Self-diagnostic system for an appliance incorporating an automat

Details Self-diagnostic system for an appliance incorporating an automat Self-diagnostic system for an appliance incorporating an automat

1985-01-17

1986-03-04

Tanner, Harry B.

Refrigeration

With indicator or tester

Condition sensing

62233, F25B 4900

Patent

active

045733252

ABSTRACT:
Apparatus and a method for detecting fault conditions in an automatic icemaker system of the type having an ice forming mold and an electric motor and mold heater which are energized during ice cube ejection cycles. A current sensor monitors current in the icemaker motor and mold heater circuit and generates an "on" signal when current is detected. A microprocessor measures the duration of the "on" signals and the elapsed time between successive of "on" signals. A diagnostic code is displayed signifying a fault condition in the icemaker circuit when the time between successive "on" signals is less than the normal time required to freeze cubes or the duration of an "on" cycle exceeds the normal ejection time. In a preferred embodiment the microprocessor counts each successive occurrence of a shorter than normal time between ejection cycles and displays the diagnostic code after the detection of three successive shorter than normal times between cycles, so as to avoid unnecessarily alerting the user to isolated short fill occurrences.

REFERENCES:
patent: 3480940 (1969-11-01), Lieser
patent: 3511059 (1970-05-01), Hoenisch
patent: 3521264 (1970-07-01), Limon
patent: 3650121 (1972-03-01), Kimpel et al.
patent: 4142373 (1979-03-01), Weibel, Jr. et al.
patent: 4238930 (1980-12-01), Hogan et al.
patent: 4255669 (1981-03-01), Naugle
patent: 4292812 (1981-10-01), Kakinuma et al.
patent: 4307775 (1981-12-01), Saunders et al.
patent: 4387578 (1983-06-01), Paddock
patent: 4426851 (1984-01-01), Neumann

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