Patent claim: Method according to any of the previous claims wherein the temperature sensor adapted to detect the refrigerant temperature Tr of the heat pump system 44 is arranged at one of the following positions of the heat pump systeman outlet of the first heat exchanger 32 for detecting the refrigerant temperature Tran outlet of the compressor 36 for detecting the refrigerant temperaturethe compressor 36 for detecting the compressor temperaturethe second heat exchanger 34 for detecting the refrigerant temperature oran expansion device 38 arranged between the second and first heat exchanger for detecting the refrigerant temperature.

Related passage: According to one aspect of the present disclosure there is provided a laundry andor tableware treating machine including a treating chamber where the items can be introduced to be treated with a treating medium a control unit UC1 a heat pump system including a compressor C a first heat exchanger for heating a refrigerant a second heat exchanger for cooling the refrigerant and heating the treating medium and expansion means at least an active switching device RL controllable by the control unit UC1 for selectively switching ONOFF the compressor C wherein it further comprises at least a passive switching device not controllable by control unit UC1 and including a thermo protector circuit P adapted to cut the power supply to the compressor C when predetermined temperature or voltage load or current thresholds are exceeded monitoring means to detect the opening of the thermo protector circuit P to cut the power supply to the compressor C wherein the monitoring means includes at least one of the following a system for monitoring the temperature of the refrigerant a sensing circuit to detect a change of potential andor current at an assembly comprising the compressor C and the thermo protector circuit P.Preferably control unit UC1 is adapted to implement a corrective action in response to the activation of the thermo protector circuit P being detected the corrective action includes atleast one of the followingswitching ON a compressor cooling fan adjusting an upper threshold temperature of the refrigerant for driving the switching ON of compressor cooling fan adjusting a lower threshold temperature of the refrigerant for driving the switching OFF of a compressor cooling fan adjusting the rotational speed of a compressor cooling fan adjusting an upper threshold temperature of the refrigerant for driving the switching ON of fan for cooling an auxiliary heat exchanger of the heat pump system adjusting a lower threshold temperature of the refrigerant for driving the switching OFF of a fan for cooling an auxiliary heat exchanger of the heat pump system adjusting the rotational speed of a fan for cooling an auxiliary heat exchanger of the heat pump system modifying a safety threshold temperature of the refrigerant at which the control unit switches OFF the compressor C via the active switching device RL.adjusting the rotational speed of a fan adapted to circulate the treating medium through the treating chamber adjusting the rotational speed andor the rotation direction of a motor adapted to drive into rotation the treating chamber particularly reducing the time period of the treating chamber inversion rotation adjusting the rotational speed of a compressor electric motor.