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System and method of fault detection in a warm air furnace

  • US 7,123,020 B2
  • Filed: 06/28/2004
  • Issued: 10/17/2006
  • Est. Priority Date: 06/28/2004
  • Status: Active Grant
First Claim
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1. A system for providing fault detection in an ignition-controlled appliance, comprising in combination:

  • an ignition-controlled appliance having an ignition element, an inducer, and a fan; and

    a sensing circuit operable to measure current consumption of the ignition-controlled appliance, wherein the measured current consumption of the ignition-controlled appliance depends on whether the ignition element, the inducer, and the fan are activated, and wherein the measured current consumption is used to diagnose an AC load failure in at least one of the ignition element, the inducer and the fan in the ignition-controlled appliance.

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