it is not the thermal fuse .
If it was the thermal fuse on this model the unit would not start at all .
The three blinking lights means you have an open thermistor .
Mounted on the blower housing.
here is a link to the part.
the Thermistor is located on the front of the blower housing on the front left corner of the unit.
Item number 15 in the link.
I show that E5b is Push button does not function.
Pushbutton held too long or wedged in the control panel.
Press buttons lightly and release. Disengage button if this does not work You willneed to replace the touchpad assembly .
An Expert has NO way to change the value that the customer set on the answer .
And the Code E5b is show on the Service manual for the model number that you have provided AEQ6000ES2 as the touch pad (( all that I did was just copy and paste from Frigidaire Service Manual .