Webasto Air Top Series User manual

Operating Instructions
Air Top Series Heaters
Introduction
Dear Webasto Customer,
Thank you for choosing a Webasto Air
Top Series Heater. Air Top Series
Heaters are used
–to heat cabins, boats, trucks, minibuses, vans and motor-homes and
–to defrost vehicle windows.
We presume that the principle and mode of operation of your
new heater has been explained to your complete satisfaction by
the workshop or service center which installed the heater. In
these operating instructions we would like to once again
provide you with an overview of the safe use of your new
heater.
Repair work should only be carried out by an authorized Webasto dealer.
Servicing and Safety Instructions
1. While a Webasto heater is in use, the product surface, connected
hoses, ducting, and air outlet(s) may become hot to the touch. Contact
with skin may cause burns.
2. Webasto heaters must be switched OFF when re-fueling at filling
stations and/or while loading or unloading flammable materials
for transport, to prevent the risk of explosion. Please review the
owner’s manual for safety and use instructions.
3. The year in which the heater was used for the first time must be
permanently displayed on the factory plate by deleting the inapplicable
years from the plate.
4. The heaters are not designed for heating hazardous substance
transport compartments.
5. Claims can only be made if it can be verified that the claimant has
complied with the servicing and safety instructions.
6. The heater may not be operated in enclosed spaces (such as
garages) as a result of the risk of poisoning and asphyxiation,
even if a timer is used.

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7. Improper installation or repair of Webasto heating systems can cause
fire or the leakage of deadly carbon monoxide leading to serious injury
or death.
8. The heater must be checked by an expert at the latest at the start
of the cold-weather period.
9. NEVER attempt to install or repair a Webasto heating system unless you
have successfully completed Webasto factory training and have the
technical skills, technical information, tools, and equipment required to
properly complete the necessary procedures. Only genuine Webasto
parts may be used.
10. In the event of a long-term heavy smoke condition, unusual
combustion noises, the smell of fuel, or if the heater suffers
continuous faults with error messages (flashing code), it must be
shut down by removing the fuse and must not be reused until it
has been inspected by Webasto- trained personnel.
11. Webasto products produce temperatures high enough to ignite
surrounding combustible materials such as inflammable liquids, gases,
vapor, and other combustible matter. The heater must be switched off
when loading or unloading inflammable materials to prevent the risk of
explosion.
12. The heat transfer unit on air heaters is exposed to very high
thermal stress and must be replaced by a genuine Webasto spare
part ten years after it is used for the first time.
If exhaust lines pass through areas used by personnel, they
must also be replaced by genuine spare parts after ten years.
13. The fuel specified by the vehicle manufacturer is suitable for use in the
Air Top 2000 ST B (gasoline).
14. The diesel fuel specified by the vehicle manufacturer is
suitable for use in the Air Top 2000 ST D (diesel).
15. There are no known negative influences due to fuel additives when
used appropriately.
16. If fuel is extracted from the vehicle’s tank, follow the additive
instructions issued by the vehicle manufacturer.
17. If you change to low-temperature fuel, the heater must be operated
for approx. 15 minutes so that the fuel system is filled with the new fuel.
18. The temperature in the area around the heater must not
exceed 85 °C / 185° F (storage temperature). If the temperature
exceeds this level there is a risk of permanent damage to the
electronics systems.
19. Webasto rejects any liability for problems and damage caused by the
system being installed by untrained personnel.
20. Keep the hot air inlet and hot air outlet free of dirt and
foreign bodies. Soiled or blocked hot air lines may cause
overheating.
21. To prevent mechanical parts seizing, the heater should be operated for

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approx. 20 minutes once a month.
22. Do not stand on the heater and do not place any heavy items
on the heater or throw items at the heater.
23. Do not place any items of clothing, textiles or similar materials over
the heater or in front of the hot air inlet and the hot air outlet.
24. The heater must not be cleaned with a high-pressure cleaner.
25. ALWAYS and carefully follow Webasto installation and repair
instructions and heed all WARNINGS.

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Control Element
Rotary knob for:
-Switching on and off
-Setting the room temperature
-Resetting after a fault cut-out
Indicator / error code display
Switch ON
Set the rotary knob on the control element to the desired temperature.
NOTE:
To prevent the combustion air fan from scraping, ensure that there
are no objects on or against the heater before you turn it on.
Ventilation
Option
A separate switch (optional) allows the user to choose between heating
and ventilation mode. In ventilation mode the fan speed depends on the
position of the control element knob.
SmarTemp
Control
Changes to the settings
on the control element
will be carried out with
a short time delay
*aThe micro USB service port is used for Webasto heater diagnostic purposes on
the SmarTemp 2.0 only. This port cannot be used to charge electronic devices.

5
Heater ON Example (2.0)
Press the Webasto button to turn heater on.
Set Temperature Output & Heater Runtime Example
Using the rotary dial and the selection button, follow these steps to set
your cab temperature to 70°F with a runtime of 4 hours.
1. Press the Selection button. Using the rotary dial, select: Options
> Duration > Timed > Adjust runtime to 4 hours. Confirm the
adjustment by pushing the selection button.
2. From the main screen use the rotary dial to adjust the set temperature
to 70°F; confirm the
adjustment by pushing the selection button.
NOTE: The set temperature can be adjusted quickly even when the heater is
running using the same method as above.
Set Timer Example
Set timer to turn on Friday at 6:30AM with a runtime of 60 minutes.
1. Press the Selection button. Using the rotary dial, select Timer.
2. Highlight the timer feature, press the Selection button. Select “edit”
from the sub-menu.
3. Adjust and select day for Friday.
4. Adjust and select time for 6:30AM.
5. Adjust and select runtime for 60 minutes.
6. Settings are saved each time the selection button is pressed.
Heater ON Example (3.0)
Press the Webasto button to turn heater on.
Set Temperature Output & Heater Runtime Example – Air Heater
Using the rotary dial and the selection button, follow these steps to set your
cab temperature to 70°F with a runtime of 4 hours.
1. Press the Selection button. Using the rotary dial, select: Duration > Timed
> Then set your duration to 4 hours. Confirm the adjustment by pushing
the selection button.
2. From the main screen use the rotary dial to adjust the set temperature to
70°F; confirm the adjustment by pushing the selection button.
NOTE: The set temperature can be adjusted quickly even when the heater is
running using the same method as above.
Set Timer Example
Set timer to turn on Friday at 6:30AM with a runtime of 60 minutes.
1. Press the Select button. Using the rotary dial, select Timer.

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2. Highlight the timer feature, press the Selection button. Select “edit”
from the sub-menu.
3. Adjust and select day for Friday.
4. Adjust and select time for 6:30AM.
5. Adjust and select runtime for 60 minutes.
6. Settings are saved each time the Select button is pressed.
Refer to Menu Descriptions Table for a detailed description of each menu item
and its default setting.
Set Temperature Output & Heater Runtime Example – Air Heater
Using the rotary dial and the selection button, follow these steps to set your
cab temperature to 70°F with a runtime of 1 hour.
3. Press the Select button. Using the rotary dial, select: Duration > Timed >
Then set your duration to 1 hour. Confirm the adjustment by pushing the
selection button.
4. From the main screen use the rotary dial to adjust the set temperature to
70°F; confirm the adjustment by pushing the selection button.
NOTE: The set temperature can be adjusted quickly even when the heater is
running using the same method as above.

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Menu Description
Refer to Menu Descriptions Table for a detailed description of each menu item
and its default setting. Depending on the SmarTemp version, menu order
may vary from order below.
Definitions Default
Mode
Mode changes the operation of the heater between
heat mode and ventilation mode. Status indicator
lights will illuminate red for heat mode and blue for
ventilation mode when the selected mode is active.
Heat
Mode
Timer (3.0)
User can select a specific day, time and heater
runtime up to 7 days in the future. Be aware this is a
one-occurrence timer requiring the user to turn the
timer “ON” again after each scheduled timer use.
When selecting timer a sub-menu will appear (Edit,
On, and Off). To modify timer settings, select “edit”.
Select the day, time, and heater runtime using the
rotary knob and the selection button. Settings are
saved each time the selection button is pressed. If the
timer function will be used regularly for next day
startups, the “ANY” setting can be used in place of
the day of the week. With this set, the timer will
disregard the day setting and start during the next
24-hour period based on the time selected. The
“ANY” setting is located in the list of days between
Saturday and Sunday.
OFF
Language
Language changes between English, Spanish, and
French.
English
Offset (3.0)
This allows the user to set an offset (plus or minus
9ºF, 5ºC) to compensate
for any temperature difference between what the
SmarTemp reads, and what the operator feels.
NOTE: This function only applies to air heaters.
0º
Temp Unit
Temp Unit changes between Fahrenheit and Celsius
units of measure.
Fahrenhe
it
Backlight
(3.0)
Set intensity of backlight.
80%
User
Permission
(3.0)
A password can be set to prevent access to the
advanced “Options” menu. Enter a 4-digit code
passcode to begin securing the “Options” menu.
Note: This is typically used in fleet vehicle
applications.
Disabled

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Bluetooth Enable or disable Bluetooth functionality.
En
abled
Error Code
This section will log the last 5 error codes and the
date that it was set. Highlight and select an error
code for a full description. If the heater produces an
error code, the status indicator lights will flash red
and the error will display on the main screen.
NOTE: Heater error codes cannot be reset through
the Webasto SmarTemp Control 3.0; a Webasto PC
Diagnostics tool or the SmarTemp app is required.
Refer to the heater service manual for resetting an
error code.
Brake
Input
Signal (3.0)
When enabled the heater will only start when the
parking brake is enabled and a 12V signal on the
Brake Input pin of the SmarTemp 3.0 connector.
NOTE: This feature is only used in original-
equipment
applications.
En
abled
Heaters
(3.0)
Allows you to name the heater(s) connected to the
SmarTemp through the mobile application after
selecting number of heaters. The control method
(analog or W-Bus) to be selected.
NOTE: W-Bus is not a control option for the TT Evo
heater when used with an Air Top heater.
Options
(2.0)
Advanced level adjustments; see below.
Duration
Duration allows for the selection of continuous
heater operation or timed operation (30 minutes
– 14 hours in 30 minute increments).
IMPORTANT: Timed duration is not to be mistaken
for Timer functionality. The duration times above are
used when turning the heater on manually. I.e. set
the heater duration for 8 hours before heading to
bed.
Note: If timed operation is selected 10 hours is
default.
Continuo
us

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LVD
LVD “Low Voltage Disconnect” allows the user to
set the battery voltage level at which the Webasto
SmarTemp Control 2.0 will shut down the heater.
If battery voltage is equal to or less than the
threshold selected +0.1v, the heater will not start.
I.e. if an 11.5v threshold is selected the heater
cannot be started until B+ has reached 11.7v.
12 volt - Range between
11v – 12.5v 24 volt -
Range between 21v –
25.5v
11.4v
24.2v
Password
A password can be set to prevent access to the
advanced “Options” menu. Enter a 4 digit code
passcode to begin securing the “Options” menu.
Note: This is typically used in fleet vehicle
applications.
OFF
PM
Reminder
If the heater has not run 30 days, the preventive
maintenance (PM) reminder will alert the operator
with a message to run the heater for 20 minutes.
The indicator lights will flash red as a visual reminder.
The operator will have the ability to Start the 20
minute maintenance cycle or delay it via a “Snooze”
option. When Snooze is selected the PM reminder
will postpone until 12:00PM the following day.
ON
Time & Date
Set time and date using the rotary knob and
selection button. 12 (AM / PM) or 24 hour available.
The Webasto button can be used to go back to the
previous field if additional changes are needed.
12 hour
Offset
Depending on the installation location, the
temperature reading may vary slightly. The Offset
feature allows a temperature adjustment of +/-
9°F (+/- 5°C). Adjust this as necessary to obtain
the most accurate ambient temperature reading.
0°
Default
Default allows the user to perform a factory reset of
the control settings.
Note: Heater information will NOT be affected.
N/A
Use the following link to obtain version specific
controller operation instructions.
http://www.techwebasto.com/documentation/heater/re
creational.html

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Actions in event of faults
If an error occurs, first check the fuse and plug connections to ensure that
they are in proper condition and con- nected correctly.
If the actions described below do not rectify the error, have the heater checked
by Webasto-trained personnel.
Heater unit cuts out automatically
Cause Remedy
No
combustion
after start and
repeat start
Flame extinguishes
during operation
Heater unit overheats
and indica- tor flashes
Switch heater unit off (for at least 2
seconds) and then on again
Switch heater unit off (for at least 2
seconds) and then on again
Make sure that hot air can flow freely,
allow heater unit to cool down, Switch
heater unit off (for at least 2 sec- onds)
and then turn on again
Vehicle voltage too low Charge battery
Switch heater unit off (for at least 2
seconds) and then turn on again
Heater unit emits black smoke
Cause Remedy
Combustion air
and/or exhaust
system blocked
Check combustion air and exhaust system for
blockage

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Error code output on combination timer or control element
If the system is fitted with a combination timer, when an error occurs an error
code is displayed on the timer's screen until the heater has been properly
repaired.
The error code is output if the heater is fitted with a control element after an
error has occurred by the switch- on indicator/error code indicator flashing.
After a burst of fast flashes the error code will be displayed by a se- quence of
long flashes, the number of which is shown in the table below.
Error code Meaning
F 00* Control unit error
F 01 No start (after 2 starting attempts)
F 02 Flame failure (at least > 3)
F 03 Undervoltage or overvoltage
F 04 Premature flame recognition
F 05 Flame monitor (petrol heater) interrupt or short circuit
F 06 Temperature sensor interrupt or temperature sensor short circuit
F 07 Metering pump interrupt or metering pump short circuit
F08 Fan motor interrupt or fan motor short circuit or fan motor overload
or blocked
F 09 Glow plug interrupt or glow plug short circuit
F 10 Overheating
F 11* Overheating sensor interrupt or overheating sensor short circuit
F 12* Heater unit lock-out
F 14 Overheating sensor installed incorrectly / defective
F 15* Defective controller / open or short circuit
F 16** Exhaust temperature exceeded
F 17** Exhaust gas temperature sensor defective
F 18** Defective controller / open or short circuit
F 19** Plausibility of sensors incorrect (exhaust / overheat sensor)
If serious malfunctions such as overheating or failure occur, the
heater will go into a locked state (F 12). This state can be reset
by using the following heater lockout reset procedure.
*Not used on EVO 40 and EVO 55
** Not used on AirTop 2000ST and 2000STC

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Heater Lock-out Reset Procedure
The control unit continuously monitors the heater operation. The control
unit identifies errors on individual heater components and faults during
operation. Should the control unit experience component errors and
operational faults, the heater may be shut down.
Causes:
The heater is shut down (fault lock-out) if:
No or incorrect start
Temperature sensor defective
Overheating sensor interrupt or short circuit
Overheating sensor installed incorrectly
Ceramic glow pin interrupt or short circuit
Fan motor overload or blocked or short circuit or interrupt
Error in the fuel metering pump or circuit
Under voltage or over voltage for longer than 20 seconds.
Control unit defective
Overheating
Effects:
The fuel supply is stopped if the heater overheats.
The heater continues to run in the same way as if it is switched off manually.
After the heater stops the control unit may set in fault lock-out mode.
Heater Lock out Reset Procedure:
1. Switch the heater ON
2. Within 10 seconds disconnect power from the heater (unplug the harness,
disconnect the battery, remove the fuse)
3. Wait 10 seconds
4. Switch the heater OFF
5. Reconnect power
6. Switch the heater ON
7. Rectify the cause of the fault
IMPORTANT: Heater fault codes can be read using PC Diagnostics, however,
the heater lockout reset must be manually performed using the procedure
stated above.
If you have any questions, contact our technical support team at:
[phone] or via email at: [e-mail].
Product Registration
The heater can be registered by visiting
www.techwebasto.com or by scanning the
code.
A proof of purchase is required for all heaters that
are not registered.

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Limited Non-Transferable Warranty
Webasto Thermo & Comfort North America, Inc. (hereinafter referred to as
Webasto) warrants their heaters and heater kits against defects in material and
workmanship for two (2) years effective at the time of installation or vehicle
registration date for original equipment installation (OEM). This warranty period
may not exceed three (3) years from the original date of sale by Webasto. This
warranty period may be superseded by written contractual agreements.
All models are limited to 2,000 maximum operating hours.
Replacement parts are covered for six (6) months or the remainder of the
original warranty period, whichever is longer.
The intent of the Webasto warranty is to protect the original end-user of the
heater from defects and provide free repair and replacement of defective
parts in the manner provided herein. During the warranty period, the
exclusive remedy will be for Webasto, at their discretion, to repair or replace
those parts which are demonstrated to be defective in material or
workmanship.
While warranty is provided to the “original end-user”, it is to be administered
and serviced through an authorized Webasto dealer in accordance with the
Webasto warranty policy or contractual agreement between Webasto and a
second party.
To locate the nearest Webasto authorized dealer for warranty service:
visit http://www.techwebasto.com or call [phone] in USA, (800) 667-
8900 in Canada.

Webasto Thermo & Comfort
N.A., Inc 15083 North Road
Fenton, MI 48430
Technical Assistance
Hotline USA: (800)
860-7866
Canada: [phone]
Org. 3/2017 Rev: 05/2021
P/N: 5012526D
www.webasto.us
www.techwebasto.com