We just went thought a freezing snap. Now everything has thawed but my hayword pump just hums for a few seconds then shuts down for a few minutes and hums again. Is the pump shot? Thanks Dave 12/17/2010

Your pressure washer is either not fitted with a run/stop device in which case like mine you have to switch off within a few seconds of closing the trigger. Check your model features?
The humming noise is the motor stalled out against the pump because there is nowhere for the water to go. The shutoff is caused by the safety overload switching off after overheat.
Or, it has a pressure operated run/stop which is not working. Because water and electricity don't mix, I would suggest getting more specific help. You can download Karcher manuals /spares lists online from Karcher specialists but remember electricity is the silent killer.

I am betting that the water pump is shot. Does it still fill with water now that it is thawed?

Good Afternoon Lori - Thank you for your post! Based on the symptoms you are describing, you may either have a communication error from the main control board or the timer itself may not be operating correctly. If you noticed a humming noise, then once again it could either be a clogged drainage hose or pump that needs to be cleaned, or it could possibly have another issue with the door lock assembly. I would personally contact a professional to accurately diagnose the washer to determine the root cause to reduce the risk of unnecessary parts.

Can you hear the compressor start? If not try the extreme freeze button. Check the condenser is clean and fan working ok.

Yes the pump should turn freely it could be the output shaft bearing or the compressor is out of oil. the best bet is to get a belt that will fit everything but the air compressor this will give you time to find the money to replace the pump and repair the AC systems. by passing the A/C won't hurt anything it will allow you to run it without A/C/ till you can fix the pump.

Your fuel pump is supposed to hum, when you turn the key it primes the system and it will hum. When the car is running the fuel pump is running and it will hum. If the noise is excessive then try a higher quality fuel pump, it may be less noisy. You will hear the fuel pump on a lot of vehicles tho when you are sitting at a stop light with your radio off and everything quiet in the car.

I'm not sure what your humming is much louder than. But if you had a freeze your pump may have froze and you will need to ck for leaks after thawing. You could have cracked your pump or hurt the seals. After you check for this, you can check for a weak start capacitor in your motor, as the cold can affect these also. Good luck.

My first thought: defrost timer which shuts off the compressor and turns on a heater in the freezer is sluggish.  I'd change it out.

Might try unplugging for a few hours and then plug it back in. There is a possibility that it slugged the compressor and there is a restriction in the line. Sometimes when the compressor fails to stop running in cold air the liquid gets back to the compressor. It can cause a bit of gunk to be picked up out of the oil and carried to the expansion line and plug up the line. Maybe turning it off will let the plug fall free and not replug the line. Worth a try anyway.....

quite possibly the drain pump which would cause it to stick in rinse cycle. the humming noise you heard is probably the drain pump powered up but jammed. likely cause is a foreign object stuck in the pump impellor - main culprit is bits of bra wire. take the pump to pieces and extract whatever is jamming it.