Defrost heater is covered by freezer air duct, you need to disassemble and remove freezer air duct to check.
Remove freezer shelf.
Lever 2 screw covers off.
Step 3
Unscrew 2 screws.
Remove air duct:
a. Hold the decorative cover of air duct;
b. Pull air duct out;
c. Disconnect the terminal of fan motor;
d. Take air duct away.
Check if wire is broken.
Disconnect the terminal of heater.
Use 6mm cross-head driver to unscrew on left and right.
Lift evaporator and heater 20mm, the bottom must be higher than the edge of the trough.
WARNING:
Be careful not to deform pipes in red square during steps 4 & 5.
Loosen the clips for fastening heater. There are 8 clips in total.
Remove the heater.
Reverse the above process to reinstall the heater.
Reverse steps above to replace the heater.
After pushing air duct back into position, you should hear a clicking sound. If there is no click, please repeat again.
If gap is large, re-install air duct.