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Method and circuit for self-checking troubles of a heating system

  • US 5,055,825 A
  • Filed: 01/08/1990
  • Issued: 10/08/1991
  • Est. Priority Date: 09/06/1989
  • Status: Expired due to Fees
First Claim
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1. A method for self-checking and controlling a heating system, comprising:

  • performing first heating system checking steps during a first preheating period, prior to ignition of the fuel for the heating system;

    turning on a water pump and an ignition plug during said first preheating period;

    turning on a fan motor and a fuel pump during an ignition period;

    during said ignition period, performing second heating system checking steps in order to detect error conditions in said heating system;

    if an error condition is detected as a result of said second checking steps, performing an extinguishing step during said ignition period and indicating said detected error condition;

    otherwise if no error condition is detected during said ignition period, performing a first igniting step for the heating system fuel;

    entering a second preheating period if ignition does not occur in said first igniting step, wherein said fuel pump is shut off during said second preheating period;

    performing third heating system checking steps during said second preheating period;

    if an error condition is detected as a result of said third checking steps, indicating an error detected during said second preheating period;

    otherwise if no error condition is detected during said second preheating period, performing a second igniting step for the heating system fuel; and

    performing an extinguishing step if ignition does not take place during said second igniting step.

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