Fault Codes for Eberspacher Heaters
Write down all error codes for troubleshooting. The heater might display multiple codes.
| Fault code | Description | Notes/remedy |
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P000100 (071) P000101 (072) P000102 (073) | Overheating/air outlet sensor – Interruption – Short circuit – Short circuit to the battery (+) | • Check overheating sensor. – Check cables for continuity, short circuit, and damage. – Unplug connector -XB2, measure resistance between cable BU (chamber 1) and cable GN (chamber 2). – In case of deviating values –> renew the heater’s lead harness. |
| P000110 (087) P000111 (088) P000112 (089) | Water/air inlet error– Interruption – Short circuit – Short circuit to the battery (+)Note! Fault code P000110 (087) and P000111 (088) are displayed only if: • heater is in operation • temperature at the water outlet sensor reached at least 80 °C. | • Check the water inlet sensor. – Check cables for continuity, short circuit, and damage. – Unplug connector -XB2, measure resistance between cable BU (chamber 1) and cable GN (chamber 2). – In case of deviating values –> renew the heater’s lead harness. |
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P00010A (051) | Cold blowing – TimeoutThe combustion chamber has not cooled sufficiently for a restart. | • Check whether hot combustion air is drawn in. – If not –> check the flame sensor, see Fault code P000120 (064) and Fault code P000121 (065). |
| P000114 (014) | Possible risk of overheating (implausible signal)Temperature difference between the flame and overheating sensor is too large. Note! Fault code P000114 (014) is displayed only if • the heater is in operation • temperature reached at overheating sensor at least 80 °C. | • For remedy see Fault code P000115 (012). • Check the flame sensor. – Unplug connector -XB4, measure resistance between cable BU (chamber 5) and cable BU (chamber 6). – In case of deviating values –> renew the lead harness of the heater. |
| P000115 (012) | Overheating– Software threshold exceeded temperature at overheating sensor >125 °C | • Check air throughput. • Check overheating sensor: – Check cables for continuity, short circuit, and damage. – Unplug connector -XB4, measure resistance between cable RD (chamber 9) and cable RD (chamber 10). – In case of deviating values –> renew the lead harness of the heater. |
| P000116 (017) | Overheating– Hardware threshold exceeded temperature at overheating sensor >130 °C | • For remedy, see Fault code P000115 (012). • Check overheating sensor: – Check cables for continuity, short circuit, and damage. – Unplug connector -XB4, measure resistance between cable RD (chamber 9) and cable RD (chamber 10). – In case of deviating values –> renew the lead harness of the heater. |
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P00011A (015) | Operating lock-out– Too many overheating events detected. The control box is locked due to too frequent consecutive overheating (Fault code P000114 (014), Fault code P000115 (012)). | • For remedy, see Fault code P000114 (014), Fault code P000115 (012). • Unlock the control box. |
| P000120 (064) P000121 (065) P000122 | Flame sensor– Interruption – Short circuit – Short circuit to the battery (+) | • Check flame sensor: – Check cable for continuity, short circuit, and damage. – Unplug connector -XB2, measure resistance between cable BU (chamber 1) and cable GN (chamber 2). – In case of deviating values –> renew the lead harness of the heater. • Further display Fault code P000120 (064) and Fault code P000121 (065) –> replace the control box. |
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P000125 (057) | Flame cutout from start process Flame cutout within the control range 0%– 25%Flame cutout within the control range25% – 50%Flame cutout within the control range50% – 75% Flame cutout within the control range 75% – 100 %Note! In case of flame cutout during the start phase or in normal operation the heater is restarted (max. 3 times). If the restart was successful, the fault code display is deleted. | • Check exhaust and combustion air systems. • Check fuel quantity and fuel supply. • Check flame sensor: see Fault code P000120 (064) and Fault code P000121 (065). |
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P00012A (052) | Safety time 1– Exceedance | • Check exhaust and combustion air systems. • Check fuel quantity and fuel supply. • Renew the fuel filter. • Clean the fuel filter in the connection socket of the metering pump. |
| P00012B (050) | Operating lock-out, too many safety timeoutsAfter three unsuccessful start attempts the control box is locked. | • Unlock the control box. • Check fuel quantity and fuel supply. |
| P000130 (060) | External air inlet temperature sensor (LEF2)– Interruption | • Test the external air inlet sensor • Disconnect the GYRD / BNWH plug-in connection of the external sensor and measure the resistance value. – If the temperature sensor is OK –> re-connect the GYRD / BNWH plug-in connection. • Disconnect connector XS12/XB12 at the heater and measure the resistance value in connector housing XB12 between PIN 6 and PIN 12. – If an interruption occurs, the ohmic value is > 7175 Ω / > 3 kΩ. • If the resistance value is ok –> replace the control box. |
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P000131 (061) P000132 | External air inlet temperature sensor (LEF2)– Short circuit– Short circuit to battery (+) | • Test the external air inlet sensor • Disconnect the GYRD / BNWH plug-in connection of the external temperature sensor and measure the resistance value, diagram, and table of values. – If OK –> re-connect the GYRD / BNWH plug-in connection. • Disconnect connector XS12/XB12 at the heater and measure the resistance value in connector housing XB12 between PIN 6 and PIN 12. – In the case of a short circuit, the ohmic value is < 486 Ω / < 800 Ω. • If the error P000131 (061) continues to be displayed –> replace control box. |
| P000143 (006) | Air pressure sensor– Implausible signal | • Delete the error and try again. • If error occurs again –> replace control box. |
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P000200 (048) P000201 (047) | Metering pump – Interruption – Short circuit | • Check the metering pump lead harness for continuity, short circuits, and damage. – Lead harness ok –> renew the metering pump. |
| P000202 (049) | Metering pump– Short circuit to the battery (+) or transistor error | • Check cables for continuity, short circuit, and damage. – Unplug the connector at the metering pump. • Display Fault code P000200 (048)metering pump defective –> replace metering pump. |
| P000210 (020) P000211 (021) P000212 (022) | Glow plug– Interruption– Short circuit– Short circuit to the battery (+) or transistor error. Caution! Damage to the unit in case of overvoltageVoltage > 9.5 V irreparably damages the glow plug. Test function with max. 9.5 V.NoteNote the short-circuit withstand capability of the power pack. | • Check the glow plug. – Check cables for continuity, short circuit, and damage. – Unplug connector -XB4, unclip cable WH (chamber 3) and cable WH (chamber 4). – Apply 9.5 V ±0.1 V voltage to the glow plug and after 25 sec measures the current intensity. – Measured value 9.5 A (+1 / –1.5) the glow plug is ok – In case of deviating values –> replace the glow plug. |
| P000213 (019) | Glow plug– Ignition energy too low | • Check cables for continuity, short circuit, and damage. • Test glow plug: see Fault code P000210 (020) to Fault code P000212 (022). |
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P000220 (031) P000221 (032)
| Electric motor– Interruption – Short circuit | • Measure fan speed with EasyScan diagnostic tool: see EasyScan operating instructions. |
| P000223 (033) | Burner motor – BlockingImpeller blocked (frozen, soiled, sluggish, …). | • Remove blockage. – Check the electric motor for smooth and easy running by turning the impeller manually. Note! In the case of the Airtronic D4L 24V, during running heating mode and simultaneous motor start and under voltage of the vehicle battery, in exceptional cases, error message P000223 (033) can occur, although no valid faults exist. • Delete faults using EasyScan and acknowledge them in the control unit on occurrence. • If Fault code P000300 (074) continues to be displayed –> renew fan. |
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P000260 P000261 P000262 | Universal output– Interruption– Short circuit– Short circuit to the battery (+) or transistor error | • Test universal output: test WHRD conductor for continuity, short circuit, and damage. – If cable OK –> replace control box. |
| P000300 (074) | Overheating detection Metering pump hardware or cutout circuit defective | • Test the air outlet sensor. – Check cables for continuity, short circuit, and damage. – Unplug connector XB4, and measure resistance between cable RD (chamber 9) and cable RD (chamber 10). – In case of deviating values –> renew the lead harness of the heater. • Further display Fault code P000300 (074) –> replace lead harness of the heater. • Unlock the control box. |
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P000301 (090) P000302 (090) | Watchdog resetToo many watchdog resets | • Delete errors, the heater remains ready for operation. • Replace the control box. |
| P000303 (099) | Operating lockout: Too frequent output stage errors | • Replace the control box. |
| P000304 (091) | Too many resets (loose contact) | • Replace the control box. |
| P000305 (095) | The control box is not calibrated | • Replace the control box. |
| P000306 (098) | The second cutout circuit is defective | • Replace the control box. |
| P000307 (081) | CAN communication error in the control unit | |
| P00030A | CAN communication error | Delete error. The heater remains ready for operation |
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P000310 (010)
| Control box cutout due to overvoltageHeater cutout due to overvoltageOvervoltage applied at the control box without interruption for at least 20 seconds. Note! The heater is not functioning. | • Unplug connector -XB1 at the heater. • Start the vehicle engine. • Measure voltage between cable RD (chamber 1) and cable BN (chamber 2). – Airtronic 12 volt – voltage > 16 V –> check generator controller – Airtronic 24 volt – voltage > 32 V –> check generator controller – Check the battery. |
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P000312 (011)
| Control box cutout due to undervoltageHeater cutout due to undervoltageUndervoltage applied at the control box without interruption for at least 20 seconds. Note! The heater is not functioning. | • Unplug connector -XB1 at the heater. • Start the vehicle engine. • Measure voltage between cable RD (chamber 1) and cable BN (chamber 2). – Airtronic 12 volt – voltage < 10 V –> check generator controller – Airtronic 24 volt – voltage < 21 V –> check generator controller – Check the fuses, the supply cables, the ground connections, and the positive terminal post at the battery for voltage drop (corrosion). |
| P000330 (092) | ROM error | • Replace the control box. |
| P000331 (093) | RAM error | • Replace the control box. |
| P000332 (094) | NVMEM error (EEPROM, DataFlash) | • Replace the control box. |
| P000342 | Invalid configuration | Check ADR coding. |
| P000394 | ADR button – Short circuit | • Test the ADR button – Check the cables at GYDR / BNWH for continuity, short-circuit and damage – If cables are OK -> replace the control box. |
| P000440 (083) | Timeout, communication with the control unit | • Delete errors and disconnect the heater from the power supply. • If error occurs again –> replace control unit. |