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Karcher 411A stopped working

Pressure washing patio today.. 411A started running rough... vibration in hose . Thought it was lack of inlet pressure and air but no. noticable striped pattern in floor dirt cleaning when lance passed quickly over , suggesting a pulsating pressure flow. after 5 minutes washer just stopped and electrical buzzing continued. Took casing apart and could turn the armature manually so not seized. could it be the capacitor ?
Thanks for any help / ideas.

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5 Suggested Answers

  • 313 Answers

SOURCE: Water is pouring out of

seal or oring problem.see www.pressureparts.com for parts etc

Posted on Jul 08, 2008

  • 18 Answers

SOURCE: Karcher 2400R

You have a poor signal to the spark plug usually caused by a rusty fly wheel found underneath the pullcord casing. clean it with releasing ajent such as wd 40. common when not in use for a while.

Posted on Sep 19, 2008

  • 92 Answers

SOURCE: Karcher pressure washer won't start

Dear ralph_birtwi,
Most pressure washers when their gun is released, the machine stops automaticaly. This is done ny means of a control valve. When the gun is closed...pressure is built and the control valve moves and switches a micro switch off. In your case the micro switch is still closed in off position. Now this happens if a machine is left and stored with pressure in it., This control valve could get jammed and leaving the micro switch in off position. It could also stay in off position by sticking, due to incorrect chemical.
So the control valve or even called spill valve, must be renewed.
Sometimes a little lubrication with the right type of silicon grease will get the control valve working again. This job is sometimes delicate and better done by a qualified technician.
Regards,
fulltech.

Posted on Apr 12, 2009

  • 1 Answer

SOURCE: Karcher pressure washer 411A. loss of pressure...

411a when i turn on it gos for 1 min then i have too press it on and off 3or 4 times befor it works and it only stays on for 1 min.

Posted on May 21, 2009

  • 92 Answers

SOURCE: Electric Karcher pressure washer surging when turned on

Dear firenutt681,
One simple thing you can do, is to check for leaks. Check if hose at machine is leaking. Check gun if it is leaking. You can also check if water still comes out of lance nozzel. These leaks however so small, will cause the machine to surge.
Another reason is due to a faulty SPILL VALVE. This spill valve( often called CONTROL VALVE) will contract when the gun is closed. When it contracts under the enclosed pressure it will switch off the machine by means of a Micro Switch. Now if this Spill valve is faulty it will loose its compression under pressure and puts on the micro switch again. This can be seen once in a while or more frequent, as in your case. I sometimes do service Spill Valves, but mostly I replace them with a new one. I do not know the model number of your machine, but normally you have to open the cover and you should spot the spill valve on the head. Most probably you see a thick wire or a cap containing the micro swith. If you find the micro switch, you have found the spill valve. Sometimes it is a bit hard to pull out the spill valve. Myself, in various Karcher models I remove the spill valve by trying to feed water and put on a bit the machine. In this way the spill valve will be spitted out.
Another reason which makes your machine surge, is leakage from from the detergent inlet.
If you do not see no leakages at all....then for sure it is the SPILL VALVE.
If you cannot do this job yourself or you do not find spare parts...you can continue using the machine as it is...but before closing the gun...switch off the electricity. I only recommend this in an emergency. You do this so that you do not leave the machine surging. This surge will for sure damage the electric motor and the capacitor (assuming it is single phase).
Regards,
Fulltech.

Posted on May 30, 2009

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