White-Rodgers Defrost Control Board 24V Universal Replacement

Universal defrost control board for heat pump systems operating at 24 volts, replacing over 200 different control models. Features auxiliary heat lockout, compressor lockout with selectable temperature thresholds, reversing valve shift delay to minimize noise, and adjustable cycle delay (0, 3, or 5 minutes) to protect compressor longevity. Board dimensions are 4-7/10 in wide by 1-3/4 in high by 4-18/25 in long, with auto shutoff when control voltage drops below 16 VAC for more than 4 seconds.