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Karcher Pressure Washer Control Head Parts Set Stock Number: ES538412

Karcher Pressure Washer Control Head Parts Set - ES538412

4.8 out of 5 Rated 4.8 out of 5(134 customers)

Genuine spare part for select Karcher pressure washers

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Manufactured by Karcher

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Pressure Washer Control Head Parts Set

So, your Karcher control head suffered some damage from the winter cold and water is spraying and leaking everywhere. This genuine replacement head will have your pressure washer back to new once more. 


  • Top pistons
  • Triangular rubber seal


You will need a torx head screwdriver to fit this part.

Please note: This part is chassis and serial number dependent. Please contact our call centre with these details so we can advise of the correct part for you. Your chassis number will look like: 1.504-604.0, and your serial number will be 6 digits long. 

For top tips on how to fit please read some of the customer reviews and comments that have been submitted.

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Here’s what other people are saying about Karcher Pressure Washer Control Head Parts Set.

(134 reviews)

4.8 out of 5

Ease of fitting 4 out of 5
Quality 4 out of 5
Value 3 out of 5
  • Chesterfield
    5.0 out of 5

    2nd time I've had to replace this part

    For the second time since owning my Karcher 5.55 I've had the pulsing issue, first time was back in 2013 when i believe it was frost damage, more recently it started pulsing during use in the summer. For this reason I've marked it down on Quality and Value, but happy it's fixed again.

    Ease of fitting 4.0 out of 5
    Quality 3.0 out of 5
    Value 3.0 out of 5
  • Nottingham
    4.0 out of 5

    Low pressure/ hunting K5.55

    A little overpriced you have to swap several parts over if they were damaged you would have to order additional parts Crack in control head on my unit Caused hunting and lowe pressure Fitted this part plus valve head job done sorted😀

    Ease of fitting 4.0 out of 5
    Quality 5.0 out of 5
    Value 3.0 out of 5
  • Swansea
    5.0 out of 5

    Great purchase

    Good quality part easy to fit, pressure washer working great 👍

    Ease of fitting 5.0 out of 5
    Quality 5.0 out of 5
    Value 5.0 out of 5
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Ask a Question

40 Questions and 43 Answers

Model is K5.55m

By weston denise - powys - 16 February 2012
  • I found an easyish way to seperate the control head from the alloy housing. As noted in the previous answer, first remove the silver nut and rotary connector then push out the red tube. I then used a 13mm followed by a 12mm socket as a drift in the hole with the threads where the rotary connector was attached and it was out in under a minute with very little damage. As the control head and housing are a flush fit and an awkward shape you just can't put the assembly on something flat and hit it so to to get some clearance I put the hex bolts back in the holes from the bottom and used a couple of bits of spare wood to stand it on before i hit it. By Alan T - Doncaster - 02 August 2013
  • its very difficult. You need to remove the silver nut ( tightly fixed ) , and then push out the internal washer/tube ( red in colour). We ended up pushing it out by having to damage the internal part of the control head ( which was being replaced anyway ). Its tight but will eventually come out. Try not to damage the detergent holder and the hose fitting below unless you have ordered new ones of these. We had to resort to a hammer and other tools to literally bang/force the part out. Good luck! By js - reading - 29 March 2012
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I have removed main asembly from body of washer but how do I remove actual contro; head asembly, the Detergent pipe conector is at right angles to whet looks like the slot to allow it be removed. do I need to turn it, as it feels quite ridgid.

By Trevor - Nottingham - 07 October 2011
  • Make sure the bolts that hold the casting cover are removed. You then need to wiggle the small detergent fitting assembly elbow 90° to allow the casting cover to pass. If its stubborn take extra care and do not force it because the plastic elbow is pritle and can break. By Dave - Manchester - 03 April 2012
  • just wiggle and pull all parts must be swapped so your old part resembles the new part received By Spenny - Rossendale - 07 October 2011
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Karcher 411A pressure pulsing when spraying ? When im using the pressure washer it pulses when i depress the trigger. Its not pulsing when the trigger is not depressed. Ive removed the case and watched it run. There is a pressure switch that cuts the power to the motor when the trigger isnt pressed to stop the pump destroying its self. This mechanical pressure switch is pulsing in and out as is the pressure is getting too high for the machine. So, im looking for any advise on why this pressure switch should pulse when the trigger is pressed. If i hold the switch forward with a screwdriver it runs fine! Can anyone help please!

By Tim - POntefract - 13 September 2010
  • There is a small non-return valve in the outlet connection, underneath the small triangle shaped block in the pump head, the valveis white nylon with a small O ring on the end and a light spring that holds it closed, if this valve passes it will allow the pressure switch to hunt off and on. A repair can be achieved by replacing this small valve head. By Anonymous - UK - 15 June 2013
  • Replace the pressure washer control head and the pressure washer cylinder head . normally fixes the prob. By G man - - 14 March 2011
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There is a leak on the black plastic cover that covers the 3 metal pistons. when you put the motor on the water appears from plastic cover mentioned by quite a lot but there dosent appear to be any cracks? can you please advise and what parts I will require to rectify the problem please.

By AJWHITE - - 09 August 2010
  • Hi, I had the same problem, it was a cracked seal, i was going to replace all 3 of the seals but for piece of mind i changed the whole cylinderhead. This came with a full set of seals, springs etc. So for a few pound more, you get to renew the whole cylinderhead plus the internal parts. By H1-5hine - S.Wales - 04 February 2012
  • Rory from eSpares
    Rory at eSpares says...

    Hi, check all tubing and cylinder head parts for cracks. If you can't find any, it may be one of the seals, check these too. Seeing as the leak is happening at this part on your washer but there's no cracks, it sounds like it could very well be a seal. Best of luck!

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Pulsing K5.50 2 Answers

Hi, Am having problems with my K5.50 it's constantly pulsing, when not in use, and I have also noticed it's slightly down on power. I have been told it could be the control head, but after removing this, I can't see any evidence of it leaking.... Help what do you think? Thanks

By Dazzy130 - Cleethorpes - 11 November 2009
  • I had a cracked control head body and cracked Vario lance nozzle in my K4.99M, and replacing these parts cured the pulsing and low pressure. I believe that these problems were caused by freezing damage. By rog3141 - Basingstoke - 19 June 2010
  • eSparesMalindi from eSpares
    eSparesMalindi at eSpares says...

    Unfortunately we cannot give out technical advice. Please go to Karcher or an engineer for help.

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