DIY webasto repair

In detail: do-it-yourself webasto repair from a real master for the site my.housecope.com.

The Webasto autonomous heater is a very reliable device, but a breakdown can still happen. In most cases, failure is due to improper installation, improper operation, or lack of maintenance.

Most often, the Webasto autonomous heater simply does not turn on in the event of a malfunction, however, with some malfunctions, an abnormal operation of the device is simply observed.

Autonomy Webasto has the following typical faults:

flame breaks;
overheat;
unstable work (for example, startup difficulties).

In the event of a breakdown, the heater will signal its malfunction by showing an error code (a table with codes is presented at the end of the article).

The timer display will show an inscription in the form of the letter F and two numbers (this is the error code).

If there is no timer and there is only a switch, then the switch lamp will give a certain signal (blink code). The light will give 5 short signals and a number of long ones. The number of long beeps is an error code. If the error code is 0, then the light will simply give 5 short beeps.

Also, abnormal operation of the heater may be indicated by extraneous noises during the operation of the device.

The car owner himself can only check the condition of the fuses, as well as visually assess the condition of the heater.

Therefore, if visually all the fuses are intact and all the plugs are in place, then it is necessary immediately contact a specialized service center... To fully diagnose and read errors, you need a special Webasto Thermo Test software, as well as a special programmer and an adapter plug. All this is available only in a specialized service center.

Video (click to play).

Self-repair can damage the heater or the vehicle.

Autonomy Webasto can show the following error codes:

Many people claim that do-it-yourself Webasto repair and diagnostics is a simple thing and accessible to everyone. Don't be gullible: like any device, the heater is a rather sophisticated system. If you are not very friendly with an electrician, it is better not to meddle in a showdown with Webasto: saving $ 10 on the services of specialists (and spending several hours of precious time in combination with several kilometers of nerve cells), you can refurbish to an amount of 40-50 US dollars ...

Experts, however, assure that they receive 50% of their earnings on heaters due to the preliminary intervention of the owners in them. In addition, non-routine work (or complete refusal to function) "Webasto" may be due to the systems associated with it, and not at all to personal whims.

Do-it-yourself repair and diagnostics of "Webasto" should begin with familiarization with the diagram - it is attached to the device by the manufacturer. And if you are not a professional electrician / mechanic, it is better to limit yourself to checking the simplest - they are the most likely - of breakdowns, and with the complex ones, go to the service center.

Problems with the supply of fuel to the heater most often occur in cold weather and indicate that you may have forgotten at the same time to change the summer diesel fuel for the winter one when you changed your car's shoes. If the heater starts working after settling the car in a warm box, change the fuel. No heated garage - connect a canister with the correct winter diesel fuel to Webasto and check if it starts working. If you find the reason, you will have to drain the solarium, blow through the system, clean it, change the cleaning filtration, fill in a new one.

There are also more complex reasons for not receiving fuel at Webasto.

The diesel fuel does not reach the pump itself. In this case, the sounds are voiced, distinct, loud.The most common reason is air leakage due to depressurization of the fuel supply. Therefore, it is necessary to check the pipes;
The solenoid valve can also ensure the absence of diesel fuel in the heater - for example, a plug has formed at the entrance to it. To check, you need an ohmmeter: the resistance on the winding in a normal state should be in the range of 136-154 ohms. For an additional check, you can give a few short pulses to the valve with a frequency of up to 1 hertz and an amplitude between 8 and 11 V. In parallel, a flushing fluid must be given to the tube (carburetor is suitable). In many cases, no further action is required.

Anyone who peacefully gets along with electrical circuits can move on if the failure of "Webasto" is not caused by fuel problems.

Fuses F1-F3 are checked first. The burned-out ones change, the heater's performance is tested. However, if it was installed at the factory and connected to CAN bus, you will have to ring each fuse to the last one. The operation of Webasto is also dependent on controllers that are not included in the design - fuel level sensors, external and also air inside the cabin, collisions, etc.

The next object of control is a timer. The current is measured in the connector. If it is present, but the device is inactive, the timer itself must be replaced.

The power supply in the contacts of the heater stove is checked. At the same time, the terminals are also examined: primitive oxidation can interrupt the current supply, as a result of which Webasto is capricious. At the same stage, all wires are viewed for breaks and frays. A frequent case: almost on the plug itself, the wiring breaks off without external signs, the insulation remains intact. So be attentive and sensitive with your fingers.

We advise only very brave or electricians to delve deeper into the circuit. And the average driver can skip to the last checkpoint.

Diagnostics Webasto (webasto) Thermo Top do it yourself.

What and how can be done on one's own when repairing a wet Webasto stove?

First of all, you should measure your capabilities and experience with the complexity of the task. Therefore - decide whether the task at hand is up to the task. More than 50% of all heaters that get into the repair went through the hands of the owners. Many of them were initially with trifling breakdowns, or were simply blocked by software and did not require mechanical intervention. However, after the repair of the owners, we also had the opportunity to earn money. Do not be among such "repairmen", if in doubt, just carry / take the heater to the service station. Moreover, the failure of the heater may not be caused by the heater itself, but by the associated vehicle systems.

And, if all the same decided on an independent repair - then go ahead.

Let's start with the simplest checks. If the heater stops working in cold weather, then most likely the matter is in the fuel supply system, or rather in the fuel itself. (more information about fuel and its composition can be found in the article). In this case, the check must be carried out in a warm garage in order to exclude the influence of the "summer" solarium on the work of Webasto. It should be noted that similar problems appear even at temperatures of minus 15-18 degrees. You can also connect power from a separate container at the time of the test with a known clean and good winter diesel fuel. In any case, the fuel supply system should be purged and cleaned, the fuel filter should be replaced, and if there is none, put it on.

An indirect sign of the lack of fuel in the power system is the sound of the metering pump. By the way, it must be installed correctly,

If the sound is loud and loud, then perhaps diesel fuel does not enter the fuel pump itself. With "good, correct" operation, the sound is muffled and low. The reason may be a leak in the fuel line, air leaks.

You can check the integrity of the winding itself with an ohmmeter. The winding resistance at 20 degrees should be about 136-154 ohms. The operation of the valve can be checked by applying to it short pulses with an amplitude of about 8-11 volts with a frequency of 0.5-1 hertz.At the same time, flushing fluid, such as carburetor cleaner, is supplied to the tube. Sometimes such a check operation is enough to bring the heater itself to life, if the reason for the refusal was a blockage in the fuel line at the installation site of the solenoid valve.

The next stage of verification is the electrical part. First of all, you should make sure that the F1-F3 fuses are working properly.

Check the presence of supply voltages on the timer (connector X8). If the power comes to the timer, and the last one is "no mu-mu", then there is a reason in it. How to start Webasto without it is described below.

If the heater was factory installed with a CAN bus connection, check ALL literally fuses. Firstly, it will take a little time, and secondly, make sure once again that they are in order, and thirdly, it is not possible to specify a specific fuse for all possible variants of car modifications, even within the same model, well, and fourthly - the operation of the heater also depends on the state of the sensors that are not part of it. For example, from the fuel level sensor, from the outside and interior air sensor, from the collision sensor, from the voltage of the on-board network.

Separately, you should check the power supply at the connectors of the stove itself (X1-X2) - plus and minus and the quality of the contacts. Often, in the most inaccessible places, almost in the plug itself, the wire breaks off or rotates, while the insulation is not externally damaged.

If both power circuits - fuel and electrical - are normal, then the heater can simply be blocked as a result of past errors that have already been eliminated, but are still recorded in the memory of the heater control unit.

The heater can be unlocked in three, now forgotten ways:

3. Unlocking on the recommendation of the manufacturer Webasto. Unfortunately, it does not always work, but nevertheless, there is a chance.

step 1 remove power from the heater control unit for 3 seconds.

step 2 supply power and turn on the heater using timer 1533 or remote control.

step 3 after 3 seconds, turn off the power supply to the heater control unit again

Step 4 After 3 seconds, apply power to the heater control unit.

Judging by the Webasto manuals, everything should work, and, by the way, it often works.

It is checked with an ohmmeter at a temperature of 25 degrees. Resistance of a serviceable element 0.2-0.4 Ohm

It is checked by applying a pulse voltage with an amplitude of 10-12 volts and a frequency of 1-10 Hertz. The resistance of a serviceable pump is 5.2 Ohm at a temperature of 20 degrees. A serviceable pump should provide a volumetric supply of fuel in the amount of 36-45 grams for 3 minutes at a pump activation frequency of 7 Hertz.

It is checked with an ohmmeter at a temperature of 24 degrees. Resistance of a serviceable element is 2-4 Ohm with a complete set No. 1. Resistance of a serviceable element 0.8-1 Ohm with a complete set No. 2

Should work when 12 volts are applied to it. The resistance of a serviceable element is of the order of 10 kOhm. However, you should focus precisely on connecting the power directly.

At 20 degrees, the resistance of the element is 2-4 Ohms.

Overheating sensor

At 20 degrees, the element resistance is 240 ohms.

Resistance of a serviceable element 136-154 Ohm at 20 degrees

In winter, the Webasto autonomous pre-heater is a desirable mechanism for any motorist. The main purpose of Webasto is to warm up the engine before its operational start, so that the driver does not need to wait for warm-up. In addition, the device is connected to the passenger compartment heater, and in cold weather you do not have to get into a cold car. Therefore, if such a useful and, moreover, not cheap, device fails, the car owner is looking for opportunities to repair it as soon as possible. To find out the cause of the malfunction, Webasta diagnostics will be required.

It should be noted that the Webasto autonomous heater is a rather complex device. Handling it requires certain knowledge and skills. In addition, a heater malfunction may not be associated with the device itself, but with other vehicle systems.
Some, not very well versed in electrical devices, try to conduct diagnostics and repair of Webasto do it yourself. Such an attempt can lead to complete damage to the device. And then, instead of the expected savings on repairs in a car service, the car enthusiast will face significant additional costs. If you are confident in your abilities and are ready to take on troubleshooting on your own, you need to start by studying the device diagram included in the delivery kit from the manufacturer.

For those who are not a professional mechanic, it would be most reasonable to limit themselves to Webasto diagnostics and eliminate the most simple and typical breakdowns.

If the diagnostics reveal serious problems, then it is better to contact the service center to fix them.

The following are the causes of common device failures:

Internal memory errors not saved. In this case, first of all, the fuel supply is checked.
Spontaneous crashes. If the device performs autostart or reclosing, the reason for this may be a malfunction in the circuit.
Error shutdown can occur due to malfunctioning of the control panel or electrical circuit. The heating switches off without saving the error. Otherwise, the error may persist, but upon restarting, a signal sounds to indicate that the system is shut down and restarted.
Blocking Webasto. This function is enabled if the error is repeated 4-6 times. When the device is locked, a report is saved. It is almost impossible to unlock the device yourself; it is recommended to contact the service center for this. It should be noted that the lock will not engage if the fault is caused by low voltage or battery failure.
Overheating lock
The device has shut down due to an error caused by low or high voltage. The device will temporarily shut down if the voltage reaches 11.5V. Then the blowdown is started. If the problem is resolved, the system can work again.

Other reasons for disabling Webasto are determined using the adapter for Webasto and Eberspacher diagnostics and the Thermo Test computer program.

To carry out a computer test of the heater, you will need Webasto diagnostic equipment. It includes a universal USB adapter K-Line (to line), a Webasto diagnostic program, as well as two wires with clips and one with a flat contact for connecting the adapter to the heater control bus.
The Webasto diagnostic adapter can be purchased from your specialist retailer. It is required to connect a computer via a USB port to the W-bus connector of the Webasto diagnostic control unit. The converter is designed to control the settings and functions of the car via a computer.
The Webasto Thermo Test (WTT) program allows you to test the operation of the heaters. WTT allows you to read information from the vehicle control unit, search for errors and start the device. You can download the WTT program on the official website of Webasto.
Before starting the diagnostics, it is necessary to select the connected heater from the list of equipment. The control unit selection opens after starting the program.

Webasto Thermo Test program

The Webasto Thermo Test (WTT) software supports almost all diagnosable heaters.

Diagnostics by Webasto K-line adapter is as follows:

Connect all three wires to the adapter on one side. The clips are attached to the battery. The third wire connects to the heater diagnostic wire, which is usually yellow.
Connect adapter to laptop via USB port. In this case, the operating system must itself install drivers for it. If this does not happen, then the drivers can be installed independently. They are included in the scope of delivery from the manufacturer.
Start the installed WTT program and select the model of the pre-heater in the start window.
Run diagnostics. All heater malfunctions will definitely be identified.
If the cause is not in the instrument itself, additional checking of the components is necessary. To do this, open the "Diagnostics / Component Test" section, mark the items to be checked and press "Start".

During all diagnostics, there is a continuous recording of processes with a time stamp. They can be saved and then played back using the functions in the Favorites tab in the WTT Session section. You may need this when contacting technical support for help. Therefore, after the end of the diagnostic procedure, it is imperative to complete the recording to save the results.
If the diagnostics and testing of Webasto found faults, you can contact error code table... If you hover the mouse cursor over the detected error in the list on the laptop screen, a short explanation with recommendations will appear.

The main thing to remember is that incorrect application of the program can lead to failure of the heater, leading to leakage or ignition of fuel. Therefore, for the diagnosis of such complex devices as Webasto, it is better to contact a specialist.

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Most experts are sure that diagnosing and repairing Webasto with their own hands is not so difficult. In fact, not everything is so simple: the heater has a rather intricate device. If a person does not know much about electrics, it is better not to try to do everything on your own. Initially, it seems that on the services of professionals you can save about ten dollars, but if something goes wrong, you can spend about fifty dollars, as well as several hours of precious time. As the experts themselves note, they receive about half of their earnings on heaters solely due to the fact that earlier the owners of the iron horse interfered with the operation of the device. By the way, Webasto may fail not of his own free will, but in connection with the systems related to him.

Do-it-yourself diagnostics and repair of Webasto is still possible, but you have to work hard. It is necessary to start by studying the diagram that the manufacturer applies to the unit. If the driver is not a professional mechanic, the device should be checked for simple breakdowns. As for complex ones, it is better to entrust it to specialists working in service centers.

Interruptions in the supply of fuel to the heater often occur at a time when it is cold outside. They indicate that the driver probably forgot to switch to winter fuel. If, after the machine has stood in a warm room for some time, the device starts to function again, you need to urgently switch to another type of fuel. Can't keep your car warm? Then you should connect a can of winter diesel fuel to Webasto and check whether it will function. If the cause is nevertheless found, you should clean the fuel system of summer solarium, and instead fill in the one that is necessary.

The following reasons are also distinguished due to which fuel does not enter the heater:

Diesel fuel does not enter the pump. In this case, the driver will hear characteristic sounds. The most common reason for this is that air is leaking due to the fact that the fuel line is no longer sealed. You need to perform tube diagnostics.
The heater may not have diesel fuel due to problems with the solenoid valve - a plug has appeared at the entrance to it. In this case, you will have to use an ohmmeter. In working condition, the winding should have a resistance of about 140 ohms. For better diagnostics, it is worth applying a couple of discharges to the valve, the frequency of which is 1 hertz, and the amplitude is 9 volts. At the same time, flush fluid must be supplied to the tube. Usually, you don't have to do anything else.

Anyone who is good at reading electrical diagrams can continue to work. If Webasto stopped working not because of fuel problems, you need to check fuses F1-F3 right away. If they are burnt out, they must be replaced immediately, after which the heater is checked for operability. But only if Webasto is factory-installed, and it was connected to the bus, you will have to ring each of the fuses. The functioning of Webasto depends a lot on the sensors that regulate the fuel level, as well as on the cabin air sensor and several others.

Another element to look out for is the timer. It is necessary to check the current in the connector. If there is one, but the device still does not work, the timer will have to be changed.

It is worth checking the power supply at the heater contacts. You should immediately look at the terminals: they could corny oxidized, which is why Webasto cannot function fully. At this stage, all wires should be checked for breaks and other defects. It is necessary to act as carefully as possible, because a wire defect may be present in the most unexpected place.

You shouldn't go even deeper into the scheme. This can only be afforded by someone who is truly considered a professional. The regular driver can move on.

Webasto may stop working due to the fact that it is blocked due to eliminated, but still remaining in memory errors. It is necessary to act like this:

Disconnect the power supply from the control unit for a couple of seconds by removing the fuse.
When the unit starts working again, Webasto turns on using a remote control or a timer.
Wait a couple more seconds and repeat the previous steps again.

Initially, it may seem that all the manipulations performed do not make much sense, but as practice shows, they still help. Subsequent repair and diagnostic work should not be performed. If nothing written in the article made it possible to deal with the problems, then it is really better to leave it to the professionals. Do-it-yourself Webasto diagnostics and repairs are allowed only within the limits specified above. Sometimes, relying only on your own strength, you can face even greater difficulties.Naturally, you will have to spend an impressive amount, which is not to everyone's liking.

Webasto is an irreplaceable thing in the modern world. Happy owners of such a device avoid serious problems in winter. But as soon as the system disappears, the question arises, why does the webasto not turn on? In the article, we will try to analyze the possible causes of the breakdown, but first we will consider how to use the mechanism correctly so as not to further experience problems with the heater.

Webasto system in the car

Today it is difficult to find a car enthusiast who does not dream of embedding Webasto in his car. Webasto is a German-made autonomous pre-heater. A compact mechanism weighing 5 kg is installed inside the circuit of the on-board network cooling device and the vehicle fuel system. The main function of Webasto is to warm up the engine before starting the power unit. An independent heater pump drives antifreeze throughout the entire cooling network through the radiator. In fact, the device is a small combustion chamber connected to the vehicle's cooling system. Today, the manufacturer brings to the market two types of devices - 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 push of the remote control button. The owner does not need to approach the car, you can launch the webasto from the window of the apartment. Also, on cold start engine wear is equal to a mileage of 100 km... The heater works autonomously, heating and long starting of the engine does not take a large battery charge. The only obvious drawback is that the battery life is reduced by a year. If you take this as payment for convenience and comfort, then changing the battery is not decisive.

Webasto work in winter

In order for the device to serve a long operational life, and you do not diagnose Webasto with your own hands, you need to follow the attached instructions and tips:

parts of the mechanism should not come into contact with liquid;
no electric charges should act on the parts of the device;
it is forbidden to work at high humidity and temperature;
turn off the heater at the gas station;
using webasto in closed garages is prohibited;
use fuel supplied by the manufacturer;
the device needs to be started occasionally with an unheated engine at a lower fan power for about 10 minutes;
the heater can only work for an hour, you should not start it often.

When Webasto does not start after a summer downtime, many believe that they can easily repair the system on their own. This is far from the case, because, like any other mechanism, the heater has a swirling system. When you do not understand anything about electrics, it is worth contacting the company's diagnostic center - this will save you from a more round cost. If you have an idea of \ u200b \ u200bthe work of a mechanic and are ready to take the risk, then you should start by familiarizing yourself with the manufacturer's scheme. Check the simplest parts of the mechanism, perhaps the reason lies there.

One of the varieties of webasto

Work failures are divided into types:

Errors in internal memory... As a rule, they do not affect the operating mode.
Spontaneous crashes... Autostart or secondary inclusion is covered in the device diagram.
Shutdown by mistake... There is a failure in the control panel or power supply. The heating switches itself off without saving the error. The second variant of failure, when the error persists, and restarting asks for a signal to shutdown and to restart the system.
Blocking webasto... Occurs due to a recurring error. The failure must occur 4-6 times and then the unit is locked and saves the report. It is impossible to unlock the mechanism yourself, you should contact the service center. Note that if the malfunctions are due to low voltage or a damaged battery, there is no blocking.
Overheating lock... When the webasto overheats, the system locks up.
Shutdown by mistake due to low or high voltage... When the voltage reaches 11.5V, the mechanism turns off for a while. After that, a purge occurs. The voltage can be measured by the control unit. When the voltage is overestimated, it is measured with a heater. Usually, at 16V voltage, operation is suspended, shutdown and purging occurs. If the problem is resolved, the system is ready to serve again.

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

Elimination of errors.

Common crash causes are sorted by type:

Unsaved errors. First, the fuel supply is checked, and only then the heater or connecting units are changed.
Fixed crashes. They look at the type of problem in the device's memory, a faulty node is shown there. Further, the breakdown is eliminated by replacing the part.
General saved faults. When webasto did not detect the broken part of the system. The first thing to look at is the peripheral parts of the mechanism.
View information about the error using PC diagnostics.

Fuel... Often the problems lie in the fuel supply. This happens in the winter, when many drivers forget to change the summer diesel fuel to the winter one. See the heater, it can work in a warm room, so take care of the garage. When the webasto is gone in a warm place, change the fuel. First, drain the diesel fuel, blow through the system, clean it, change the filter, pour in new diesel fuel. There is another reason for not entering the fuel into 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 an accumulation of plugs in it. To check the air pressure on the winding, we take an ohmmeter. Normal units range from 136-154 ohms... When diagnosing, add any flushing fluid to the tube.

Electrician ringing... After checking the fuel system, people who understand electrics go further, and the average driver turns to service craftsmen. We look at the fuses F1-F3, if there are blown ones, we replace them and check for operability. 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 oxidized, this can block the supply of current. We look at the integrity of all wires. Depressurization most often occurs on the plug itself.

Webasto operating instructions

Removing blocks... Webasto may turn on blocking due to the fact that errors have been fixed, and reports about them did not have time to be recorded in the memory panel. We remove power from the control unit for 3 secondsremoving 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 steps of the manipulation. If everything went well, the system will work.