Question about Karcher 2500 PSI Pressure Washer

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Spill valve where is spill valve

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Spill valve is probably the valve that releases excess pressure or heat caused by not using trigger while machine is running. allowing the water the escape onto the floor

Posted on Apr 21, 2014

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Posted on Jan 02, 2017

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Hope u can help when the karcher is conected up and the trigger on the handle is not depressed the machine makes a noise like its trying to presureise the hose it keep kicking in and out i have lost the...


The power washer stops when the gun is closed. This happens because pressure is exerted on a control valve (Spill Valve)...which in turn touches a micro switch and cuts electricity. Now most probably your machine is kickin in an out because the spill valve got faulty This happens when one stores away the machine with pressure still in it. NEVER store a power washer with pressure in it. The spill valve also gets faulty because left with soap and machine not rinsed. I rarely service spill valves...I change with a new one.
To locate the spill valve open cover (using a TORX T15screw driver)...and where you see 2 wires coming out...there is the spill valve.
Sometimes these machines have the spill valve incoporated with the head....in that case the whole head must be renewed. I also wish to tell you to try using the machine with out the lance. If all works good...then the on and off could also be comming from a faulty nozzel.
Regarding the Spill Valve...when it gets faulty...the machine also lose pressure. So in your case it is most likely that the spill valve is faulty.
Regards,
Fulltech.

Apr 14, 2011 | Karcher K2.26 Electric Power Washer

1 Answer

No power when switched on new switch fitted


Dear Sir,
The power washer stops when the gun is closed. This happens because pressure is exerted on a control valve (Spill Valve)...which in turn touches a micro switch and cuts electricity. Now most probably your machine is dead because the spill valve is stuck down and closing the micro switch. This happens when one stores away the machine with pressure still in it. NEVER store a power washer with pressure in it. The spill valve also gets gammed because left with soap and machine not rinsed. I rarely service spill valves...I change with a new one.
To locate the spill valve open cover (using a TORX T15screw driver)...and where you see 2 wires coming out...there is the spill valve. If you can manage to do this..you can try if you want to lubricate it by spraying SILICON spray. If you get it out..you use silicon grease.
Sometimes these machines have the spill valve incoporated with the head....in that case the whole head must be renewed.
Regards,
Fulltech.

Apr 11, 2011 | Karcher K2.26 Electric Power Washer

1 Answer

On high pressure it pulsates


First you have to do is try the machine without load. Attach everything as usual but do not attach the lance. Put on machine with water supply already on. If you close the gun the machine should stop. If you open the gun ( always with out lance)....the machine should start sending the water a bit far. If this is OK....then you have a lnance with a faulty, blocked NOZZEL.
NOrmally the machine stops when gun is released because there is a valve (Spill Valve) that actuates a electrical micro switch. This in turn closes off te electric supply...stopping the machine.
If with out lance your problem is still there....then the spill valve is faulty and the machine starts pulsating. AS I first said you must be sure that the nozzel is OK, so that you can blame the Spill Valve. When the spill valve is faulty the machine pulsates at high pressure.
I raely service Spill Valves (Control Valves). I change with a new one. When open the cover using a TORX T15 screw driver....you locate the spill valve where there are 2 wires coming out. Some machines have the spill valve incorporated with the head and the intake and delivery valves unit. This I advize to change with new parts. These all in one heads are very good because at one go you change the spill valve and the other valves in one go.
Therefore in a few words you either have a blocked nozzel...or you have the spill valve faulty.
So I advice again to try the machine with out the lance. If when gun is closed machine stops and stays that way ..it means the spill valve is doing its job. If when putting back the lance and the pressure starts to pulsates...the lance nozzel is faulty and thus causing simptyms on the spill valve. Also try to use machine with a new lance...having a new nozzel.
Fulltech.

Feb 18, 2011 | Karcher K2.26 Electric Power Washer

1 Answer

Motor does not shut off when trigger on wand is released


When the trigger is released, pressure builds up and this acts on a valve (spill valve or pressure control valve). When this pressure is big enough it will push the spill valve out and closes a micro switch. Now this Spill Valve gets stuck sometimes, mainly due to soap and chemicals...so the micro switch is not closed...so the machine contiues running. If this is left likee this it will cause damage to the valves. So all one has to do is service the spill valve or as I usually do I replace it. There are cases were the micro switch is damaged also..and needs to be replaced. To see the spill valve and micro switch you must open the cover. The spill valve is located where you see a cover with an electric wire coming out of it. If the micro switch is good...you must tackle the Spill valve.
Regards,
fulltech.

Jul 17, 2010 | Karcher PSI Electric Pressure Washer

1 Answer

I have a Karachr 3.91M pressure Washer that cycles on and off


Dear frank_perra,
The spill valve is nearly always found near or under the micro-switch. If the 3.91M has its head in 2 parts....then the spill valve is incorporated with the top part of the head. In general,...machines that have the head in 2 plastic parts...the top part has the spill valve and the bottom part has the valves. Such machines it is not advisable to service the spill-valve. In these cases the whole top part is changed. This top part often contains the inlet-valve for the chemical. Care must be taken because this Chemical valve must be used again. Infact under this chemical valve you find the spill-valve unit. Then, as I said under the spill-valve unit you find the electrical micro switch. There are various other parts which are reusable when changing the upper head unit.
In other models you can change only the spill valve and not the whole head. As a rule....you always find the spill-valve where it is activating the micro switch, which stops the machine when the gun is closed. A faulty spill-valve will also result in low-pressure.
Regards,
Fulltech.

Jul 29, 2009 | Karcher K2.26 Electric Power Washer

1 Answer

Karcher 3.97M Short cycles after trigger is released.


Dear csdamman,
There is a valve called the spill-valve. It is often called the control valve. This valve activates the micro-switch. When the gun is released, pressure builds up and compresses this spill valve. At the same time it puts off the micro-switch. This will then stop the machine. Now when the spill valve is faulty it cannot hold compreesion under pressure so it starts de-compressing and starts the machine again. This goes on in a cycle as you explained. So you have to change the spill valve. If the spill valve that operates the micro-switch is part of the upper head,...then the whole head must be renewed. Myself I rarely service Spill Valves. The best thing is to renew it. From your explanation it seems that you did not take notice of this Spill-Valve. Infact when you mentioned Pressure Switch, I do not know if you are refering to the spill valve. If you are....then saying that the Pressure Switch moves and operates freely, does not mean that it is OK.
In certain machines in the outlet...there is a small valve, coloured black and red or green and yellow. This sometimes when faulty, it gives the fault you mentioned. Sometimes an inlet valve gives the fault you mentioned. But from my expirience it is most of the time that the Spill-Valve is the fault.
Regards,
Fulltech.

Jul 21, 2009 | Karcher PSI Electric Pressure Washer

1 Answer

Motor starts and stops continually


Dear loliver2,
When trigger is shut, pressure builds up in machine and this activates a control-valve or often called a Spill Valve. This Spill Valve compresses with the built up pressure and switches off a micro-switch...which in turn stops the machine. Now when this Spill Valve gets faulty, it starts compressing and de-compressing undr pressure. Thus the micro switch is activated on and off. That is why your machine is starting and stopping. Now this Spill Valve also controls pressure. So to fix the fault you must change the Spill Valve with a new one. Myself I rarely service Spill Valves. You can locate the spill valve after you open the cover. The spill valve is usually covered with a plastic cap that contains the electrical micro switch. I do not know what model you have....but sometimes to improve the pressure you must also change the suction and delivery valves. But in most cases like yours...it is only the Spill Valve that is causing the starting and stopping and the low pressure.
Regards,
Fulltech.

Jul 16, 2009 | Karcher K2.26 Electric Power Washer

1 Answer

Auto shut off when trigger released does not activate


Dear rbaker2,
Auto shut off is carried out by means of a spill valve or also know as a control valve. When the gun is closed, pressure is built within the machine and within the spill valve. With the pressure the spill valve is compressed and pushes on a microswirch. When this is done the microswitch shhuts the machine down. Now your problem is caused by one of 2 faults. Either the spill valve is faulty or the micro swithch is faulty. Most machines it is the spill valve which mostis the fault. But microswitches are also delicate and also get faulty. A rare reason for your problem is that both the spill valve and the micro switch are faulty. The spill valve and the micro swith, is rarely serviceable. So I advice you change the two of them by new ones. A bit of advice do not leave the machine running with closed gun ...because this as I said builts pressure in the machine and damage is done to internal suction and delivery valves. Sometimes even the high pressure hose can burst. These results can also hurt a person. If you open the machine yourself you often locate the spill valve under a cap with a micro switch and you see a black wire attached to the cap. If you intend to use the old spill valve, this must be lubricated with special silicon grease. The job is very simple. All you have to do is open the cover and locate the spill valve.
Regards,
Fulltech.

Jun 25, 2009 | Garden

1 Answer

Pressure washer lacks pressure initially?


Dear allbusiness9,
This problem is most probably due to a faulty Spill Valve( also called Control Valve). When the gun is released the spill valve is compressed and it either closes a micro switch or just opens from the bottom and keeps the water circulating. All spill valves keep the water circulating from the bottom part. Now when the gun is pulled (opened)...the spill valve extends and closes the bottom part, and thus water goes out of the nozzel. When you work with no nozzel, there is enough water flow to close the bottom part of the spill valve. So when the nozzel is placed back there is no chance that the bottom part leaks water. When the gun is started with the nozzel....the bottom part of a FAULTY spill valve,..will colapse and pressure drops. So to fix the fault you must change the Spill Valve. In some occasions, I also found that suction valves give this problem. A faulty sucktion valve will colapse under high pressure, and lets water pass the other way round.
But in my opinion and experience, your problem is in the Spill Valve.
Regards,
Fulltech.

Apr 23, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

I have a Karcher K3.97 pressure washer. I think I'm losing pressure somewhere because the motor surges on and off every few seconds. No obvious leaks though. Could there be an internal leak through a...


Dear Sir(s),
The majority of power washers have a spill valve or sometimes called a Control Valve. This spill valve will contract when the gun is closed. As it contracts it switches off a micro switch. Also at the base of the spill valve, an opening opens to let water circulate. Now if this Spill Valve is defective, it will make the machine lose pressure and it will make the machine switch on and off also. I sometimes service the Spill valve and lubricate with special Silicon grease. But if the end of the Spill Valve is not closing correctly, then I suggest that the Spill Valve be renewed. To come to see the Spill Valve, you have to open the cover. Most probably you see wires or a thick wire attached to the head. The part attached to the head contains the micro-switch. Remove the Miro-Switch holder and then you might see screws holding the jammed or faulty spill valve. If you cannot pull the spill valve out, try attaching water and sometimes you can switch on the machine for a second...and with the pressure,...the spill valve will be spitted out.
The switching of ON and OFF due to a faulty Spill Valve, will for sure damage the capacitor. A damaged spill valve gives all these symptoms. Machine going on and off while gun closed and while gun opened, and added to these,... pressure gets less. One small other hint....if all is OK with the machine, and when spraying the machine goes on and off....this is due to a blocked nozzel.
Regards,
Fulltech.

Aug 04, 2008 | Washing Machines

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