Safety circuit for a heating circuit of a washing machine, dishwasher or drier

(19)

(11)

EP 0 924 331 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	19.01.2000 Bulletin 2000/03

(43)	Date of publication A2:
	23.06.1999 Bulletin 1999/25

(21)	Application number: 98122364.7

(22)	Date of filing: 25.11.1998

(51)	International Patent Classification (IPC)⁷: D06F 39/04

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

11.12.1997 DE 19755089

(71)	Applicant: WHIRLPOOL CORPORATION
	Benton Harbor Michigan 49022 (US)

(72)	Inventors:
	Thumm, Jorge, c/o Whirlpool Europe s.r.l./Pat. Dep 21025 Comerio (IT) Leins, Guenther, c/o Whirlpool Europe s.r.l./Pat. 21025 Comerio (IT) Pöttger, Robert, c/o Whirlpool Europe s.r.l./Pat. 21025 Comerio (IT)

(74)	Representative: Guerci, Alessandro
	Whirlpool Europe S.r.l. Patent Department Viale G. Borghi 27 21025 Comerio (VA) 21025 Comerio (VA) (IT)

(54)	Safety circuit for a heating circuit of a washing machine, dishwasher or drier

(57) The invention relates to a safety circuit for a heating circuit of a washing machine or dishwasher or of a drier, wherein the heating circuit includes a series connection comprising heating switching contact, heating resistor and safety switch, and wherein a monitoring arrangement monitors the heating circuit for faults and, in the event of a fault, causes the heating circuit or the machine to be switched-off. The operational reliability of the heating circuit is easily improved as a result of the potentials at the junctions between the heating switching contact and heating resistor and/or between the heating resistor and safety switch being supplied to a logic circuit which, only when the potential conditions in the heating circuit are correct, issues no fault signal to switch-off the heating circuit or the machine.

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