Fault detection: as shown in the image above. Disconnect the air conditioner power supply, pull off the plug on the terminal of the temperature control unit, and measure the temperature control device, which is still in the control of the fault.

The cream of the thermostat shape is shown. In addition to the air conditioner. It has two temperature sensing tube, of which a temperature sensing tube installed in the outdoor air inlet and sense the outdoor environment temperature TL; another temperature induced tube at the end of a temperature sensing bag tightly fixed on the outdoor heat exchanger, perception of the outdoor heat exchanger temperature T2. The double temperature tubes except Frost temperature controller and temperature sensing tube except Frost temperature controller of the biggest difference is: the former disconnection point and the turn-on point is dynamic, i.e. t (except cream thermostat breakpoint temperature) is not a constant, t change with the temperature difference between T1 (outdoor ambient temperature) and T2 (the temperature of the outdoor heat exchanger) and their changes. In addition to frost the thermostat contacts disconnect is an important condition for: when the outdoor heat exchanger temperature T2 is lower than 0 DEG C, and delta T (] t=t1-t2) in more than a few degrees, in addition to the cream of the thermostat contacts to disconnect. If a t=0 C or delta T is very small, even if the T1 is t2<-10 DEG C, in addition to contact frost thermostat is not disconnected. If T1 and T2 does not exist difference, also there is no heat exchange, the outdoor heat exchanger is not frost, nor indoor heating. Since the air conditioner can produce a very thick cream, indicating the presence of the temperature difference between the temperature and the temperature of the contact of the cream, and in addition to the temperature control device can not be disconnected, indicating that in addition to the Frost temperature controller has been damaged. In addition to the temperature of the thermostat contact can not automatically disconnect the following three cases:

(1) in addition to the temperature of the air leakage of the air temperature inside the tube.

(2) in addition to the mechanical properties of frost thermostat changes, the temperature changes, the temperature increased t.

(3) in addition to the adhesion of the Frost temperature regulator contact.

Regardless of the damage to the temperature control device, which is the case, need to be replaced. Replace a same size, model of the addition to the cream of the temperature control, troubleshooting. If there is no temperature control device with double temperature tube, it can be replaced by the single temperature tube of the addition of cream.