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Eberspacher Fault Codes

Fault Codes for Eberspacher Heaters

Find out what the error codes and fault codes on your Eberspacher Heater with our useful guide. Using this table you can diagnose errors for all Eberspacher vehicle and marine heaters. If you still can't find what you are looking for, try sending our helpful customer support team an email.

Eberspacher Fault code

Eberspacher Fault description

Eberspacher Fault Code Remedy / Solution
• Remedial action

   
000No faults-
004Warning:
Short circuit in 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 short circuit to negative, if ok –> replace control box.
005Warning:
Short circuit in 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 short circuit to negative, if ok –> replace control box,
009ADR shutdownADR shutdown due to signal change from (+) to (–) at connector S1, PIN 13 (D+) or plus signal at connector S1, PIN 14 (HA+).
010Overvoltage cutoutOvervoltage applied to control box for at least 20 seconds without interruption –
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.
011Undervoltage cutoutUndervoltage 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.
012Overheating at the overheating
sensor (combination sensor)
Temperature of the overheating sensor too high.
• Check hot air pipes for blockage –> remove 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 catalogue.
• Check overheating sensor If ok –> measure fuel quantity.
013Overheating at the flame sensor
(combination sensor)
Flame sensor signals temperature at heat exchanger is too high.
• Check hot air pipes for blockage –> remove 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 catalogue.
• Check flame sensor, if ok –> check overheating sensor, if overheating sensor defective –> replace combination sensor, if overheating sensor ok –> measure 
014Temperature difference between
flame sensor and overheating
sensor too large
Temperature difference between flame sensor and overheating sensor too large
• Check hot air pipes for blockage –> remove 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 catalogue.
• 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.
015Operating lock-outThe 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 control box
017OverheatingThe hardware threshold value for the overheating sensor has been exceeded,
because the control box failed to recognise the fault code 012 or 013 –> the
control box is locked.
If the heater is switched on again, the fault code 015 is displayed.
• Switch off control box
020Glow 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,
021Glow 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 control box,
022Glow 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,
025Diagnostics 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..
030EMK blower motor outside the permissible rangeImpeller or combustion air blower motor blocked (frozen, soiled, sluggish, lead
harness grinds against shaft end ...)
• Remove blockage.
• Check wiring for short circuit.
• Speed measurement of the combustion air blower motor:
– Dismantle combustion air fan, see page 31.
– Heater 12 V: carry out test with 11.3 volt ±0.1 volt.
– Heater 24 V: carry out test with 23.6 volt ±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.
031Blower motor interruption• Check that the lead harness of the blower motor has been correctly laid and
for damage, if ok –> remove lead harness at control box and check for continuity,
if ok –> replace control box.
032Blower motor – earth short circuit In the 12 volt heater, carry out the functional check with max 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 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 short circuit.
034Blower 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 lead harness at control box and check for
continuity, if ok —> replace control box.
047Metering 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 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 short circuit to negative (PIN 10), if ok –> replace control box.
048Metering pump interruption• Remove 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 control box.
049Metering 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 lead harness and check for continuity,
if ok —> replace control box.
050Too 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.
051Flame 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.
052Safety time exceededNo flame detected during the start phase.
• Check exhaust and combustion air system.
• Check fuel supply / measure fuel quantity,
• Check spark plug (see fault code 020 and 021).
• Check flame sensor, if ok –> replace control box.

053

054

055

056

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.
060External 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.

061External room temperature sensor – short circuit

• Disconnect 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 external room temperature sensor ok –> check the connection cables 0.52 gr and 0.52 br/ws for short circuit, if 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 a short circuit exists the ohmic value between PIN 6 and PIN 12 < 800 Ω. If the error 061 continues to be displayed, –> replace control box.

062Control unit – interruption• Remove connector at the control unit and measure the resistance value of the setpoint potentiometer, for connector pins. If the resistance value is ok –> reconnect 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 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.
063Control 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 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 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.
064Flame sensor (combination sensor) – interruption• Dismantle control box and disconnect green connector from 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.
065Flame sensor (combination
sensor) – short circuit
• Dismantle control box, remove green connector from 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,
071Overheating 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,
072Overheating sensor – short
circuit
• Dismantle control box, remove blue connector from 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,
074Control box defective• Overheating threshold value is not detected by control box —> replace control box.
090Control box defective
(internal fault)
Replace Eberspacher control box.
2Control box defective
(ROM error)
Replace Eberspacher control box.
093Control box defectiveReplace Eberspacher control box.
094Control box defective
(EEPROM error)
Replace Eberspacher control box.
095Control box defectiveReplace Eberspacher control box.
096Internal temperature sensor
defective
Replace control box or use external room temperature sensor.
097Control box defectiveReplace Eberspacher control box.
098Control box defectiveReplace Eberspacher control box.
099

Too many resets in sequence


Transistor error in 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 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.