When testing a diode you need to lift one end of the component to prevent a second path of continuity. If you lift one end, and you have continuity in both directions when reversing the polarity, it would be shorted or defective. Does your Fluke have a Diode or Semiconductor setting? This will show you the voltage drop for the N/P junction which will be a better test than using the Ohm setting. If the diodes check good, test the motor windings, switch and heating element.
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