hakko 936 not heating up

[rem]

hello,
i have a problem with the hakko not heating up.
i replaced the heating element a few weeks ago and it worked fine.
today it does not work. i bought the heating element fro aliexpres.
i searched what things to check and found in a video that the value of resistance of the heating and the sensor should be below 10ohm in  my case
the heating element is 12.5ohm and O.L on the sensor.
is that mean the heating element is bad?
tnx in advanced

[magic]

Yes, it's bust. The heater should be a few ohms, the sensor is supposed to be around 100Ω depending on temperature. Perhaps its cable broke?

https://www.eevblog.com/forum/reviews/genuine-vs-fake-hakko-936-ceramic-heater-a1321/msg239393/#msg239393

Beware that there are non-compatible heaters for knockoff stations which won't work in genuine Hakko. Use only A1321 types.