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Eberspacher Airtronic M3 D4L ECU Control Unit 12v Applicable fault codes that could require replacement ECU Control Unite following heaters: P000150 Circuit board temperature sensor in the control box defective (voltage too high) P000151 Circuit board temperature sensor in the control box defective (voltage too low) P000152 Circuit board temperature sensor in the control box overtemperature detected P000300 (074) Overheating detection Metering pump hardware or cutout circuit defective P000301 (090) Watchdog reset - Internal error on initialising the control box P000302 (090) Too many watchdog resets P000303 (099) Operating lockout: Too frequent output stage errors P000304 (091) Too many resets (loose contact) P000305 (095) Control box not calibrated P000306 (098) Second cutout circuit is defective P000307 (081) CAN communication error in control unit Suitable for the following heaters: 252955995000 M3 D4L 12v