Diesel Air Heaters error codes

121 codes from 5 manufacturers, each with its meaning and the document it comes from. Open a code for the details, or search every system.

Autoterm / Planar AIR (2D/4D/8D/9D) (25)

• 01Overheating of the heat exchanger (PU-5: 1 blink)
• 02Possible overheating at the intake temperature sensor; sensor (control unit) temperature is more than 55 C…
• 05Faulty temperature sensor (AIR-2D) or flame indicator (PU-5: 5 blinks)
• 04/06Faulty temperature sensor in the control unit (PU-5: 6 blinks)
• 07Overheat sensor - open circuit (PU-5: blink count not separately listed in the fault-code table)
• 09Faulty glow plug (PU-5: 4 blinks)
• 10Electric motor of the air blower does not develop the necessary speed (PU-5: 11 blinks)
• 11Faulty air temperature sensor (intake) - only for AIR-8D (PU-5: blink count not separately listed)
• 12Shut down - overvoltage more than 30V (24V) or more than 16V (12V) (PU-5: 9 blinks)
• 15Shut down - low voltage, less than 20V (24V) or less than 10V (12V) (PU-5: voltage-fault; blink count not…
• 13The heater does not start - two automatic start attempts failed (PU-5: 2 blinks)
• 16During the purge time, temperature sensor was not cooled down; time for ventilation was exceeded (PU-5: 10…
• 17Faulty fuel pump (PU-5: 7 blinks)
• 20Heater does not start (PU-5: 8 blinks)
• 27Motor does not rotate (PU-5: 11 blinks)
• 28Motor rotates, speed is not regulated (PU-5: 11 blinks -- air-blower/motor fault group, 'the motor rotates…
• 08/29Flame failure during operation of the heater (PU-5: 3 blinks)
• 30Heater does not start (PU-5: blink count not separately listed)
• 31Overheating of hot-air outlet temperature sensor - only for AIR-8D (PU-5: 14 blinks)
• 32Faulty temperature sensor at air intake - only for AIR-8D (PU-5: 17 blinks)
• 33Heater control is blocked - only for AIR-8D (PU-5: 16 blinks)
• 34Wrong component assembly - only for AIR-8D (PU-5: 19 blinks)
• 35Flame failure - only for AIR-8D (PU-5: 13 blinks)
• 36Flame indicator temperature above normal - only for AIR-8D (PU-5: 20 blinks)
• 78Flame failure during operation (PU-5: 3 blinks)

Chinese generic diesel air heater (Vevor / Hcalory / VVKB and clones — shared mainboard) (10)

• E-01Start-up failure. OEM-equivalent: Webasto AirTop EVO F01 (no start/no flame); Espar Airtronic D2 052 (safety…
• E-02Lack of oil and stalling. OEM-equivalent: Webasto EVO F02 (flame abort/gone out); Espar D2 053-056 (flame…
• E-03Abnormal voltage. OEM-equivalent: Webasto EVO F03 (under/over-voltage); Espar D2 010/011 (over/under-voltage…
• E-04Air outlet temperature sensor failure. OEM-equivalent: Webasto EVO F14 (blow-out/hot-air-outlet temp sensor)…
• E-05Inlet air temperature sensor. OEM-equivalent: Autoterm 11/32 (intake-air temp sensor, PLANAR-8DM); no…
• E-06Oil pump abnormality. OEM-equivalent: Webasto EVO F07 (fuel/metering pump); Espar D2 047/048 (metering pump…
• E-07Fan abnormalities. OEM-equivalent: Webasto EVO F08 (drive/combustion-air motor); Espar D2 031-033 (blower…
• E-08Ignition (glow) plug abnormalities. OEM-equivalent: Webasto EVO F09 (glow plug); Espar D2 020/021 (glow plug…
• E-09High temperature protection (overheat shutdown). OEM-equivalent: Webasto EVO F10 (overheating); Espar D2…
• E-10Furnace temperature sensor abnormal. OEM-equivalent: Espar D2 071/072 (overheat/heat-exchanger sensor) +…

Espar / Eberspacher Airtronic 2 (S2 D2L / M2 D4L) (59)

• P000100Overheating / air outlet sensor - Interruption (legacy 071)
• P000101Overheating / air outlet sensor - Short circuit (legacy 072)
• P000102Overheating / air outlet sensor - Short circuit to battery (+) (legacy 073)
• P000110Air inlet error - Interruption (legacy 087)
• P000111Air inlet error - Short circuit (legacy 088)
• P000112Air inlet error - Short circuit to battery (+) (legacy 089)
• P00010ACold blowing - Timeout (combustion chamber not cooled enough for restart) (legacy 051)
• P000114Possible risk of overheating (implausible signal; >=80 C at overheat sensor in operation) (legacy 014)
• P000115Overheating - software threshold exceeded (overheat sensor >125 C) (legacy 012)
• P000116Overheating - hardware threshold exceeded (overheat sensor >130 C) (legacy 017)
• P00011AOperating lock-out - too many overheating events (legacy 015)
• P000120Flame sensor - Interruption (legacy 064)
• P000121Flame sensor - Short circuit (legacy 065)
• P000122Flame sensor - Short circuit to battery (+)
• P000125Flame cutout from start process (legacy 057)
• P000126Flame cutout within control range 0-25% (legacy 053)
• P000127Flame cutout within control range 25-50% (legacy 054)
• P000128Flame cutout within control range 50-75% (legacy 055)
• P000129Flame cutout within control range 75-100% (legacy 056)
• P00012AUnsuccessful start procedure (legacy 052)
• P00012BOperation inhibit - too many unsuccessful start procedures (locked after 10) (legacy 050)
• P000130External air temperature sensor (LEF2) - Interruption (legacy 060)
• P000131External air temperature sensor (LEF2) - Short circuit (legacy 061)
• P000132External air temperature sensor (LEF2) - Short circuit to battery (+)
• P000143Air pressure sensor - implausible signal (legacy 006)
• P000200Metering pump - Interruption (legacy 048)
• P000201Metering pump - Short circuit (legacy 047)
• P000202Metering pump - Short circuit to battery (+) or transistor error (legacy 049)
• P000210Glow plug - Interruption (legacy 020)
• P000211Glow plug - Short circuit (legacy 021)
• P000212Glow plug - Short circuit to battery (+) or transistor error (legacy 022)
• P000213Glow plug - ignition energy too low (legacy 019)
• P000220Electric (burner) motor - Interruption (legacy 031)
• P000221Electric (burner) motor - Short circuit (legacy 032)
• P000222Electric (burner) motor - Short circuit downstream of +Ub or transistor error (legacy 034)
• P000223Burner motor - Blocking (impeller frozen/soiled/sluggish) (legacy 033)
• P000224Burner motor - Current input too high (legacy 035)
• P000260Universal output - Interruption
• P000261Universal output - Short circuit
• P000262Universal output - Short circuit to battery (+) or transistor error
• P000300Overheating detection - metering-pump hardware or cutout circuit defective (legacy 074)
• P000301Watchdog reset (legacy 090)
• P000302Too many watchdog resets (legacy 090)
• P000303Operating lockout - too frequent output-stage errors (legacy 099)
• P000304Too many resets (loose contact) (legacy 091)
• P000305Control box not calibrated (legacy 095)
• P000306Second cutout circuit is defective (legacy 098)
• P000307CAN communication error in control unit (legacy 081)
• P00030ACAN communication error
• P000310Control box cutout due to overvoltage (>16 V/12V or >32 V/24V for >=20 s) (legacy 010)
• P000311Heater cutout due to overvoltage (legacy 010)
• P000312Control box cutout due to undervoltage (<10 V/12V or <21 V/24V for >=20 s) (legacy 011)
• P000313Heater cutout due to undervoltage (legacy 011)
• P000330ROM error (legacy 092)
• P000331RAM error (legacy 093)
• P000332NVMEM error (EEPROM, DataFlash) (legacy 094)
• P000342Invalid configuration
• P000394ADR button - Short circuit
• P000440Timeout - communication with control unit (legacy 083)

Espar / Eberspacher Airtronic D2 / D4 (classic generation) (13)

• 010Overvoltage cutoff (>16V 12V / >32V 24V sustained 20+ s)
• 011Undervoltage cut-off - supply below the minimum for 20+ seconds without interruption. The cited Espar…
• 012Overheating at overheating sensor
• 013Overheating at flame sensor
• 017Hardware overheating threshold exceeded (control box locked)
• 020Glow plug interruption (open circuit)
• 047Metering pump short circuit or overload
• 048Metering pump interruption (open circuit)
• 050Operating lock-out — too many failed start attempts
• 051Flame detected when switching on (hot-restart inhibit)
• 052Safety time exceeded — no flame during start phase
• 064Flame sensor — interruption (open circuit)
• 071Overheating sensor — interruption

Webasto Air Top EVO 40 / EVO 55 (substantially applies to Air Top 2000 STC) (14)

• F00Control unit defective / heater lock-out / internal room-temp sensor defective
• F01No start / no flame formation
• F02Flame abort (flame extinguished during operation, no reform after restart)
• F03Undervoltage or overvoltage
• F04Premature flame detection
• F07Fuel pump defective
• F08Open circuit / short circuit / overloading / blockage in drive motor
• F09Glow plug defective
• F10Overheating
• F14Blow-out temperature sensor defective
• F16Exhaust temperature exceeded
• F17Exhaust gas temperature sensor defective
• F18Setpoint generator (controller) defective
• F19Plausibility of sensors incorrect