How to unlock a Webasto heater with your own hands

Error codes for Webasto heaters are issued either to the digital remote control in the form FXX (xx is the fault number), or by the number of long blinks of the LED on the temperature controller.

Number of flashes	Code number	Description of the error
f00	There are no errors.
1	f01	The heater does not start after two attempts.
2	f02	Flame break.
3	f03	Voltage drop or overvoltage.
4	f04	Premature flame detection.
5	f05	Open circuit or short circuit of the flame sensor.
6	f06	Open circuit or short circuit of the temperature sensor.
7	f07	Open circuit or short circuit of the dosing pump.
8	f08	Open circuit, short circuit, or incorrect air blower motor speed.
9	f09	Open circuit or short circuit of the glow pin/flame sensor.
10	f10	Heater overheating.

Number of flashes	Code number	Description of the error
f00	Control unit malfunction.
1	f01	Two unsuccessful startup attempts or no flame detected.
2	f02	Flame break.
3	f03	Voltage drop or overvoltage.
4	f04	Premature flame detection.
5	f05	Open circuit or short circuit of the flame sensor (only for 2000ST gasoline).
6	f06	Open circuit or short circuit of the temperature sensor.
7	f07	Open circuit or short circuit of the dosing pump.
8	f08	Open circuit or short circuit of the blower motor, overload or blockage of the blower impeller
9	f09	Open circuit or short circuit of the glow pin.
10	f10	Heater overheating.
11	f11	Open circuit or short circuit of the heating limiter.
12	f12	Heater blocking.
14	f14	Incorrect position of the overheating sensor.
15	f15	Open circuit or short circuit of the potentiometer on the control.

Number of flashes	Code number	Description of the error
f00	Control unit malfunction.
1	f01	No flame is formed.
2	f02	Flame break.
3	f03	Voltage drop or overvoltage.
4	f04	Premature flame detection.
5	f05	—
6	f06	Open circuit or short circuit of the temperature sensor.
7	f07	Open circuit or short circuit of the dosing pump.
8	f08	Open circuit, short circuit, or incorrect air blower motor speed.
9	f09	Open circuit or short circuit of the glow pin/flame sensor.
10	f10	Heater overheating.
11	f11	Open circuit or short circuit of the heating limiter.
12	f12	Open circuit or short circuit of the control thermostat.

Number of flashes	Code number	Description of the error
f00	Control unit malfunction.
1	f01	Two unsuccessful startup attempts or no flame detected.
2	f02	Flame break.
3	f03	Voltage drop or overvoltage.
4	f04	Premature flame detection.
5	f05	—
6	f06	Open circuit or short circuit of the temperature sensor.
7	f07	Open circuit or short circuit of the dosing pump.
8	f08	Open circuit or short circuit of the blower motor, overload or blockage of the blower impeller
9	f09	Open circuit or short circuit of the glow pin.
10	f10	Heater overheating.
11	f11	Open circuit or short circuit of the heating limiter.
12	f12	Heater blocking.
14	f14	Incorrect position of the overheating sensor.
15	f15	Open circuit or short circuit of the potentiometer on the control.

Description of Webasto

The device does not weigh more than 5 kilograms and is integrated into the fuel supply and cooling system. The main task assigned to the device is to heat the fuel and the interior of the car. For accuracy and smooth operation, it is recommended to contact experienced specialists who will ensure installation and correct settings.

Using the device, it is easier to start the engine in cold and frosty conditions, as well as to melt snow and ice on the car windows. Therefore, Webasto is a relevant device for use in our climatic conditions.

Webasto preheater

Principle of operation

The set includes a remote control with which control is carried out. The operating principle is as follows:

1. A flammable liquid is supplied from the tank, where it is heated in the combustion chamber. As soon as the liquid reaches 40 degrees, Webasto automatically turns off.
2. The pump pumps the liquid further, it enters the engine and radiator, warming it and the interior.

The operation of the device is controlled by engine and ambient temperature sensors. It can start while the car is operating when the temperature outside is less than 5 degrees Celsius. In this case, fuel consumption can be minimized, and the car can be warmed up in the shortest possible time even in severe frost. On average, savings are 0.5 l/hour. The second control option for Webasto is a timer, which allows you to use the temperature maintenance mode. Upon arrival at the garage, the car owner will be able to appreciate the warm interior and pre-warmed car.

Kinds

The main types of Webasto include: liquid and air models. The Webasto instruction manual will help you figure out exactly which type of device suits your car. One such option is an air system, which consumes 0.2 fuel per hour.

When pumping fuel for combustion, air is forced from outside the machine. The resulting warm-air mixture promotes the release of heat during combustion. The heat exchanger ensures the selection of heat, which then enters the cabin. And all the excess comes out through the muffler. If the liquid type of device is installed under the hood, then the air type is installed inside the car.

Eberspacher fault codes

Disconnect the plug connection heater/cable harness, start the vehicle engine, measure the voltage. Plug B1, pin C2 and C3:

Disconnect the plug connection heater/cable harness, start the vehicle engine, measure the voltage. Plug B1, pin C2 and C3:

– If the voltage is 70 K.

Pump out the air from the heating device (lack of water), open the heating damper and check the mass flow of water.

Measure the ohmic resistance of the temperature sensor, plug B5, pins 14 and 18, see page 28 for measurement values.

Apply the appropriate voltage and measure the current after 25 or 30 s. Plug B5, pin 2 and 7:

The following values ​​indicate that the electrode pin is OK; if the values ​​deviate, replace the probe electrode (see page 24).

at 8 V after 30 s = 12 A ±1.0 A

at 18 V after 25 s = 5.3 A ±0.8 A

Check the combustion air blower motor by applying 8 V or 18 V supply voltage to the motor. Plug B5, pin 1 and 4:

The air blower motor into the combustion chamber does not rotate - replace the motor with a built-in sensor.

Turn on the heating, check the voltage and power supply to the sensor. plug B5, pin 10 and 5:

set value = 5 V

If there is any deviation, replace the control unit (see page 24).

measure the voltage with the blower running using an analog voltmeter

Plug B5 pin 13 and 5

Setpoint: Average 4V (+/- 0.3) (8V square wave).

If there is a deviation, replace the combustion air blower motor along with the built-in sensor.

If the sensor signal is OK, then the speed controller is faulty

Operating principle

When the driver turns on the unit, a fuel-air mixture is supplied to it, which then ignites and burns. Due to this, the coolant in the heat exchanger is heated. The pump responsible for circulation in the heater pumps antifreeze throughout the system through the radiator-heat exchanger, thereby warming the engine. The unit is also connected to the standard cabin heating system and controls the start of the fan.

So, in winter the driver may not have to wait for the power unit to warm up. The engine will quickly enter operating temperature mode with one press of a key on the remote control.

Error codes WEBASTO AirTop 2000/3500/5000 ST

Code	Malfunction
F00	control unit is faulty
F01	2 unsuccessful start attempts or no flame is formed
F02	flame break (repeated more than 3 times)
F03	voltage drop below permissible or increase above permissible
F04	premature flame detection
F05	open circuit or short circuit of the flame sensor (AT 2000 ST gasoline only!)
F06	open circuit or short circuit of temperature sensor
F07	open circuit or short circuit of the dosing pump
F08	open circuit or short circuit of the blower motor, overload or blockage of the blower impeller
F09	open circuit or short circuit of the glow pin
F10	overheat
F11	open circuit or short circuit of the heating limiter
F12	heater blocking: remove the fuse and put it back
F14	incorrect position of the overheating sensor
F15	open circuit or short circuit of the potentiometer on the control

REMOVAL OF EMERGENCY LOCK

Relevant for Webasto Air Top heaters:

• Webasto Air Top 2000/ 2000 Diagnose/ 2000S
• Webasto Air Top 2000 ST/ 2000 STC
• Webasto Air Top 3500 / 5000
• Webasto Air Top 3500 ST / 5000 ST
• Webasto Air Top Evo 3900 / Evo 5500
• Webasto Air Top Evo 40 / Evo 55

The heater goes into an emergency blocking state if several (6–20) faults of the same type occur in a row (see more details below).

To remove the emergency lock you need to:

• 1. Turn on the heater using the control (error code F12 or 07 will be displayed, or the LED will flash 12 times).
• 2. De-energize the heater (remove the power fuse protecting the heater control unit, or de-energize the heater in any other convenient way, including removing the battery terminal).
• 3. Turn off the heater control.
• 4. Wait at least 10 seconds.
• 5. Restore the power supply to the heater (replace the power fuse, or restore the power circuit in another way).
• 6. Turn on the heater using the control again.

Emergency shutdown.

During the startup process and throughout the operation of the heater, the control unit checks its components for faults.

In case of the following malfunctions, it turns off (blocks) the heater:

• • Lack of combustion or error at startup
• • Damage to the temperature sensor
• • Interruption (break) or short circuit of the overheat sensor
• • Incorrect installation of the overheating sensor
• • Interruption or short circuit of the glow pin/flame sensor.
• • Interruption or short circuit in the blower motor circuit or incorrect speed.
• • Interruption or short circuit in the metering pump circuit
• • Undervoltage below 10/21 V for more than 20 seconds.
• • Increased voltage above 16/32 V for more than 6 seconds
• • Malfunction of the control unit itself
• • Overheating

For more details, see “Webasto Air Top - error codes.”

If the heater overheats, the fuel supply stops. Turning off the heater during an emergency shutdown occurs in the same way as usual. After turning off the heater, a fault code is issued to the control (in the form of a code of type F11 for controls of type 1531, by blinking of the LED on the switch - slow blinks separated by several fast ones, or a hexadecimal code on Multicontrol controls).

To remove the blockage, the heater must be turned off for at least 2 seconds and turned on again.

Error overview.

For more details, see “Webasto Air Top - error codes.”

Errors such as overheating, startup error and flame failure are stored in the memory of the control unit and, when the maximum possible number is reached, can cause the heater to be blocked.

• • Startup error (FSZ) is counted every time the heater fails to start. If the number of these errors is 9, the heater is blocked (HGV).
• • If the same error (SZ) is repeated more than 5 times, the heater is blocked. (HGV)
• • If overheating (UHZ) occurs more than 5 times, the heater is blocked (HGV)
• • After a flame failure (FAZ), restart is carried out automatically. The reason for this is that the heater was previously in control mode. During a restart, the cycle repeats (ZWZ). This process is repeated until the heater either starts or the number of cycle repetitions reaches 3.
• • In case of flame failure (FAZ), the cycle is automatically repeated (ZWZ). If the cycle (ZWZ) is repeated more than 3 times, the heater is blocked (HGV).
• • Automatic reset: After each heater start, the cycle repeat counter ZWZ is reset to zero. The fault counter during normal operation becomes zero, and the counters for flame failure FAZ, overheating UHZ, unsuccessful starts FSZ after correct operation in combustion mode for more than 6 minutes are reset to zero.

Decoding abbreviations

• ZWZ – cycle repeat counter
• FAZ – flame break
• UHZ - overheating
• FSZ – bad start
• HGV – heater blocking
• SZ – fault counter

Benefits and Features

One of the advantages of this device is that you don’t even need to approach the car to start the system. You can start from the window of your own apartment. Many people love Webasto for its autonomy, and also for the fact that almost no precious energy is wasted from the battery for heating. One of the serious disadvantages is that the battery life is reduced by about a year. But you always have to pay for comfort. When the temperature reaches a certain threshold, and by default this level is 81°, then the control unit will simply turn off the installation. The car will wait for its owner, being completely ready to move. However, if there is no activity for a long time and the temperature begins to drop, then when it reaches 64 degrees, Webasto will start up and begin its work again.

What is Webasto? Distinctive features

Today it is difficult to find a car enthusiast who does not dream of integrating Webasto into his car. Webasto is an autonomous pre-start heater made in Germany. A compact mechanism weighing 5 kg is installed inside the cooling circuit of the vehicle’s on-board network and fuel system. The main function of Webasto is to warm up the engine before starting the power unit. An autonomous heater pump drives antifreeze throughout the cooling network through the radiator. Essentially, the device is a small combustion chamber connected to the vehicle’s cooling system. Today, the manufacturer is bringing two types of devices to the market - Thermo Top Evo-4 and Thermo Top Evo-5 . They differ only in power.

Webasto is also connected to the standard interior heater and starts the fan. Thus, in the cold season, the driver does not need to wait for the engine to warm up. The motor reaches the required temperature with one press of the remote control button. The owner does not need to approach the car; Webasto can be launched from the apartment window. In addition, during a cold start, engine wear is equal to a mileage of 100 km . The heater works autonomously, heating and starting the engine for a long time does not take up a large battery charge. The only obvious downside is that the battery life is reduced by a year. If we take this as a price for convenience and comfort, then changing the battery is not decisive.

Webasto operation in winter

Webasto malfunctions and their elimination

The main malfunctions include the following reasons:

1. The heater does not start;
2. Refusal to work;
3. After starting, the heater stops.

Webasto does not start depending on the quality of the equipment, as well as the quality of the fuel. You need to start from the fact that either there is nothing to set on fire, or there is nothing to burn, and in some cases, both are possible. Poor quality fuel clogs the filter mesh of the fuel pump, resulting in poor dosage, and subsequently a complete lack of supply. Also, poor fuel has a detrimental effect on the spark plug, which becomes heavily coked and stops heating to the required temperature, and then becomes unusable.

In case of failure of the electronic control unit, it is better to contact a service center for diagnostics with special software.

Webasto malfunctions on diesel engines are similar to those for cars with gasoline engines. On a diesel engine, Webasto may not start due to the fact that it is often difficult to find good quality diesel fuel, and the sulfur content is higher than normal, polluting the spark plug even more than gasoline. Accordingly, on a diesel engine it fails faster. Also, with a diesel engine, Webasto does not start in cold weather due to thickening of the fuel, which may simply not reach the supply system into the combustion chamber through the pipeline. Therefore, the fact that Webasto does not start in cold weather is a common problem on cars with diesel engines. Another Webasto malfunction is that the fuel pipe is bent; because of this, fuel will also not be able to flow into the heater. And the most common reasons why Webasto may not work are: clogged fuel grid and unusable glow plug. If Webasto does not turn on, the reason may be a failure of the electronic control unit. And when Webasto starts up at first, then stalls after some time, the problem may also be in the electronics. In these cases, you need to contact a service center, where the heater will be connected to a device with special software and diagnostics will be carried out.

Design and principle of operation

The preheater consists of five components:

1. Electronic control unit;
2. The combustion chamber;
3. Heat exchanger;
4. Circulating pump;
5. Fuel lift pump.

Main components and operation diagram of Webasto

Webasto can be launched both from inside the car and using the control panel from a distance of up to one kilometer.

The fuel booster pump from the fuel tank supplies a portion of fuel to the combustion chamber, which is ignited by a spiral spark plug. There is a heat exchanger in the combustion chamber, which is washed by coolant. The heat exchanger is connected to a small circle of the engine cooling system, and thanks to a circulating pump, coolant circulates through the cooling jacket, which helps warm up the engine faster before starting. And an electronic control unit connected to the engine electronic control unit controls the operation of the heater.

Webasto DBW 2010/2012/2020/2022/300/350

Preliminary diagnostics of faults in engine pre-heaters for Webasto DBW 2010/12, 2020/22 and Webasto 300/350.

Malfunction	Check and repair or replace if necessary
After switching on, the heater does not work.	Electricity supply. Circuit breakers. Electrical wires and connections. Switch. Control block.
The operating mode display goes out after approximately 25 seconds.	Temperature fuse or heat limiter. Flame detector. Control block. Ignition electrodes. Ignition spark source, ignition cable. Drive (motor). Fuel supply. Fuel pump. Fuel solenoid valve. Spray nozzle.
The motor in the heater does not work.	Electricity supply. Circuit breakers. Electrical wires and connections. Heating control thermostat or temperature sensor. Control block. Drive (motor).
Engine in a heater – absence of an initial phase preceding combustion.	Electricity supply. Control block.
The engine is in the heater - no purge after finishing work.	Control block.
Circulation pump does not work.	Electricity supply. Circuit breakers. Electrical wires and connections. Control block. Drive (motor).
There is no ignition spark.	Circuit breakers. Electrical wires and connections. Flame detector. Control block. Ignition spark source, ignition cable.
Combustion – does not start after 15 seconds.	Temperature fuse or heat limiter. Flame detector. Control block. Ignition electrodes. Ignition spark source, ignition cable. Fuel pump. Fuel solenoid valve. Spray nozzle.
Combustion – Combustion stops after 25 seconds.	Electricity supply. Electrical wires and connections. Flame detector. Control block.
Combustion – cannot be turned off.	Switch. Control block. Fuel solenoid valve.
Combustion – with light smoke.	Fuel supply. Fuel pump. Spray nozzle.
Combustion – with dark smoke.	Electricity supply. Electrical wires and connections. Drive (motor). Fuel supply. Combustion air supply. Exhaust gas removal.
The preheater is overheated.	Electrical wires and connections. Temperature fuse or heat limiter. Temperature fuse or heat limiter. Heating control thermostat or temperature sensor. Control block. Spray nozzle. Heating system.

troubleshooting

Operational failures are divided into types:

1. Errors in internal memory . As a rule, they do not affect the operating mode.
2. Spontaneous failures . Autostart or secondary activation is hidden in the device’s circuitry.
3. Shutdown by mistake . There is a problem with the control panel or power supply. The heating turns off on its own without saving the error. The second failure option is when the error persists, but a restart asks for a signal to shut down and restart the system.
4. Webasto blocking . Occurs due to a recurring error. The failure must occur 4-6 times and then the unit is blocked and saves the report. It is impossible to unlock the mechanism yourself; you should contact a service center. Note that if the failure occurs due to low voltage or a damaged battery, there is no blocking.
5. Overheat lockout . When Webasto overheats, the system locks up.
6. Shutdown by mistake due to low or high voltage . When the voltage reaches 11.5V, the mechanism turns off for a while. Afterwards purging occurs. The voltage can be measured using the control unit. When the voltage is too high, it is measured with a heater. Typically, at 16V voltage, work is suspended, shutdown and purging occurs. If the problem is resolved, the system is ready to serve again.

When Webasto does not start, other reasons are determined using Thermo Test PC diagnostics.

Troubleshooting.

The causes of common failures are collected by type:

1. Unsaved errors. First, they check the fuel supply, and only then change the heater or connecting units.
2. Recorded failures. They look at the type of problem in the device memory, the faulty node is shown there. Next, the breakdown is eliminated by replacing the part.
3. General saved failures. When Webasto did not identify the broken part of the system. The first thing they look at is the peripheral parts of the mechanism.
4. View error information using PC diagnostics.

PC diagnostics Webasto

Webasto errors

Diagnostics and reset of Webasto errors on a computer

During heater malfunctions, an error is generated in the control unit, which is stored in the internal memory. When it is faulty, the indicator lamp flashes a specified number of times after a while. Depending on how many times the lamp flashes, this will be the Webasto error code. If you correctly determine this code, you can understand the cause of the malfunction and how to eliminate it.

Webasto fault codes are given in the instructions that come with the heater, which indicates which code corresponds to which fault. After fixing the problem, the Webasto error must be reset, otherwise the device will not start. This is mainly done by connecting the heater to a computer and erasing it through special software.

Resetting errors and unlocking Webasto Thermo-Top C/E

• Disconnect the control unit by removing the 20 A fuse (yellow) on the heater cable harness
• Reinstall the fuse
• Press the “On” button (left) on the “Telestart” remote control or “direct start” (torch) on the timer.
• Disconnect the control unit by removing the 20 A fuse (yellow) on the heater cable harness
• Reinstall the fuse. The heater should turn on.

Also, do not forget that the heater is not blocked just like that, there are always reasons why the heater is blocked. Errors are stored in the control unit’s memory; resetting them will complicate further diagnostics and repairs of your Webasto heater.

DIY repair

In the summer, no one uses this device, because there is no particular need for it. But then the first cold weather arrives, the driver presses the button, but there is no result. And self-diagnosis begins. The driver tries to detect the problem, and often fails. But still, independent repair of Webasto is possible, although the manufacturer recommends that you contact the company’s diagnostic center for any breakdowns. If you understand how the system works and have the necessary knowledge, you can repair the device yourself.

Heater repair and diagnostics

When Webasto does not start after a summer of inactivity, many people think that they can easily repair the system themselves. This is far from true, because, like any other mechanism, the heater has a twisted system. When you don’t understand anything about electrics, it’s worth contacting the company’s diagnostic center - this will save you from heftier costs. If you have an idea about the work of a mechanic and are willing to take a risk, then you should start by familiarizing yourself with the manufacturer’s diagram. Check the simplest parts of the mechanism, perhaps the reason lies there.

Mercedes-Benz E-class Brichka › Logbook › Webasto does not turn on error f87 - solution

Hi all! In the morning I noticed that the webast did not turn on, neither from the phone nor from the remote control in the car, the candle just came on for 5 seconds and went out and no sounds, in an old-style car timer on which it is impossible to diagnose a malfunction

Old style timer

But fortunately in our family we have a couple more Mercs with Webasto and new-style timers

New sample timer with diagnostics

Having connected a more modern timer, I tried to turn it on and got an error.

I started googling what it is

F87 - Permanent blocking of the heater. The heater is permanently blocked. Reset the lock and try to turn on the heater.

The control has an error log and a reboot, so after a reboot the error logs are cleared, I reboot, look at the logs - everything is clean, turn on Webasta again and it gives an error.

I'm calling Misha xxx024

It is advised to turn off the 20A fuse for a while, it is located where the air filter

Full sizeYellow pre 20A

I turn it off for 10 seconds, it didn’t work, again for 30 seconds and the same thing, then I waited for 2 minutes and still the error pops up (every time I had to clear the log before starting)

I started browsing the forums and came across this advice: Good afternoon, you need to do it together. One person removes the cover from the 20A fuse and pulls the fuse out a little so that it can be easily pulled out. The second turns on the boiler and within 3 seconds you need to pull out the fuse and turn off the heater, wait a few seconds and insert the fuse - This is a universal circuit for Thermo TOP EVO. If you have Thermo top C\E\Z

I take a friend, do this tricky procedure with him and webast started working!))

Maybe someone will find this advice useful so as not to go to the Webasta dealer and save their money

How to use Webasto?

In order for the device to serve a long service life, and you do not carry out Webasto diagnostics yourself, you need to follow the attached instructions and tips:

• parts of the mechanism should not come into contact with liquid;
• Parts of the device must not be subject to electrical charges;
• It is prohibited to work in high humidity and temperature;
• turn off the heater at the gas station;
• It is prohibited to use Webasto in closed garages;
• use the fuel recommended by the manufacturer;
• the device should be started occasionally with the engine not warmed up at a lower fan power for about 10 minutes;
• The heater can only work for an hour, so you shouldn’t run it often.

PLANAR D4 error codes

Number of LED blinks	Description of the error
1	Overheat
2	The heater does not start (two automatic start attempts have been exhausted)
3	Flame failure
4	Glow plug malfunction
5	Flame indicator fault
6	Malfunction of the temperature sensor in the control unit
7	Fuel pump malfunction
8	The heater does not start
9	Shutdown, overvoltage over 30.8 V (15 V for 12 V heater)
Shutdown, undervoltage less than 20 V (10.8 for 12 V heater)
10	Ventilation is insufficient to cool the heater combustion chamber
11	Blower motor malfunction

Error with Easystart Timer

Indication	Description	Recommendations for elimination
Wait for automatic recognition to complete, then set the time and day of the week.
The battery is low.	Replace the battery immediately!
No connection.	Check the operation of the heater fuse and replace if necessary.
Malfunction of the heating device 1.	Contact the service center.
Malfunction of the heating device 2.	Contact the service center.
The temperature sensor is faulty.	Contact the service center.

Automatic recognition is enabled.

EasyStart Timer was disconnected from the power supply and then connected again.

Indication	Description	Recommendations for elimination
Wait until automatic recognition is completed, then set the exact time and days of the week.
The device does not respond to commands.	Check the heater fuse and replace it if necessary. Contact the service station.
Malfunction of the heating device 1.	Contact the service center.
Malfunction of the heating device 2.	Contact the service center.
Supply of reduced voltage.	Charge the battery and contact a service center if necessary.
The temperature sensor is faulty.	Contact the service center.

Purchase and installation

You can purchase it in almost any city in the Russian Federation. The seller will always help you decide on the model.

It is best to entrust the installation to qualified service center employees.

If you decide to install the device yourself, then carefully read the installation instructions. Pay special attention to compliance with safety requirements when connecting the fuel supply system. Also be careful when installing the control system and connecting the heater to the vehicle's electrical system.

After installation, before the first start, it is necessary to bleed the vehicle's cooling system, otherwise an air lock will interfere with normal operation. If an air lock forms, the cooling system does not work properly, and the Webasto starts, but does not heat up.

Independent search and problem solving

Fuel . Often problems lie in the fuel supply. This happens in winter, when many drivers forget to change their summer diesel fuel to winter. Look at the heater, it can work in a warm room, so take care of the garage. When the webasto goes away in a warm place, change the fuel. First, drain the diesel fuel, vent the system, clean it, change the filter, pour in new diesel fuel. There is another reason for fuel not entering the heater. The diesel fuel does not reach the pump. The sound is clear and loud. There may also be air leaks when the fuel line is damaged. In addition, you need to check the solenoid valve, there is a build-up of plugs in it. To check the air pressure on the winding, take an ohmmeter. Normal units range from 136-154 ohms . When performing diagnostics, feed any washing liquid into the tube.

Electrical ringing . After checking the fuel system, people who understand electrics move on, and average drivers turn to service professionals. We look at fuses F1-F3, if there are blown ones, we replace them and check for functionality. Next we check the timer. We measure its current in the connector; if there is no current supply, then the timer should be changed completely. The next object of control is the stove. We look at the terminals along the way, when they are oxidized, this can block the current supply. We check the integrity of all wires. Depressurization most often occurs on the plug itself.

Webasto Operating Instructions

We remove the blocks . Webasto may turn on blocking due to the fact that the errors have been corrected, and reports about them have not yet been recorded in the memory panel. We remove power from the control unit for 3 seconds , removing it from the fuse. We take out the chip and return it to its place. Then we turn on the heater. Then we repeat the first two points of the manipulation. If everything went well, the system will work.