How To Fix KARCHER Window Vac Not Charging? – 5 Fixes!

The KARCHER Window Vac is a convenient tool designed to simplify glass cleaning tasks by effectively vacuuming condensed moisture from windows, mirrors, and car windshields. While I purchased this tool in 2021 and initially found it to work well, unfortunately, it ceased functioning last week. Upon inspecting the device, I identified the root of the problem as a charging issue.

If your KARCHER Window Vac is no longer charging and leaves your glass windows dirty, the likely culprit is either a defective charging circuit module or a dead battery due to moisture leakage within the chamber.

However, there is still hope for resolving the charging problem of your KARCHER Window Vac. In the following guide, I will outline the steps to address and fix the issue with your KARCHER Window cleaner.

Why is My KARCHER Window Vac Not Charging?

The inability of your KARCHER Window Vac to charge can be attributed to various common factors, including a dirty charging port, a broken or frayed charging cable, a defective charging circuit, or a faulty lithium-ion battery. These issues often arise due to the presence of moisture inside the circuit box, where both electronic and mechanical components are housed.

In my situation, the problem resided with the lithium-ion battery. Upon replacing the battery, my device sprung back to life and began functioning as expected.

If you encounter a similar issue and need to address it, you can purchase a replacement 18650 Li-ion battery from Amazon. You may also consider acquiring a new charging board module, which should be available for approximately $5.

How To Fix KARCHER Window Cleaner Not Charging?

If your window vacuum cleaner is not charging when plugged in, there are several potential solutions to explore:

1- Clean charging port

One of the primary reasons for charging issues is a dirty charging port. To address this problem, you can use a can of compressed air to clean the charging port thoroughly. Be sure to check for any dirt or debris that might be obstructing the smooth flow of electricity. By keeping the charging port clean and free from obstructions, you can improve the charging performance of your device.

2- Use another power outlet

Indeed, you are correct. While basic troubleshooting is essential, sometimes charging issues can be attributed to problems with the wall outlet rather than the device itself.

After cleaning the charging port, it is advisable to test the charger by plugging it into another power outlet. There is a chance that the power outlet you are currently using could be faulty, leading to the charging problem. By trying a different power outlet, you can determine whether the issue lies with the device or the electrical source. This step will help you identify and address the root cause of the charging problem more effectively.

3- Try a new charger

Before delving into potential internal issues, it is crucial to verify the functionality of your charger.

To do this, you can try using another KARCHER charger if you have one available. If the charging problem persists even with a different charger, it suggests that the issue may lie within your KARCHER window vacuum.

In such a situation, it is advisable to proceed with opening up your KARCHER window vacuum to further investigate and address the underlying problem. However, exercise caution while doing so and consider seeking guidance from the manufacturer’s manual or a professional if needed. Proper diagnosis and troubleshooting can lead to an effective resolution of the charging issue.

4- Check the circuit module

The next step is to examine the circuit module, which requires disassembling your KARCHER window vacuum.

Before proceeding, gather the necessary tools for the disassembly process. Ensure you have a set of screwdrivers suitable for the vacuum’s screws, safety gloves to protect your hands, a knife for careful opening, and some dry cloths to wipe any moisture or dirt you might encounter.

Once you have the required tools, proceed with caution and carefully open up your KARCHER vacuum cleaner to access the circuit module for inspection. Remember to follow proper safety measures and, if uncertain, consider referring to the manufacturer’s instructions or consulting a professional for guidance during this disassembly process.

  1. First of all, detach the vacuum head apart from the device.
  2. Remove all the rubber covering with the help of a knife (do not cut them because we’ll use them again).
  3. Unscrew everything and separate both covers carefully.
  4. Remove the logic board outside.
  5. Test the battery with a multimeter and replace it if the reading is less than 1.5 volts. Buy this battery replacement on Amazon.
  6. Clean the circuit module with rubbing alcohol and wipe it with a dry cloth.
  7. Connect the charger and check the voltage where the battery terminals connect. (There should be more than 3.7V reading, if not, replace the circuit module also).
  8. Oil the electric motor.

Plug in the charger and check if your window vacuum’s battery starts charging. If the battery still fails to charge despite attempting the troubleshooting steps, it may be time to consider purchasing a new window vacuum cleaner to ensure efficient glass cleaning.


I trust this guide has proven helpful in addressing your KARCHER Window Vac not charging issue. If you have any doubts or queries, please feel free to leave them in the comments section below. I’ll be more than happy to assist you further and provide any additional support you may need.

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