Kreston T Enid , OK January 10, 2018 Appliance: Frigidaire Room Air Conditioner LRA12HZU211 Frigidaire Air Conditioner Lra12hzu211: Heater/ air conditioner window unit compressor would not stop running. How to replace Electronic Control Board (Main). I replaced the PC board. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours