The control board in a Frigidaire refrigerator is the central unit that regulates its cooling and defrost cycles. If this board develops a fault, it can lead to incorrect temperature regulation, ultimately causing the H1 error. This might be due to electrical issues, firmware malfunctions, or damage from power surges. A faulty control board can disrupt the normal functioning of the refrigerator, necessitating a prompt and accurate diagnosis. Ignoring such issues can lead to increased energy consumption and further damage to the refrigerator. For more information on control board related issues, read “Identifying Control Board Issues in Frigidaire Refrigerators.”