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Webasto Air Top Evo 40 - User Manual

Webasto Air Top Evo 40
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Air Heater
Air Top Evo 40 / 55
Installation/Operation Manual
WARNING!
When heater is in use, the surface of the hot air outlet may become hot to the touch.
Contact with skin may cause burns.
Improper installation or repair of Webasto heating and cooling systems can cause fire
or the leakage of deadly carbon monoxide leading to serious injury or death.
Installation and repair of Webasto heating and cooling systems requires special
Webasto training, technical information, special tools and special equipment.
NEVER attempt to install or repair a Webasto heating or cooling system unless you
have successfully completed the factory training course and have the technical skills,
technical information, tools and equipment required to properly complete the
necessary procedures.
ALWAYS carefully follow Webasto installation and repair instructions and heed all
WARNINGS.
Webasto rejects any liability for problems and damage caused by the system being
installed by untrained personnel.
Improper installation or installation by untrained personnel voids all warranties on
this product.
Webasto heating and cooling systems require qualified and/or professional
installation and repair technicians. Warranty shall be void if not installed by a
certified or trained installer/repair technician who has successfully completed the
factory training course for installation and repair of Webasto heating and cooling
systems, and has been provided with the technical information, tools and equipment
required to properly complete the necessary installation/repairs.

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Questions and Answers

  • L
    Lucas MillsAug 19, 2025
    How to fix Webasto Air Top Evo 40 that switches off automatically?
    • J
      Janet FosterSep 12, 2025
      If the Webasto Heater switches off automatically, try switching it off for at least 2 seconds and then switch it back on. If the issue persists, it is recommended to contact a Webasto service workshop.
  • B
    Billy HuntAug 21, 2025
    What to do if my Webasto Heater has no start and no flame formation?
    • S
      Sherri GomezAug 21, 2025
      If your Webasto Heater shows no start and no flame formation, check the fuel supply, ensuring the tank isn't empty and the lines aren't blocked. Inspect the exhaust temperature sensor for any deposits and clean it carefully if needed. Also, examine the evaporator mount and replace it if necessary.
  • G
    gpearsonAug 25, 2025
    Why does my Webasto Air Top Evo 40 produce black smoke?
    • E
      edwardsjacquelineAug 25, 2025
      If your Webasto Heater produces black smoke, check the combustion air and exhaust gas routing to ensure they are not blocked.
  • S
    summerwiseAug 26, 2025
    How to fix an overheating Webasto Air Top Evo 40?
    • G
      Gina WilliamsAug 26, 2025
      If your Webasto Heater is overheating, identify and eliminate the cause of overheating in the hot air guide. Possible causes include high-pressure loss, kinked lines, closed air outlets, or a soiled blow-out temperature sensor.
  • T
    Tom JacobsonAug 27, 2025
    What to do if Webasto Air Top Evo 40 Heater overheats?
    • C
      Charles DayAug 28, 2025
      If your Webasto Heater overheats, first check the cold and hot air lines to ensure they are not blocked. Allow the heater to cool down, then switch it off for at least 2 seconds before switching it back on.
  • B
    Bill MillsAug 30, 2025
    What to do if Webasto Heater shows F03 error?
    • J
      jasonhallAug 30, 2025
      If you see error code F03 on your Webasto Heater, indicating low on-board power supply, undervoltage, or overvoltage, start by charging the vehicle battery. Then, switch off the heater for at least 2 seconds before switching it back on.
  • J
    John GordonSep 1, 2025
    How to troubleshoot Webasto Air Top Evo 40 Heater F01 error?
    • R
      Regina BrownSep 1, 2025
      To address a 'No starting' error (F01) on your Webasto Heater, try switching off the heater for at least 2 seconds and then switch it back on.
  • S
    Sandra CraneSep 3, 2025
    What to do if Webasto Air Top Evo 40 displays F02 error?
    • R
      Robert HeathSep 3, 2025
      To address the F02 error, which indicates that the flame goes out during operation in your Webasto Heater, switch off the heater for at least 2 seconds and then switch it back on.
  • A
    Anna RogersSep 5, 2025
    What to do if Webasto Heater fails on vehicles transporting hazardous goods?
    • N
      Nicole HallSep 5, 2025
      If you are transporting hazardous goods, make sure that the pumping device is out of operation. Wait until the Webasto Heater switches to fault lock-out, then switch off the heater via the control element and switch it back on via the control element.
  • S
    Stephanie KimSep 7, 2025
    What to do if my Webasto Air Top Evo 40 Heater experiences flame abort?
    • D
      Donna MurraySep 7, 2025
      If the Webasto Heater experiences a flame abort, check the fuel supply to ensure that the tank is not empty and the lines are not blocked. Inspect the exhaust temperature sensor for deposits from outside through the exhaust fitting and clean carefully if necessary. Check the evaporator mount and replace if necessary.

Summary

Safety and General Information

Warning Symbols in this Installation Manual

Explains safety symbols and signal words used to convey hazard levels.

Regulation for Installation in the Vehicle

Legal Provisions

States that installation requires special expertise and training; voids warranties if done by untrained personnel.

Position of the Heater

Discusses heater placement, protection from heat, and visibility of the indicator.

Fuel Supply

Details requirements for installing fuel lines, securing them, and protecting them from heat.

Exhaust System

Specifies positioning of the exhaust outlet away from interior and flammable materials.

Combustion Air Inlet

States combustion air must not be from the passenger cabin and inlet must not be obstructed.

Hot Air Inlet

Requires fresh or recirculated air from a clean area, protected by a grating.

Installation

Fuel Supply

Combustion Air System and Exhaust System

Electrical Connections

Heater Connection

Details steps for connecting the heater, including fuse installation and cover replacement.

Supply Voltage Connection

Advises connecting to the vehicle's electrical system or batteries with fused protection.

Pre-Start Checklist

Operation Instructions

Starting Heater for the First Time

Outlines the initial steps for starting the heater, including bleeding the fuel system.

Troubleshooting

Error code output

Explains how error codes are generated and lists common error codes and their meanings.

Fault Lock-out

Describes conditions leading to fault lock-out and how the system behaves.

Annex

Wiring Diagrams

Shows wiring diagrams for different control elements and voltage configurations.

Webasto Air Top Evo 40 Specifications

General IconGeneral
Heating Power1.5 - 4.0 kW
Fuel TypeDiesel
Fuel Consumption0.18 - 0.49 l/h
Power Consumption15 - 40 W
Power Supply12 V DC

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