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Eberspacher Espar Airtronic AM2 D4 R 12v Electronic Control Unit ECU Genuine Eberspacher Espar warranted repair part For latest Eberspacher Airtronic M2 D4R 12v heater versions Technical support and additional products available from Butler Technik Suitable for the following Airtronic heater versions 252746995000 - Airtronic M2 D4R 12v Please note - 12v only Applicable fault codes that could indicate Electronic Control Unit fault - further investigation always required. P000110 (087) - Air inlet error - Interruption P000111 (088) - Air inlet error - Short circuit P000112 (089) - Air inlet error - Short circuit to battery (+) P000120 (064) - Flame sensor - Interruption P000121 (065) - Flame sensor - Short circuit P000131 (061) - External air temperature sensor - Short circuit P000143 (006) - Air pressure sensor - Implausible signal P000301 (090) - Watchdog reset 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