Kärcher K 390 M plus User Manual (English)

Questions and Answers:

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Oscar MooreAug 15, 2025
Why won't my Kärcher K 390 M plus motor start?
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  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.
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goodcarlAug 18, 2025
What to do if my Kärcher K 390 M plus Pressure Washer has low pressure?
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  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.
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Paul RoblesAug 22, 2025
What to do if my Kärcher K 390 M plus output pressure varies?
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  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.
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Mrs. Dana StevensonAug 25, 2025
Why is there no detergent coming out of my Kärcher K 390 M plus Pressure Washer?
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  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.
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Angela MillsAug 28, 2025
How to fix a leaking garden hose connection on my Kärcher K 390 M plus Pressure Washer?
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  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.
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Kyle Miller IIAug 31, 2025
Why is my Kärcher Pressure Washer pump so noisy?
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  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.
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sgrossSep 4, 2025
What to do if my Kärcher K 390 M plus Pressure Washer spray wand is leaking?
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  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.
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David BeckerSep 7, 2025
What does it mean if my Kärcher K 390 M plus Pressure Washer pump is leaking water?
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  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.
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Mrs. Crystal SchwartzSep 10, 2025
Why is my Kärcher Pressure Washer dripping oil?