1.Turn off the breaker.
2.Disconnect the Shower head.
3.Look and recognize were are parts located before beginning.
4.Unscrew the bolts on top of the unit (8 bolts).
5.Carefully collect each one of the nuts corresponding to each bolt (8 nuts), found under the lower black rubber seal.

6. Disassemble the unit.
7. Change the heating resistance for the new spare part and repeat process backwards, making sure you assemble everything as you took it

apart, tightening the bolts back on just hard enough.
8.Allow the showerhead to fill up with water before turning breaker back on in order to prevent it from seizing.