UD-35 SERVICE UPDATE FIRST HALF—2009 - Whirlpool
UD-35 SERVICE UPDATE FIRST HALF—2009 - Whirlpool
UD-35 SERVICE UPDATE FIRST HALF—2009 - Whirlpool
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AIR DOOR<br />
During operation (diagnostic step 6), either AC or DC can be measured to ground<br />
(e.g. P6-6) VOM should show 6 to 8 V.<br />
P6 is the Gemini board connector with the WISP connection; it is left side of the top<br />
edge on the board. P6-6 is an empty silo in the lower right corner of the connector.<br />
Since it is empty, it can be a convenient place for a VOM probe. P6-6, and P6-3 just<br />
above it with the BK/WH wire, are DC grounded (which is isolated from AC ground).<br />
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CHECKING THERMISTORS<br />
Thermistor resistance goes down as the temperature goes up.<br />
The display will flash and show 70°F for shorted Thermistors and -10°F for open<br />
thermistors. The “call service indicator will come on”.<br />
To check the accuracy of a thermistor, disconnect it and check the resistance<br />
with the head (not wires) of the thermistor submerged in ice water. The resistance<br />
should be 8700 to 8800 ohms. If the resistance is off by more than 400<br />
ohms, it is inaccurate by 2°F or more and should be replaced.<br />
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