Problems after a electric overload

[y0rtx]

Hi,

I have a MeCreator2 and after changing the bed tape for another one which doesn't require heat I disconnected temporary the power suply for the bed in order to avoid over-adherence. After checking that the adherence got worse I reconnected the bed to appy some heat on it without realizing that the printer was switched on. After that, the bed temperature sensor in the lcd panel says the bed is at 90 degrees (even right after switching on), the nozzle burns the pla filament at 180 degrees (It looks like applies much more heat that the indicated in the lcd panel). The real nozzle temperature looks like suming the temperature of the bed and the nozzle one, but . I don't know which piece I have broken/burnt to replace it or how can I search for the source of the problem.

Does anyone know how can I check which part is burnt or broken or any other idea?

Thanks in advance.