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Defrost diagnostic arrangement for self-defrosting refrigerator appliance

  • US 4,615,179 A
  • Filed: 01/17/1985
  • Issued: 10/07/1986
  • Est. Priority Date: 01/17/1985
  • Status: Expired due to Fees
First Claim
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1. A defrost fault detection arrangement for an appliance having a freezer compartment including a defrost heater circuit which during normal operation is energized by an external source of current during periodic defrost cycles, said fault detection arrangement comprising:

  • current sensing means operative to generate an "on" signal whenever current is sensed in the defrost heater circuit;

    means for measuring the time between successive "on" signals;

    means for comparing the duration of time between said "on" signals to a predetermined reference time greater than the normal time between defrost cycles; and

    means responsive to said comparing means operative to provide a user discernible signal when the time between "on" signals exceeds said reference time.

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