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Which wire goes to which end of diode (fuse)

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Attached to gray case containing control circuit board (shot, heater relay burned hole in circuit board) is a ceramic part

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Old 05-27-2010, 06:51 AM
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Arrow Which wire goes to which end of diode (fuse)
Model Number: GU1500xXTKB0   Brand: Whirlpool   Age: 5 - 10 years   

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Attached to gray case containing control circuit board (shot, heater relay burned hole in circuit board) is a ceramic part with two posts attached. Is this a thermal fuse or is it a current fuse? . I am not an expert, but this piece appears to contain a diode (one end pointed and green. ) One wire attached is black and the other, going to door switch, is black and white. In removing leads I did not pay attention to which lead went to which post. Does this part have an electrical direction and if so which wire goes to which lead? Also, if this is a thermal fuse, is its purpose to cut power if circuit board overheats or catches fire?
Thanks.


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Last edited by materman : 05-27-2010 at 09:14 AM. Reason: clalrification as to whether thermal or current fuse
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  #2 (permalink)  
Old 05-27-2010, 10:57 AM
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The item is a thermal fuse but they will also blow with excessive current.
There is no positive or negative so the polarity does not matter.

It is important that you also use the new harness which comes with the fuse.
Part number: AP3178588

Part number: AP3178588
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Old 05-27-2010, 01:23 PM
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The original fuse did not blow when heater relay failed.. Is it okay to install original fuse back by "clipping" fuse into gray box containing new control board? Is there a reason to replace fuse and wiring harness when new control board installed. I ordered control board, but not a new fuse with wires as original still works.
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Old 05-28-2010, 02:16 AM
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You could use the old fuse.

But if it blows then you should replace the fuse and the harness.
The reason the harness is part of the kit was that the fuses were blowing without there actua;lly being a fault.
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Last edited by denman : 05-28-2010 at 03:12 AM.
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