(NCCER) National Center for Construction Education and Research Certified Handyman Practice Test
(NCCER) National Center for Construction Education and Research Certified Handyman NCCER Maintenance & Repair
What is the most common cause of HVAC system failure?
Select your answer
A
Clogged filters and poor maintenance.
B
Lack of refrigerant.
C
Excessive refrigerant.
D
Broken air ducts.
Need a hint?
(H)