Question

a heat pump should go into the defrost mode if an ice build - up
o is visible
o is more than 1/32 inch thick
o is more than 1/8 inch thick
o is more than 1/4 inch thick
o is more than 1/2 inch thick

Explanation:

Typically, a heat - pump should enter defrost mode when ice build - up is more than 1/8 inch thick to ensure efficient operation and prevent damage.

Answer:

is more than 1/8 inch thick