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Whirlpool portable dishwasher hums, doesn't run


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7 replies to this topic

#1 Urby

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Posted 30 June 2005 - 08:22 AM

I have a Whirlpool portable dishwasher, model #SHF5884P0, that was working, and then recently, just hums/buzzes when you pull out the knob to start the cycle.

Since the buzzing was coming from the front panel, it seemed to point to the timer circuit box. However, the wiring diagram that is SUPPOSED to be on the kick panel is not there (it is a dishwasher from the 70's!), so I can't really check the timer circuit box itself.

I did check the resistence on the wires from the plug, and 3 of them had a reading of 0.3 - 0.6 ohms. All others read 0 ohms.

So the questions are:
How can I get a hold of a wiring diagram?
How large of an ohm reading necessitates replacement of the wires?
Is there anything else I should look into?

Thanks for any suggestions you guys might have.
Urby

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#2 Pegi

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Posted 30 June 2005 - 08:56 AM

Is it filling with water??? 
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#3 Urby

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Posted 30 June 2005 - 09:38 AM

No, it is not filling with water.

I set the cycles, turn the knob to start, and pull out, and I just get a humming/buzzing noise.

Urby

#4 Pegi

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Posted 30 June 2005 - 10:03 AM

You could be hearing the fill valve humming or the motor making this noise.  Seems you need to check why no water is entering.  Without water this will do nothing but hum. Could be a bad fill valve or the float switch is not feeding the valve. Make sure the float in the tub is down, it if is stuck up you will get no water. I assume the faucet was turned on.
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#5 Urby

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Posted 30 June 2005 - 06:05 PM

The float switch is down, but in this dishwasher, it's just an overfill signal switch, so it doesn't enter into consideration for the fill segment.

The water inlet valve tests correctly at about 700 ohms.

The humming/buzzing is definitely coming from the front panel, centered on the timer circuit. It is not the motor.

Thanks for the suggestions so far.

Urby

#6 Pegi

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Posted 30 June 2005 - 06:43 PM

The flood switch always enters into consideration for filling any dishwasher. On all dishwashers this is a flood switch, if the unit gets too full of water the float will rise and come up off of the switch under the tub.  If the float were stuck up or the switch under the tub this pushes on is bad, there would be no power to the valve. If the buzzing is coming from the console do not know what you have going on.
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#7 Urby

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Posted 04 July 2005 - 05:31 PM

This is why I'm still a grassphopper ...

Tested the float switch, and sure enough, it tested bad (open circuit when down, no resistence when up).

We'll see what happens now.
Thanks for pointing me in the right direction.
Urby

#8 Pegi

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Posted 04 July 2005 - 06:32 PM

Thank you for the reply, let us hope a new flood switch will resolve your no fill problem....Pegi  ..;)
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