Fault Codes for Eberspacher Heaters
Write down all error codes for troubleshooting. The heater might display multiple codes.
| Fault code | Fault description | Fault Code Remedy / Solution |
| 000 | No faults | – |
| 004 | Warning: Short circuit in the control box, fresh air output | Disconnect connector S1 / B1 at the heater and at the connector B1, PIN 16 check the cable up to the fresh air fan relay for a short circuit to negative, if ok –> replace the control box. |
| 005 | Warning: Short circuit in the control box, car alarm output | Disconnect connector S1 / B1 at the heater and at the connector B1, PIN 15 check the cable up to the relay isolating switch or the car alarm input for a short circuit to negative, if ok –> replace the control box, |
| 009 | ADR shutdown | ADR shutdown due to signal change from (+) to (–) at connector S1, PIN 13 (D+) or plus signal at connector S1, PIN 14 (HA+). |
| 010 | Overvoltage cutout | Overvoltage applied to control box for at least 20 seconds without interruption – The heater not working. • Disconnect connector S1 / B1 at the heater, start the vehicle’s engine, measure the voltage at connector B1 between PIN 1 (cable 2.52 rt) and PIN 10 (cable 2.52 br). AIRTRONIC L 12 volt – voltage >16 volt —> check generator regulator. AIRTRONIC L 24 volt – voltage >32 volt —> check generator regulator. |
| 011 | Undervoltage cutout | Undervoltage applied to control box for at least 20 seconds without interruption – heater not working. • Disconnect connector S1 / B1 at the heater, the vehicle’s engine is switched off, measure the voltage at connector B1 between PIN 1 (cable 2.52 rt) and PIN 10 (cable 2.52 br). The measured value and the voltage at the battery should be the same. In case of a voltage drop, check the fuses, the supply cables, the negative connections and the positive support point on the battery for corrosion and correct contact. |
| 012 | Overheating at the overheating sensor (combination sensor) | The temperature of the overheating sensor is too high. • Check hot air pipes for blockage –> remove the blockage. • Sum of the component ratings of air-conducting parts is too large –> Check air system, if necessary re-lay – for component ratings, please refer to additional parts catalog. • Check overheating sensor If ok –> measure fuel quantity. |
| 013 | Overheating at the flame sensor (combination sensor) | Flame sensor signals temperature at heat exchanger is too high. • Check hot air pipes for blockage –> remove the blockage. • Sum of the component ratings of air-conducting parts is too large –> Check air system, if necessary re-lay – for component ratings, please refer to additional parts catalog. • Check flame sensor, if ok –> check overheating sensor, if overheating sensor defective –> replace combination sensor, if overheating sensor ok –> measure |
| 014 | Temperature difference between flame sensor and overheating sensor too large | The temperature difference between the flame sensor and overheating sensor is too large • Check hot air pipes for blockage –> remove the blockage. • Sum of the component ratings of air-conducting parts is too large –> Check air system, if necessary re-lay – for component ratings, please refer to additional parts catalog. • Check flame sensor, if ok –> check overheating sensor, if overheating sensor defective –> replace combination sensor if overheating sensor ok –> measure fuel quantity, if fuel quantity ok –> replace control box. |
| 015 | Operating lock-out | The fault code 015 is displayed, if the heater was switched back on after the fault code display 017. The hardware threshold value for the overheating sensor has been exceeded –> the control box is locked. • Switch off the control box. |
| 017 | Overheating | The hardware threshold value for the overheating sensor has been exceeded, because the control box failed to recognize the fault code 012 or 013 –> the the control box is locked. If the heater is switched on again, the fault code 015 is displayed. • Switch off the control box. |
| 020 | Glow plug – interruption | • Check glow plug is working and for continuity. 12-volt heater – approx. 0.6 Ω ± 0.04 Ω (heat resistance) 24-volt heater – approx. 2 Ω ± 0.2 Ω (heat resistance) • If the values of the continuity test and functional test are ok –> check the glow plug’s lead harness for damage and continuity, if ok –> replace control box. |
| 021 | Glow plug output (–), overload or earth short circuit | • Check glow plug is working and for continuity. 12-volt heater – approx. 0.6 Ω ± 0.04 Ω (heat resistance) 24-volt heater – approx. 2 Ω ± 0.2 Ω (heat resistance) • If the values of the continuity test and functional test are ok –> check the glow plug’s lead harness for damage and continuity, if ok –> replace the control box. |
| 022 | Glow plug, output (+), short circuit after UB (battery voltage) | • Check glow plug lead harness for correct laying and damage, if ok —> check lead harness for continuity, if ok —> replace control box. |
| 025 | Diagnostics cable bl/ws – short circuit – after UB (battery voltage) | This fault code cannot be displayed as the diagnostics cable is probably defective. • Check diagnostics cable for correct laying and possible damage.. |
| 030 | EMK blower motor outside the permissible range | Impeller or combustion air blower motor blocked (frozen, soiled, sluggish, lead harness grinds against shaft end …) • Remove blockage. • Check the wire for a short circuit. • Speed measurement of the combustion air blower motor: – Dismantle combustion air fan, see page 31. – Heater 12 V: carry out the test with 11.3 volts ±0.1 volt. – Heater 24 V: carry out the test with 23.6 volts ±0.1 volt. Remove the connector from the control box and apply voltage. Apply marking (white paint) to the impeller and measure the speed using a non-contact r.p.m. counter: If the measured speed in the ”high“ heating level is outside the range – Heater 12 V: n = 4650–7000 rpm, – Heater 24 V: n = 4650–6500 rpm, then replace the combustion air fan, see page 31. If the measured speed is within the range, then replace the control box. |
| 031 | Blower motor interruption | • Check that the lead harness of the blower motor has been correctly laid and for damage, if ok –> remove the lead harness at the control box and check for continuity, if ok –> replace control box. |
| 032 | Blower motor – earth short circuit In the 12-volt heater, carry out the functional check with a max of 11.3 volt. In the 24 volt heater, carry out the functional check with max. 23.6 volt. The component is destroyed if the voltage values are exceeded. Ensure the power pack has adequate short-circuit resistance – min. 20 A. | • Carry out the functional test on the blower motor, to do this remove the connector from the control box. Apply a voltage of 11.3 v or 23.6 V ±0.1 v to the blower motor and after 40 sec measure the current intensity. Heater 12 volt: current intensity < 9 A or heater 24 volt: current intensity < 4 A – blower motor ok –> replace control box, see page 28. Heater 12 volt: current intensity > 9 A or heater 24 volt: current intensity > 4 A –> replace combustion air fan. • Check wiring for a short circuit. |
| 034 | Blower motor outlet (+), short circuit after UB (battery voltage) | • Check that the lead harness of the blower motor has been correctly laid and check for damage, if ok —> remove the lead harness at the control box and check for continuity, if ok —> replace the control box. |
| 047 | Metering pump short circuit or overload | • Remove connector from the metering pump, if the fault code 048 (interruption) is displayed the metering pump is defective –> replace the metering pump. • If the fault code 047 continues to be displayed, disconnect connector S1 / B1 at the heater, and at the connector B1, PIN 5 check the cable 12 gn / rt up to the metering pump for a short circuit to negative (PIN 10), if ok –> replace control box. |
| 048 | Metering pump interruption | • Remove the connector from the metering pump and measure the resistance value of the metering pump (12 V = 9,5 Ω ±0.5 Ω / 24 V = 36 Ω ±1.8 Ω), if resistance value ok –> reconnect cable loom to the metering pump. • Disconnect connector S1 / B1 at the heater and measure the resistance value between PIN 5 and PIN 10, if ok –> replace the control box. |
| 049 | Metering pump outlet (+), short circuit after UB (battery voltage) | • Check that the lead harness of the metering pump has been correctly laid and check for damage, if ok —> remove the lead harness and check for continuity, if ok —> replace the control box. |
| 050 | Too many failed start attempts (operating lock-out) | The control box locks after too many failed start attempts (max. 255 start attempts). • Unlock the control box by deleting the fault memory using the EDiTH customer service program, diagnostic unit, or various control units. |
| 051 | Flame detected when switching on | If, after being switched on, the resistance value of the flame sensor is 1274 Ω (> 70 °C) the heater’s fan rungs for approx. 15 min to cool down, if the resistance does not fall below the aforementioned value within 15 min the heater is switched off. • Check the flame sensor. |
| 052 | Safety time exceeded | No flame was detected during the start phase. • Check exhaust and combustion air system. • Check fuel supply/measure fuel quantity, • Check spark plug (see fault codes 020 and 021). • Check flame sensor, if ok –> replace control box. |
| 053054055056 | Flame cutout in the “POWER” control stage “HIGH” control stage “MEDIUM” control stage “LOW” control stage | The Eberspacher heater has ignited (flame detected) and signals flame cutout during a power stage. • Check exhaust and combustion air system. • Check fuel supply/measure fuel quantity, see page 33. • Check flame sensor, for diagram and table of values please refer to page 30, if ok –> replace control box. |
| 060 | External room temperature sensor – interruption | • Disconnect the plug-in connection of the external room-temperature sensor and measure the resistance value, see page 9 for diagram and values table, if temperature sensor ok –> reconnect plug-in connection. • Disconnect connector S1 / B1 at the heater and measure the resistance value in connector housing B1 between PIN 6 and PIN 12. If an interruption exists the ohmic value between PIN 6 and PIN 12 > 3000 Ω . If resistance value ok –> replace control box. |
| 061 | External room temperature sensor – short circuit | • Disconnect the plug-in connection of the external room-temperature sensor, if error code 060 is displayed –> check external room-temperature sensor, see page 9 for diagram and values table. If the external room temperature sensor ok –> check the connection cables 0.52 gr and 0.52 br/ws for a short circuit, if ok –> reconnect the plug-in connection. • Disconnect connector S1 / B1 at the heater and measure the resistance value in connector housing B1 between PIN 6 and PIN 12. If a short circuit exists the ohmic value between PIN 6 and PIN 12 < 800 Ω. If the error 061 continues to be displayed, –> replace the control box. |
| 062 | Control unit – interruption | • Remove the connector at the control unit and measure the resistance value of the setpoint potentiometer, for connector pins. If the resistance value is ok –> reconnect the connector at the control unit. • Disconnect connector S1 / B1 at the heater and measure the resistance value between PIN 6 and PIN 7 in the connector housing B1, if the resistance value is ok –> replace control box, Resistance value in case of interruption between PIN 6 and PIN 7 > 3000 Ω. Normal value: 1750 Ω ±30 Ω – 2180 Ω ±80 Ω. |
| 063 | Control unit – short circuit Fault recognition only works in heating mode. If, on the other hand, the short circuit has already occurred and then the heater is switched on, „Ventilation“ is active (not a fault code). | • If “Ventilate” switch is installed, disconnect it and check it is working. If ok –> disconnect the connector at the control unit, if error code 062 is displayed, replace the control unit. • If control unit ok –> check connection cables 0.52 gr / rt and 0.52 br / ws for short circuit, if ok –> reconnect connector at the control unit. • Disconnect connector S1 / B1 at the heater, if the error 063 continues to be displayed –> replace control box. Resistance value in case of short circuit between PIN 6 and PIN 7 < 800 Ω. Normal values: 1750 Ω ±30 Ω – 2180 Ω ±80 Ω. |
| 064 | Flame sensor (combination sensor) – interruption | • Dismantle the control box and disconnect the green connector from the control box. Check flame sensor, for diagram and table of values, if flame sensor ok –> replace control box. Resistance value in case of interruption > 3000 Ω. |
| 065 | Flame sensor (combination sensor) – short circuit | • Dismantle control box, remove the green connector from the control box, if error 064 is displayed –> replace combination sensor. If error 065 continues to be displayed –> replace control box, Resistance value in case of short circuit < 500 Ω, |
| 071 | Overheating sensor – interruption | • Dismantle control box, disconnect blue and green connectors from control box. Measure resistance value at the blue connector PIN 1 (cable 0.52 bl) and at the green connector PIN 2 (cable 0.52 br / ws), if ok –> replace control box, Resistance value in case of interruption >700 kΩ, |
| 072 | Overheating sensor – short circuit | • Dismantle control box, remove the blue connector from the control box, if error 071 is displayed –> replace combination sensor, see Page 27. If error 072 continues to be displayed –> replace control box. Resistance value in case of short circuit < 120 Ω, |
| 074 | Control box defective | • Overheating threshold value is not detected by control box —> replace control box. |
| 090 | Control box defective (internal fault) | Replace Eberspacher control box. |
| 2 | Control box defective (ROM error) | Replace Eberspacher control box. |
| 093 | Control box defective | Replace Eberspacher control box. |
| 094 | Control box defective (EEPROM error) | Replace Eberspacher control box. |
| 095 | Control box defective | Replace Eberspacher control box. |
| 096 | Internal temperature sensor defective | Replace the control box or use an external room temperature sensor. |
| 097 | Control box defective | Replace Eberspacher control box. |
| 098 | Control box defective | Replace Eberspacher control box. |
| 099 | Too many resets in sequence Transistor error in the control box | • Voltage short-term < 5 – 6 volt (for 12 volt) or < 7 – 8 volt (for 24 volt). • In case of a voltage drop, check the fuses, the supply cables, the negative connections and the positive support point on the battery for corrosion and correct contact. • Test control box with the testing device, if ok —> check lead harness of the external components has been correctly laid and check for damage, if ok —> check lead harness for continuity, if ok —> replace control box. |