Hotend temperature 736 - real zero

Hi guys,
I have problem again . I use this heater 12v 40W Heater Cartridge. After cleaning printhead and reassembled it I started Pronterface and started warm up hotend with bed. After a few seconds my eyes stared at hotend temperature 736. I disconncted printer from electricity and checked nozzle.
No warm on it. Does anyone know what happened ? I just cant warm up hotend now. My multimeter merged 4,2 ohms.

Edited 1 time(s). Last edit at 05/04/2014 04:34PM by Arnold.

Check the thermistor. If it is shorted out, then it might read at the top end of the thermistor table.

Ok, I measured on thermistor 1.0 with multimeter, is it shorted ?

The thermistor should have about 100kOhm @ room temperature. If it doesn't it is defective.

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Ok, so Iam gonna buy new one and try it...