Q: Does the Kärcher RM 555 detergent need to be diluted?

Yes, the RM 555 detergent must be diluted before use. It is a concentrate that needs to be mixed with water according to the manufacturer's instructions. Recommended dosage The standard dilution is 1:10 (1 part detergent to 10 parts water), although you can adjust this ratio depending on the level of dirt and the type of surface to be cleaned. Application with the K 2 Horizontal You have two options for applying the diluted detergent to your Kärcher K 2 Horizontal pressure washer: Use the Plug n Clean system if your model is equipped with it - this system allows for direct injection of the product into the circuit Pre-apply the detergent manually with a sponge or sprayer, then let it sit for a few minutes before rinsing Operating procedure After applying the diluted detergent, let it act briefly on the surface, then rinse thoroughly with water using your high-pressure cleaner to completely remove the product. Tip: Always check the instructions for the RM 555 detergent on the packaging for precise dosages suitable for your type of work (light, medium, or intensive cleaning).

Question 1

How to remove the clip from the spray gun?

Accepted Answer

The clip of your Kärcher K 3 Classic spray gun is used to secure the lance. To remove it:

Locate the plastic clip at the end of the gun
Gently press on both sides of the clip to release it
Carefully pull the lance towards you to detach it

This operation allows you to replace the lance or access the inside of the gun for cleaning. Handle with care to avoid damaging the clip.

Question 2

Does the Kärcher RM 555 detergent need to be diluted?

Accepted Answer

Yes, the RM 555 detergent must be diluted before use. It is a concentrate that needs to be mixed with water according to the manufacturer's instructions.

Recommended dosage

The standard dilution is 1:10 (1 part detergent to 10 parts water), although you can adjust this ratio depending on the level of dirt and the type of surface to be cleaned.

Application with the K 2 Horizontal

You have two options for applying the diluted detergent to your Kärcher K 2 Horizontal pressure washer:

Use the Plug n Clean system if your model is equipped with it - this system allows for direct injection of the product into the circuit
Pre-apply the detergent manually with a sponge or sprayer, then let it sit for a few minutes before rinsing

Operating procedure

After applying the diluted detergent, let it act briefly on the surface, then rinse thoroughly with water using your high-pressure cleaner to completely remove the product.

Tip: Always check the instructions for the RM 555 detergent on the packaging for precise dosages suitable for your type of work (light, medium, or intensive cleaning).

Question 3

How to replace the connection or attachment of the drain hose if it is broken?

Accepted Answer

If the connection (attachment) of the drain hose of your Kärcher K5 Full Control is broken, you have two options:

1. Order the replacement part

Contact an authorized Kärcher service center or search on spare parts websites (Spareka, PCDT, etc.) for the original replacement part for the K5 Full Control. Provide the exact model number to ensure you order the correct connection.

2. Before any intervention

Turn off the device and unplug it from the electrical outlet
Completely drain any residual water from the system (the water may be hot - wait for it to cool down)
Precisely identify the damaged connection (water inlet connection or outlet connection)

3. Replacing the connection

Once the replacement part is received, unscrew the old broken connection and screw in the new one tightly, but without forcing it to avoid damaging it again. Test for leaks with water before full use.

Tip: If you do not feel comfortable with this procedure, a Kärcher service center can perform the replacement for you.

Question 4

How to clean the filter of the Kärcher K3 Home & Pipe?

Accepted Answer

To clean the filter (siivilä) of the Kärcher K3 Home & Pipe, follow these steps:

Removing the filter

Detach the quick coupling by pushing the high-pressure connector housing in the direction of the arrow indicated on the device, then remove the hose.
Carefully remove the filter located inside using small pliers or a similar tool, taking care not to bend or damage it.

Cleaning

Rinse the filter under running water.
Do not twist or force the filter during cleaning.
Check for any residues or debris.

Reassembly

Reinsert the filter in position once dry.
Reconnect the hose to the quick coupling.

Regular maintenance of the filter prevents clogging and maintains the performance of your high-pressure cleaner.

Question 5

How to replace the capacitor of the Kärcher K 6.250 EU?

Accepted Answer

Replacing the capacitor is not a user-serviceable intervention.

The Kärcher K 6.250 EU is designed as a non-maintainable internal device. Any intervention on electrical components, including the capacitor, must be carried out by an authorized Kärcher service center.

If your pressure washer is experiencing issues related to the capacitor:

Contact the official Kärcher customer service in your area
Check the technical support contact details in the user manual provided
Request a quote for the intervention and replacement parts

Any attempt at personal repair may void the warranty of the device.

Question 6

Why does my Kärcher K3 Power Control Home turn on and off continuously even when holding the pressure lever?

Accepted Answer

If your Kärcher K3 Power Control Home keeps restarting despite holding the pressure lever, it generally indicates that the device is not establishing pressure correctly. Here are the causes and solutions to check.

Check the water supply
The device requires a minimum flow rate of 8 liters per minute to operate correctly.

Fully open the water tap
Check that the hose is not kinked, crushed, or blocked
Ensure that the water pressure from your network is sufficient (maximum recommended pressure: 1.2 bar at the inlet)
Check that the flow at your water source is adequate

Clean the filtration elements
A clogged sieve can prevent pressure from being established and cause automatic restarting.

Turn off the device and unplug it
Remove the sieve (filter) from the water supply connection using flat pliers
Clean it thoroughly under running water
Reinstall the sieve and test again

Purge the air from the system
The presence of air in the circuit can prevent pressure from being established.

Turn on the device for a maximum of 2 minutes WITHOUT connecting a lance
Press the trigger lever and wait for the water to flow out without air bubbles
Then connect the lance and test the operation

Important
If the device does not establish pressure within 2 minutes, turn it off immediately to avoid dry running of the pump which could damage it. Do not attempt to restart it continuously without identifying and resolving the issue. If after these checks the K3 continues to restart, it may indicate a malfunction of the pressure switch or pressure sensor. Contact Kärcher customer service with proof of purchase for a warranty-covered intervention for 2 years.

Question 7

How to resolve the jerking of my Kärcher K3 Home & Pipe?

Accepted Answer

If your Kärcher K3 Home & Pipe is operating in jerks or stutters, here are the most common causes and how to resolve them:

1. Air in the system (most frequent cause)

Start the device without the high-pressure hose connected and let the water run for 1 to 2 minutes until it flows regularly without air bubbles. Then reconnect the hose. This purges the air accumulated in the pump.

2. Clogged nozzle or sprayer

Examine the nozzle and clean its opening with a fine needle, then rinse with clear water. A clogged sprayer causes irregular pressure and interruptions.

3. Clogged water inlet filter

Inspect and clean the filter at the water intake (located on the inlet connection). A clogged filter reduces flow and causes jerky operation.

4. Insufficient water pressure

Check that the water supply hose is not bent or crushed. Also, ensure that the tap is fully open to guarantee sufficient flow to the pump.

5. Thermal protection activated

If the device has been running for a long time without a continuous flow of water (without pressing the trigger), the safety system may activate. Allow it to cool for a few minutes before using it again.

Start by purging the air - this resolves the issue in most cases.

Question 8

How do I change the battery in the gun?

Accepted Answer

The K5 Full Control pressure washer is equipped with a pressure LED display powered by batteries. This display allows you to monitor the pressure in real-time and use the Full Control system. You need to replace the batteries when the screen shows nothing or when the display is weak.

Required batteries: 2 AAA batteries (alkaline or rechargeable). Before you begin, turn off the device and unplug the power cord.

Replacement steps:

Press the closure slider (item 22) of the battery compartment, located on the side of the gun, to unlock access.
Open the battery compartment cover (item 20) by gently lifting it.
Remove the two used batteries from the compartment.
Insert the two new AAA batteries, ensuring the correct polarity (+/-) as indicated by the symbols engraved inside the compartment cover.
Close the battery compartment until you hear a click confirming it is securely closed.
Dispose of the used batteries according to local regulations for battery recycling.

Once the batteries are replaced, the LED display and the pressure level selection function (MIX, SOFT, MEDIUM, HARD) of the Full Control system should work normally. If the screen remains blank after replacement, check that the polarity is correct and that the batteries are properly seated in the compartment.

Question 9

Is the SH 5 suction hose compatible with the Kärcher K 4.700 MD pressure washer?

Accepted Answer

The SH 5 suction hose is an accessory designed for certain models of Kärcher pressure washers to allow the suction of water from an external source (such as a bucket or tank).

Regarding compatibility with the Kärcher K 4.700 MD model:

The K 4.700 MD is compatible with the SH 5 suction hose, which can be used to suck up non-potable water in addition to the usual water supply.
This hose connects directly to the lance or the gun of the pressure washer, according to the installation instructions provided by Kärcher.
Using this hose expands the usage possibilities of the K 4.700 MD, especially in areas without direct water connection.

Be sure to follow the usage and maintenance instructions for the suction hose to ensure optimal operation and avoid any risk of damage to the device.

Question 10

Why is water leaking inside the Kärcher K4 Power Control pressure washer?

Accepted Answer

If water is leaking inside your Kärcher K4 Power Control pressure washer, it may indicate a sealing issue or an internal leak. Here are the steps to identify and resolve this problem:

1. Check the connections and hoses

Ensure that all connections, hoses, and fittings are properly installed, tightly secured, and in good condition. A damaged or improperly attached hose can cause water leaks inside the unit.

2. Inspect the seals

Worn or damaged seals can allow water to pass through. Inspect the seals on the connections, pump, and other accessible parts. Replace them if necessary.

3. Check the detergent tank

If you are using a detergent tank, make sure it is properly closed and does not have any cracks or leaks that could cause internal leakage.

4. Immediate shutdown and cooling

In case of an internal leak, immediately turn off the unit and allow it to cool down before proceeding with any handling to avoid any electrical or mechanical hazards.

If the problem persists after these checks, it is recommended to contact a specialized after-sales service for a thorough diagnosis and appropriate repair.

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