Ran 1600s washer without water.

Sharon, you first should make sure you have no connection/leaks any where. There is a pressure switch inside the pump, which controls when the motor turns on and off. Leaks in pressure causes the pressure switch to activate the motor. Leaks are the biggest contributor to a cycling machine. If no leaks, the pressure switch is defective. Check the attached links,instruction and guides, Good luck
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Karcher North America Home Garden Online Help
Frequently Asked Questions about Pressure Washers
Common Pressure Washer Repair Problems Pressure Cleaned

It is possible that presence of moisture within the START button can trigger the cycle to continue as it keep the processor to continue the wash cycle,Hence you must remove the panel and board after disconnecting the wiring harness and use a hair dryer to warm off any presence of moisture on the panel and board. Do it with time to ensure there is no moisture within the panel.
I think this must solve the issue. Repeat the work many times as sometimes moisture and dirt together might form a conductive bond to trigger as a pressed on switch. If possible open panel to clean switch pad.

You shouldn't let the washer run for more then 30 seconds without spraying. If you let the motor run without squeezing the trigger, the pump will overheat and damage the motor. You may also need to change the spark plug and clean/replace the air filter.

Whar has happened is that your unloader / bypass valve is sticking. This is due to minor corrosion and having water in the unit over the winter. Most of the time they will sanp out it if you do the following:

Add 3 - 4 oz of oil into the water supply connection and briefly and I mean very briefly switch on the unit then right back off. Add more oil to the water supply connection and then let it sit overnight.

Then next day turn the unit on briefly and let it sit another 30 minutes. After this you connect all hoses making sure to purge the air our of the supply hose BEFORE you connect the to the unit. Then once you turn the unit on rapidly trim cycle the wand trigger. Your goal here is to cause a water hammer of the unloader / bypass valve to get the spring and cupped seal to move in the housing. Pause briefly and see if pressure builds then fan the wand trigger again. This can take a few minutes to get it to work but the routine of pausing waiting momentarily and rapidly tripping the wand trigger is what should get the unit going again.

If this does not work you will have to take the unit apart dis-assemble the unloader / bypass vavle on the output side of the pump and remove the corrosion on the spring and the housing.


Once your done cleaning up the bypass unloader valve before you put it back in the housing place a liberal amount of Lubriplate #105 White Grease on the spring and inside the housing on the mating surfaces. (#105 white grease is available at any Auto Parts store. It is in a 3 - 5 oz plastic tube)

Re-assemble the unloader / bypass valve an it should work like a champ.

Thanks for choosing FixYa.

Kelly

Before you do the below steps check the water supply inlet screen for obstructions where the water hose connects to the unit. If you notice debris remove and clean the screen under running water with a small NYLON brush.

The bypass unloader valve is triggering earlier than it should. You can lubricate this by adding oil to the water supply inlet (at least 3 oz.) and very briefly switching the unit on then off 0.5 seconds. Then let is sit overnight. The next day connect power briefly and again cycle the unit on then off for 0.5 seconds. Connect the water supply and then purge the water wand hose into a bucket to catch the oil before use. After this restart the unit and operate the wand trigger under full pressure at 0.5 second intervals to ;scycle the bypass / unloader valve inside the pump. This method has worked in about 95\0 % of the machines I have worked on. The oil lubricates and fattens the seals in the bypass / unloader valve. It eihter works the first time or the seals are torn in the unloader valve and must be replaced. With only 3 uses I think your pretty much in the clear and will not need new seals.

Thanks for using FixYa.

Kelly

Hi Brian. Welcome to FixYa I am Kelly. This sounds as if the bypass / unloader valve is stuck in place and the pump id dead heading causing the unit to shut off. (There is most likely some corrosion in the unloader / bypassy valve assy / housing. What you can try is pouring at least 3 oz of oil into the water inlet assy and briefly.... like VERY briefly switch the unit on then back off. Then let it sit over night. The next day connect everything for normal use then turn the unit on again briefly. Use a bucket to PURGE the oil that you put through the system by squeezing the wand Power SW Off until the oil purges. Then switch the unit on and rapidly trip the trigger at 0.5 sec intervals or less. If it trips off wait 5 mins and try it again. Do the rapidly tripping the trigger on the wand routine for about 20 seconds. Your forcing the bypass unloader valve to cycle trying to clear out any debris / corrosion.
This works often and well. There are exceptions. Hopefully it will work for you.

Thanks for using FixYa.

Kelly

pump is out

Got gas?

Disassemble and clean the carb. If it ran briefly with the starer fluid then gasoline is not coming through the carb.

Unplug the washer and wait 30 minutes, sometimes the next morning for the machine to reset. Make sure the water is on because it while find multiple failures and lock up, Secondly you can try putting the machine into diagnostic cycle to ensure it is ok. Press drain/spin and select no spin for spin speed finally press prewash quickly two or three times and let it run, any flashing codes?, hit prewash again after writing the codes down.