LG RC8003C thermistor problem.

Hello.

My LG RC8003C condenser dryer starts giving tE4 error code now and then. When it happens I’ll have to leave for some time to cool down and then it start to work again. Filters and airways are clean, including condenser. According to manual this fault relates to hi temp. thermistor located by heater element. Did check the thermistor at room temperature and it gives circa 2,80 kohm resistance. There is also low temp. thermistor located by front door, but that gives circa 10 kohm reading. Does any one know what sort of resistance they should have? Cheers. Zygi.