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Diagnostic system for a fuel-fired water heater

  • US 5,954,265 A
  • Filed: 07/02/1998
  • Issued: 09/21/1999
  • Est. Priority Date: 07/02/1998
  • Status: Expired due to Term
First Claim
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1. Liquid heating apparatus comprising:

  • a vessel for containing a liquid to be heated;

    a heating system operative during a heating cycle to utilize electrical power and combustible fuel from sources thereof to maintain the liquid at a predetermined heated temperature by creating fuel combustion heat and transferring it to the liquid in response to the temperature of the liquid falling below said predetermined heated temperature, said heating system including a series of electrical components successively operative in a predetermined sequence during said heating cycle; and

    a diagnostic system operative to facilitate the identification of a malfunctioning one of said series of electrical components by creating a diagnostic signal indicative of the last component in said sequence to properly function during said heating cycle.

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