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411a keeps stopping on for 4 mins off for2 mins on forabout 3 mins then off again and so one

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  • norhod Aug 31, 2010

    hansons repair dept in preston says no thermal switch in this particular machine

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Hello,

This is a Karcher #411a, right? Just wanted to make sure about the manufacturer.

From the symptoms that you are describing, your motor is cycling on the thermal overload protector. For some reason, the protector is heating up, tripping (opening the circuit to the motor), and when it cools down, allows you to use the pressure washer a little bit longer.

Given the fact that most of the pressure washers are stored outside in a shed or in garage, consider disassembling your washer. You are looking for nests made by insects (be careful!), as well as to locate the overload protector.

If your water pump is detriorating (losing oil perhaps), it may be putting a higher load on the motor, causing it to heat up abnormally.

I wasn't able to find your exact model #, perhaps there is a product # on the name tag as well. This site has a listing of all the Karcher part and assembly manuals.

Posted on Aug 31, 2010

  • Sheldon Dedek Aug 31, 2010

    If there is not a thermal protection in / on the motor, then the fault lies in 1 of 3 other areas:

    1) Wiring connection is heating up, losing contact, cooling, and re-establishing contact.
    2) GFI protection, if equipped, has an intermittent connection
    3) The pressure sensor is having issues.

    Since "Hansons Repair Depot" in Preston obviously has experience and will be able to physically check out this unit, I suggest that you take your pressure washer to them for repair / refurbishment.

  • Sheldon Dedek Aug 31, 2010

    If there is not a thermal protection in / on the motor, then the fault lies in 1 of 3 other areas:



    1) Wiring connection is heating up, losing contact, cooling, and re-establishing contact.

    2) Motor Protection, if equipped, has an intermittent connection

    3) The pressure sensor is having issues.



    Since "Hansons Repair Depot" in Preston obviously has experience and
    will be able to physically check out this unit, I suggest that you take
    your pressure washer to them for repair / refurbishment.

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