Question about Karcher 2500 PSI Pressure Washer

3 Answers

Electric Pressure Washer

I have a minimally used pressure washer rated at 1750 psi and electric.
AFter  plugging in the supply hose and power, I turn the unit on and it starts for a second to pressurize the system (as it usually does), but then when I press the nozzle, nothing happens; the motor doesn't start.  So if I unplug the water supply and power and let it sit for a few minutes, then do it all over again...the same issue happens...it starts for a second to pressurize the system then stops.  The unit is clean and no rust.  I'm not sure what component makes the unit trip off line.  Help!

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  • karcherhater Mar 30, 2008

    Karcher 3.92M no pressure, brought to an authorized repair shop . They said parts unavailable for this model, No rust internally 2 years old stored inside.

  • Anonymous Jun 08, 2008

    I have a small electric 1400 psi washer. It did exactly the same thing when I started it. Expect it never started again, even after unplugging everthing and replugging.

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Hi Your problem is your unloader pressure valve switch.It is a cylinder that moves up & down inside a housing,. activaded by water pressure.Inside the cavity of the housing is dirt on the wall of it.Thats your problem.Once you clean the cylinder wall & apply some water grease ,problem gone.Your problem is not the switch.

Posted on Feb 14, 2008

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Hi Your problem is your unloader pressure valve switch.It is a cylinder that moves up & down inside a housing,. activaded by water pressure.Inside the cavity of the housing is dirt on the wall of it.Thats your problem.Once you clean the cylinder wall & apply some water grease ,problem gone.Your problem is not the switch.

Posted on Feb 14, 2008

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Try running the machine without the hose attached if the machine runs ok then it is probable the there is a blockage in the nozzle if the the machine still cuts out then the pressure switch will probably be stuck or faulty this switch will be inline with the on/off switch and the motor it can be checked using a multi meter after dissconecting the power.

Posted on Jan 02, 2008

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Posted on Jan 02, 2017

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LF Error code: LF stands for long fill and occurs when the water level does not change for a period of time after the valves are turned on.

All washers are designed to operate with a water supply pressure of 20-100 PSI. When the pressure drops below 20 PSI the washer can have the following problems:

* Slow Fill- low water pressure reduces the speed at which water flows into the machine.
o Verify the pressure at all other water sources in the house (i.e. sinks, showers, etc..). If you find other places where the pressure is low, the problem is not with the machine but with the water supply.
* Continuous Fill- The valve may not fully seat under 20 PSI which would allow for a constant flow even when the machine is not supposed to be filling.
o Contact the water company to verify the pressure being supplied to the house.
* dispenser- Needs a minimum amount of pressure to function. May dispense constantly, at the wrong time, or not at all.
o A plumber may need to be consulted if the pressure is found to be too low.

Things you can check :

* Are the Hot and Cold water faucets turned on
* Are the water hoses kinked
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* Are the screen inside the water valve plugged
o Inlet valve should be free of debris and rust.
o Turn off water and remove the inlet hoses from washer.
o Remove any accumulated film or particles.
o Assure rubber washers are in the end of each inlet hose.
o Reinstall hoses, turn on water and check for leaks.

Error codes can be caused by a Power Surge or other electrical anomaly,attempt to return the washer to operation by following the Hard Reset procedure below.

1. Unplug or turn the circuit breaker off for 30 seconds.
2. Reconnect the unit to the power source by turning the breaker back on or plugging the unit back into the wall outlet.
3. Press the Pause/Cancel/Stop button twice to clear the display.
4. Start a short cycle to check the operation of the machine by selecting a cycle and pressing and holding the start button until the machine starts


Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

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1 Answer

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LF Error code: LF stands for long fill and occurs when the water level does not change for a period of time after the valves are turned on.

All washers are designed to operate with a water supply pressure of 20-100 PSI. When the pressure drops below 20 PSI the washer can have the following problems:

* Slow Fill- low water pressure reduces the speed at which water flows into the machine.
o Verify the pressure at all other water sources in the house (i.e. sinks, showers, etc..). If you find other places where the pressure is low, the problem is not with the machine but with the water supply.
* Continuous Fill- The valve may not fully seat under 20 PSI which would allow for a constant flow even when the machine is not supposed to be filling.
o Contact the water company to verify the pressure being supplied to the house.
* dispenser- Needs a minimum amount of pressure to function. May dispense constantly, at the wrong time, or not at all.
o A plumber may need to be consulted if the pressure is found to be too low.

Things you can check :

* Are the Hot and Cold water faucets turned on
* Are the water hoses kinked
o Make sure all the hose are straight and able to flow water
* Are the screen inside the water valve plugged
o Inlet valve should be free of debris and rust.
o Turn off water and remove the inlet hoses from washer.
o Remove any accumulated film or particles.
o Assure rubber washers are in the end of each inlet hose.
o Reinstall hoses, turn on water and check for leaks.

Error codes can be caused by a Power Surge or other electrical anomaly,attempt to return the washer to operation by following the Hard Reset procedure below.

1. Unplug or turn the circuit breaker off for 30 seconds.
2. Reconnect the unit to the power source by turning the breaker back on or plugging the unit back into the wall outlet.
3. Press the Pause/Cancel/Stop button twice to clear the display.
4. Start a short cycle to check the operation of the machine by selecting a cycle and pressing and holding the start button until the machine starts


Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

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