20000 Btu Air Conditioner - Blogs & Forums On Electric Air Conditioning System

Blog Title: Air Conditioners Freezing Problem

Main Que: Why is my HVAC unit freezing up?

  • Category:
  • Query By: NINA H (Seattle, WA)
  • Date: 03/23/2016

Answer: "There are lots of possibilities that can cause your HVAC system to freeze up. Yet it’s recommended to be corrected by a professional technician. Though, determining the air filter is clean or replaced and make sure the airflow is not restricted or about the only tasks a homeowner should safely identify or handle themselves. Some Factors… Low refrigerant, Dirty evaporator coil, Defective blower motor or relay. In few cases, freezing up is initiated by a leakage in the refrigerant lines. Due to friction from piping rubbing or vibrating against an object, leaking valves, weak solder joints, or loose fittings can cause leaks. The length of time your system has been installed and the nature and location of the leak are the determining factors on whether to have the system repaired or replaced. The evaporator coil will become dirty. On these occasions, the results are similar to those of having a dirty filter. Gradually you will lose airflow, slowly enough that you probably would not realize it until it freezes up or is not cooling adequately. You will need to call to remedy the problem. A blower motor running at an improper speed or not running at all can cause freezing. It can also be sporadic, starting at full speed and slowing down after it heats up. Or a relay could cause it to start one time and not the next. In either case, you will need to contact to correct the problem. "

  • Replied By: DAVE ACOSTA (Jacksonville, FL)
  • Replied Date: 03/30/2016