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Kärcher K 390 M plus - User Manual

Kärcher K 390 M plus
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High Pressure Washer Operator Manual
Overview ................................................................................... 2
Precautions ............................................................................ 2-4
Assembly Instructions .............................................................. 4
Operating Instructions.............................................................. 5
Using the Accessories.............................................................. 6
Working with Detergents .......................................................... 7
Shut Down and Clean-Up ........................................................ 8
Taking a Break .......................................................................... 8
Winterizing and Long-Term Storage ........................................ 8
Cleaning Tips .......................................................................9-10
Optional Cleaning Accessories .............................................. 10
Troubleshooting .................................................................11-12
Specifications
Max. Pressure 1400 PSI
Max. Water volume 1.7 GPM
Voltage 120 V
Amp draw 13 AMPS
5.959-911 / 04.01
Please keep the original box, packaging and receipt.
Before operating this unit, please read this manual
thoroughly and retain it for future reference.
Model K 390 M plus
French ........................... 13

Table of Contents

Questions and Answers

  • O
    Oscar MooreAug 15, 2025
    Why won't my Kärcher K 390 M plus motor start?
    • D
      Daniel GrayAug 15, 2025
      Several factors can prevent your Kärcher Pressure Washer's motor from starting. Ensure the On/Off switch is in the “ON” (I) position and that the power cord is properly plugged in. If you're using an extension cord, make sure it's not too long or damaged; use a 25 ft. 12/2 gauge cord or a 50 ft. 10/2 gauge cord. Try a different electrical outlet to rule out power supply issues. Finally, check if the circuit breaker has tripped and reset it if necessary.
  • G
    goodcarlAug 18, 2025
    What to do if my Kärcher K 390 M plus Pressure Washer has low pressure?
    • S
      Sarah BrownAug 18, 2025
      If your Kärcher Pressure Washer isn't reaching high pressure, the issue could stem from several causes. First, ensure you're using a 3/4 inch garden hose. Check the hose for any kinks, leaks, or blockages that might be restricting water supply. Make sure the water source is fully open. Also, inspect the water inlet filter for clogs and rinse it out in warm water if needed. Finally, verify that the spray wand is set to the high-pressure position.
  • P
    Paul RoblesAug 22, 2025
    What to do if my Kärcher K 390 M plus output pressure varies?
    • J
      Joshua WilliamsAug 22, 2025
      If the output pressure of your Kärcher Pressure Washer fluctuates, here's what to check: Ensure the water supply is fully open and inspect the garden hose for kinks, leaks, or blockages. Verify that all hoses and fittings are airtight to prevent the pump from sucking air; if it is, turn off the machine and purge the pump by squeezing the trigger gun until a steady water flow emerges from the nozzle. Also, check the water inlet filter for clogs and clean it in warm water. Clear any obstructions from the discharge nozzle using a fine needle. If the gun, hose, or spray wand is calcified, run distilled vinegar through the detergent suction tube.
  • M
    Mrs. Dana StevensonAug 25, 2025
    Why is there no detergent coming out of my Kärcher K 390 M plus Pressure Washer?
    • J
      Jason LeeAug 26, 2025
      If your Kärcher Pressure Washer isn't dispensing detergent, start by checking that the detergent suction tube is properly connected. If the detergent is too thick, dilute it. Inspect the filter on the detergent suction tube for clogs and rinse it with warm water to remove any debris. If the detergent suction tube is damaged or clogged, clear the obstruction or replace the tube. Ensure the spray wand is in the low-pressure position. Lastly, check the discharge nozzle for obstructions and clear them with a fine needle.
  • A
    Angela MillsAug 28, 2025
    How to fix a leaking garden hose connection on my Kärcher K 390 M plus Pressure Washer?
    • E
      Elizabeth PerryAug 28, 2025
      If your garden hose connection is leaking on your Kärcher Pressure Washer, first tighten the fittings. If the leak persists, inspect the rubber washer for wear or if it's missing, and insert a new washer.
  • K
    Kyle Miller IIAug 31, 2025
    Why is my Kärcher Pressure Washer pump so noisy?
    • B
      brownsophiaAug 31, 2025
      A noisy pump in your Kärcher Pressure Washer often indicates that the pump is sucking air. To resolve this, check that all hoses and fittings are airtight. Then, turn off the machine and purge the pump by squeezing the trigger gun until a steady flow of water emerges through the nozzle.
  • S
    sgrossSep 4, 2025
    What to do if my Kärcher K 390 M plus Pressure Washer spray wand is leaking?
    • A
      Andre BrooksSep 4, 2025
      If your Kärcher Pressure Washer's spray wand or extension is leaking, ensure the spray wand is correctly inserted into the spray wand extension, pressing against the spring tension and twisting it into the locked position. Also, check that the spray wand extension is properly attached by sliding it into the gun and turning the wand collar clockwise until tight. If the o-ring or plastic insert is broken, you will need to contact a service center to order a repair kit.
  • D
    David BeckerSep 7, 2025
    What does it mean if my Kärcher K 390 M plus Pressure Washer pump is leaking water?
    • J
      joseph08Sep 7, 2025
      It's permissible for your Kärcher Pressure Washer to leak up to 10 drops of water per minute from the pump. If the leakage is more than that, ensure that all fittings are tight. If the leak persists, it may indicate that the water seals are damaged or worn, in which case you should contact a service center.
  • M
    Mrs. Crystal SchwartzSep 10, 2025
    Why is my Kärcher Pressure Washer dripping oil?
    • E
      Erin LewisSep 12, 2025
      If your Kärcher Pressure Washer is dripping oil, it likely means the oil seals are damaged or worn. Contact a service center for assistance.

Summary

Specifications

Overview

Critical Safety Warnings

List of critical safety rules prohibiting misuse and hazardous operations of the pressure washer.

Important Precautions

Extension Cord Guidelines

Guidelines for selecting and using appropriate extension cords for the pressure washer.

Double Insulation Feature

Explanation of the double-insulated product design and servicing requirements.

General Cautions

General cautions regarding maintenance, detergent use, and potential warranty voidance.

Assembly Instructions

Water Supply Requirements

Details on water hose diameter, flow rate, and temperature for optimal pressure washer performance.

Operating Instructions

Using Accessories

High;Low Pressure Nozzle

Description and usage of the high/low pressure nozzle for different cleaning tasks.

Wash Brush

Information on using the wash brush for removing stubborn dirt from finished surfaces.

Rotary Nozzle

Details on the rotary nozzle's dirt-cutting action and limitations for certain surfaces.

Working with Detergents

Detergent Usage Cautions

Warnings against using specific chemical types and their potential damage to the unit.

Shutting Down and Clean-Up

Taking a Break

Procedure for temporarily stopping operation, engaging the safety lock and turning off the unit.

Winterizing and Long-Term Storage

Cleaning Tips

Deck Cleaning Guide

Instructions for cleaning decks using detergent or water, including nozzle recommendations.

House Siding Cleaning Guide

Steps for cleaning house siding, including detergent application and brush usage.

Cleaning Patios, Brick & Stone

Guidance on cleaning patios, brick, and stone surfaces with pressure washing.

Cleaning Vehicles and Boats

Procedure for cleaning cars, boats, and motorcycles with detergent and brush attachments.

Cleaning Tips Continued

Grill, Tool, and Furniture Cleaning

Tips for cleaning grills, outdoor equipment, tools, and lawn furniture with specific advice.

General Cleaning Recommendations

Advice on testing surfaces and caution for painted or peeling surfaces.

Optional Cleaning Accessories

Karcher 2 Year Warranty

Troubleshooting

Motor Issues

Solutions for the motor failing to start, including power and connection checks.

Low Pressure Problems

Troubleshooting steps for low or no high pressure, including water supply and filters.

Variable Pressure Issues

Diagnosing and fixing output pressure variations due to water supply or pump issues.

Troubleshooting Continued

Detergent Flow Issues

Resolving problems with no detergent being drawn or applied by the unit.

Leak Issues

Guidance on fixing leaks at garden hose connections, spray wands, and extensions.

Pump Noise and Leaks

Addressing pump noise, air sucking issues, and permissible water or oil leaks.

Kärcher K 390 M plus Specifications

General IconGeneral
BrandKärcher
ModelK 390 M plus
CategoryPressure Washer
LanguageEnglish

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