiring is consistent with the original connection to avoid reverse connection.

Check the sensor connection

Temperature sensors and door switch sensors are closely linked to the start of disinfection functions. If the door switch sensor is loose, the disinfection cabinet will not start for safety protection.

Unplug the sensor connector on the control board, clean the metal contacts, and reinsert it firmly. Test whether the disinfection function can be activated after closing the cabinet door tightly.

Fault 3: Disinfection Cabinet Runs Abnormally (e.g., Overheating, Timing Deviation)

Abnormal operation is mostly caused by the failure of the control board's detection or regulation module.

Troubleshoot overheating faults

Overheating is often due to the control board failing to receive the temperature sensor's signal and stopping heating in time. Use a multimeter to measure the sensor's resistance at room temperature (the resistance value of most disinfection cabinet temperature sensors is 5–10 kΩ).

If the resistance value is abnormal, replace the temperature sensor. If the sensor is normal, the problem lies in the control board's signal processing chip, which requires professional maintenance or board replacement.

Solve timing deviation problems

If the disinfection time is significantly shorter or longer than the set time, the control board's timer module is faulty.

For digital control boards, check whether the crystal oscillator (a small rectangular component on the board) is loose or damaged. Re-solder the crystal oscillator or replace it with a new one of the same frequency.

Fault 4: Control Board Displays Error Codes

Many disinfection cabinets will display error codes (such as E1, E2) when the control board fails, which correspond to specific fault types.

Check the error code manual: Find the error code explanation in the user manual (e.g., E1 usually means temperature sensor failure, E2 means door switch abnormality).

Targeted troubleshooting: According to the manual's prompts, directly check the corresponding components. For example, if E1 is displayed, focus on testing the temperature sensor and its connection to the control board.

Post-Troubleshooting Notes

Reassemble and test: After troubleshooting and replacing faulty components, reassemble the disinfection cabinet, plug in the power supply, and test all functions in sequence. Observe whether the control panel display, disinfection timing, and temperature control are normal.

Preventive maintenance: Regularly clean the dust on the control board (every 3–6 months) to avoid short circuits caused by dust accumulation; avoid spilling water or cleaning agents on the control panel during use.

Seek professional help when necessary: If the control board has obvious burnout (such as charred components, burnt smell) or the fault cannot be resolved after the above steps, do not disassemble it by yourself. Contact the after-sales service to replace the original control board.

Conclusion

The key to troubleshooting the disinfection cabinet control board is to "diagnose from simple to complex"—starting with checking the power supply and external components before inspecting the internal modules of the board. Most common faults can be solved by replacing small components such as fuses, relays, or sensors. For complex faults involving chips and circuit traces, professional maintenance is the safest choice. Regular maintenance can significantly reduce the failure rate of the control board and extend the service life of the disinfection cabinet.