TroubleShooting basics: electrical control (STC controlled operators) January 29, 2020 20:54 Updated Related articles TroubleShooting basics: electrical 1 (STC controlled operators) TroubleShooting basics: electrical power (STC controlled operators) (AL12) alert 12: on too long (ALE2) alert 2: gate drift close (ERR2) error 2: IES Disconnect