Do-it-yourself webasto repair on Discovery 3

In detail: do-it-yourself webasto repair on Discovery 3 from a real master for the site my.housecope.com.

Heater WEBASTO blocks its work in case of several startup errors in a row. There is a way to remove the blocking state by manipulating the heater power supply and the control element. Below is the procedure for unlocking the heater Webasto Thermo Top V LAND ROVER vehicles. A sign of blockage is a complete lack of reaction to the heater turning on (provided that the starting conditions are met), or quiet clicks inside the heater after the start command has been given.

To unlock, all the same conditions must be met that are necessary to start the heater in the mode PRE-STARTING HEATERdescribed below. When using the 1533 minitimer, it is advisable to carry out the unlocking procedure together, since it will be difficult to maintain the specified intervals.

Discovery 3, Range Rover Sport cars (up to MY 2010):

engine temperature below +60 ° C;
the car is “sleeping”, that is, the ignition key is removed and more than 11 minutes have passed since the last action with the car;
The battery is not discharged;
there are no problems with the engine coolant level (the level is normal and the level sensor is working properly);
fuse # 28 in the engine compartment fuse block is used to turn off the power to the heater;
the mini-timer 1533 is used to turn on the heater.

Freelander 2 cars before MY 2013:

engine temperature below +15 ° C;
The battery is not discharged;
there are no problems with the engine coolant level (the level is normal and the level sensor is in good working order);
fuse # 32 in the engine compartment fuse block is used to disconnect the heater power;
to turn on the heater, use the Telestart remote control or the 1533 minitimer.

Video (click to play).

Discovery 4, Range Rover Sport 2010-2012 MG, Freelander 2 from 2013 MG, Evoque:

the outside air temperature is below +15 ° C;
engine temperature below +50 ° C;
The battery is not discharged;
there are no problems with the engine coolant level (the level is normal and the level sensor is working properly);
fuse # 32 (Freelander 2 and Evoque) or # 28 (Discovery 4 and RRS) in the engine compartment fuse block is used to disconnect the heater power;
the Telestart control panel is used to turn on the heater.

Procedure for unlocking the Webasto heater

Remove the fuse
Wait 3 seconds
Stick in the fuse
Wait 3 seconds
start the heater (using the button on the mini-timer or on the Telestart remote control)
Wait 3 seconds
Remove the fuse again
Wait 3 seconds
Stick in the fuse

Switch off the heater and switch it on again using the mini-timer or the Telestart remote control. The heater should start. If the heater shows no signs of life again, or clicks very quietly, repeat the procedure.

TT-V is a new line of "Webasto" heaters.
They differ from the classic "C" thermo-topopes mainly in the design of the burner.
Whereas an evaporating ceramic "sponge" was used in older thermo-tops, a nozzle in the form of a cone is used in the V-thermo-top. Hence the letter V - Venturi. Such heaters provide higher efficiency - up to 93%, 20% lighter than old ones, and 1/3 less. They also provide ignition in less than 60 seconds. The burner achieves an air flow rate of up to 50 m / s.
Like the old C thermo-tops, the new thermo-top is reliable and maintenance-free. But from low-quality diesel fuel, it can fail.

The patient is a diesel Land Rover Discovery 3, 2005, with a standard TT-V "preheater". The heater does not turn on, the engine does not warm up, and it is cold in the passenger compartment.
There was no dealer diagnostics at hand, so we use backup paths. In addition to CAN-bus diagnostics, the V thermo-top, like other thermo-topics, is equipped with a data bus - W-bus. This bus is actually a regular standard K-bus. And you can work with it through a regular K-line adapter. The software for work is on the Webasto Data Top disk.
In the description of the program there is a description of the bus contact number for different boiler versions. In this case, this is contact number 2. It can be either empty or with a wire if the machine is equipped with a minitimer or telestart.

We connect the adapter, we connect the mass to the body and to-line to the 2nd contact of the common connector of the heater using a needle.
Launch the program, select W-bus diagnostics.

We look at the errors and the status of the heater. Several errors, including "flame out" and "heater did not start". 3 errors in a row lead to boiler shutdown. The boiler is blocked and does not even start. We erase the errors, the boiler will be unlocked. We select "pumping the fuel line", the duration is 1 minute. Then we start up the boiler using the diagnostic program. The ignition turns on, the boiler starts, but after a short warm-up, it turns off, again with the error "the heater did not start". This means that the flame sensor has not "sensed" the boiler heating up to the required temperature within the allotted time.

There are no other errors. There is nothing to do - we disassemble the heater.
We wait until it cools down, release the pressure in the cooling system, disconnect the wires, hoses, unscrew the fasteners and remove the boiler.
We remove the coolant pipes, decorative covers, disconnect the internal connectors and "half" the boiler.
We take out the burner. In my case, she looked clean and good. There were doubts about the possibility of repair.
We disassemble the burner. Carefully remove the nozzle cover stoppers, take out the nozzle and the spark plug. The candle is absolutely clean and free of deposits. Spill the nozzle with a "break cleaner" and make sure that the fuel flows out of it in an even stream and evenly.
Remove the ceramic nozzle very carefully. half of the gasket will remain on it. We handle the nozzle very carefully so as not to damage the fragile gasket.
Turn the nozzle over and see that the nozzle is half overgrown with coke. Now everything is clear. Where does the Venturi effect come from in such a nozzle.
We clean the coke, returning the nozzle to its original shape, rinse everything with a "break cleaner", blow it with compressed air. We carefully put everything into place. With straight arms and neatness, no spacers are needed.

We put the boiler, connect the hoses and wires.
We start the motor, turn on the circulation pump through the diagnostic program for 1 min. We gas from time to time to fill the boiler heat exchanger with antifreeze.
We turn off the engine, start the fuel pumping mode for 20 seconds. This will fill the pipe in the heater with fuel.
We turn on the air pump for 1 minute. This will allow excess fuel to be blown out of the heater.

We start the heating mode. The start is accompanied by a lot of smoke - this burns out excess fuel and fat residues.
After 3 minutes, it becomes clear that the heater has reached full power, the combustion is even, without "coughing", popping, and interruptions.

We wait for the warm-up, look at the operating parameters, make sure that everything is normal and there are no errors, and turn off the heater.
Disconnect the adapter.

Everything. $ 1000 for a boiler (with no hands at all) or 200 euros for a burner (with partial absence) - you can spend on something else.

Now the engine warms up quickly, the interior is warm. Beauty.

Group: Club Member (100)
Posts: 228
Registration: 18.8.2012
From: Moscow
User #: 44 319

Machine brand:
LR3 / DISCOVERY 3

Do you like the topic? Useful? Share with your friends on social networks:

Group: Club Member (100)
Posts: 327
Registration: 21.5.2013
From: Moscow
User no .: 55 918

Machine brand:
RANGE ROVER 2013

Group: Club Member (100)
Posts: 228
Registration: 18.8.2012
From: Moscow
User #: 44 319

Machine brand:
LR3 / DISCOVERY 3

Group: Club Member (1000)
Posts: 2 689
Registration: 26.2.2012
User #: 38 606

Machine brand:
No car at all

Group: Club Member (1000)
Posts: 2 708
Registration: 13.5.2008
From: East
User no .: 3 029
Number of the car:
056

Machine brand:
LR3 / DISCOVERY 3

Group: Club Member (100)
Posts: 327
Registration: 21.5.2013
From: Moscow
User no .: 55 918

Machine brand:
RANGE ROVER 2013

Are there any problems with her work? Usually there the burner melts and breaks down, you have to change it. Stock up on a can of carbspey or acetone and a small brush to clean and see everything. There is also a problem with the fuel supply needle, but this is much less common! Good luck, nothing complicated there!

For self-diagnosis and unlocking the autonomous system, you will need a regular K-L adapter and the Webasto Themo Test program, you can download it for free on the manufacturer's official website. I have a string, I downloaded the program, I will try the method with a fuse, but there is little hope for this, they write that it only helps percent 10. The main reason why the autonomy is blocked is the low level of fuel in the tank, i.e. in most cases this is when the minimum level light comes on and also less than a quarter of the tank, and I have a quarter of the tank in my car, I'm tired of fighting with my wife for refueling, no matter how much say to hold at least half of the tank, it's useless, in fact, I suppose that the autonomous system was blocked because of this, I searched the tank a couple of times to zero. Well, as I proceed, I will replenish the Temka, today I was planning to do it, I warned my wife that I would drive in another car, uselessly, and flew to Discovery.

VyacheslavVVS LR
Off site
Land Rover Range Rover 3, 2004, of course, gasoline.
Posts: 2996
Thanks received: 1189
Reputation: 68

I will add my own knowledge. for diesel ..
Webasta can be easily opened and just as easily disassembled .. Usually a glow plug dies in it, which is simply called by a tester .. or you throw 12 volts on it and it should glow. as well as a combustion sensor (flame) .. it looks like a glow plug by the way .. hell knows how to check it. didn't do it.
Also (this is in all types, gasoline-diesel), due to time, the grid simply burns out, on which combustion occurs. easy to change, you can pick up in size in truck stores .. even we have them on sale separately)))
Also (again, regardless of the fuel), the pump often dies, which is an error .. the water pump is faint .. The pump works for me, the error still dangles when it wants to .. only today, just an hour ago I watched .. I drop it .. it doesn't matter appears (without even launching). I don’t understand what it’s connected with .. before it disappeared when I was repairing the pump .. or rather replacing it .. since on the Webaste it is not collapsible .. in any case, its electrical part .. the pump part itself changes elementary ..

Well, on gasoline - it starts at any position of the climate switches and, depending on their positions, it warms up the interior. in any weather (launched in the garage, at +24). I don’t know how from the remote control (I don’t have one) from my own radio. in the same place, the time for turning on the autonomous system is set, for this there are 2 timers for turning on at different times, respectively. runs for exactly 30 minutes .. unless it is forced off .. Does not start if the engine temperature is operating.
I started it with a low gasoline level lamp. or when there was actually a liter of two before the light bulb .. I do not remember exactly. I remember that I did not reach the gas station (5 km))))
Everything is checked personally and on my own car ..

In this article, we will tell you about the algorithms for the operation of the Webasto additional heater on Discovery 3 vehicles.

On Discovery 3, only the engine is heated. The interior fan does not start here, as the manufacturer intended. The boiler starts only automatically according to the following algorithm: if the outside air temperature is + 5 ° C or lower, then after starting the engine the Webasto boiler will start and will work as a re-heater. Of course, this is not enough, because the functionality of this boiler also implies pre-heating.

The manufacturer issued a bulletin which meant that it could be retrofitted with a Webasto timer. The timer was set separately, it did not come from the factory. It was installed as a separate option in the service center.

Please note that the boiler will not start and will not work in any of the modes if the climate control is turned off. If the mode is set to "auto", it means that the climate control is on, and the Webasto boiler will work.

There are several nuances in using the Webasto timer on a Discovery 3 car.

The time in the Webasto timer must be up-to-date in real time so that the autostart occurs at the appointed time.

The cost calculator is made for your convenience. He will help you find out the cost of spare parts, the cost of work and the approximate time required to complete the operations you need.

All Land Rover Discovery 3.4 and Freelander 2 diesel cars sold in Russia are equipped with an additional Webasto fuel heater.

This device allows you to warm up your Land Rover engine to the temperature necessary for easy starting even in very severe frost. Also, the absence of "cold" starts of the engine has a very positive effect on its resource.

The second very important function of the Webasto heater is to maintain the operating temperature of the engine to fully heat the interior of your Land Rover. Modern diesel engines are efficient enough and the heat generated into the cooling system during parking or driving in traffic jams is not enough to create a comfortable temperature in the cabin.

On Land Rover cars, the Webasto heater turns on and off when the engine is started. Also, the Webasto heater will turn off when the engine warms up to operating temperature (when the arrow of the temperature gauge is in the middle) and turns on again if the temperature drops again.

Unfortunately, the Webasto heater on Land Rover Freelander 2 and Land Rover Discovery 3 and 4 often fails, which makes the two functions listed above impracticable for the safe and comfortable operation of your car.

The principle of operation of the additional heater Webasto Land Rover.

The principle of operation of the Webasto pre-heater is perfectly shown in a small video clip below. The video is made very cool and understandable, so I recommend that you spend one and a half minutes to watch it.

I will describe in a nutshell how the Webasto Land Rover heater works. A special fuel pump on a separate fuel line picks up fuel from the tank, atomizes and ignites in the combustion chamber. The flame heats up the heat exchanger, through which the engine coolant is driven by a special electric pump. During the passage through the heat exchanger, the liquid heats up. Then the fluid is fed back into the system, thereby heating the engine and the radiator of the interior heater. Combustion products are discharged through a special muffler under the vehicle.Another very interesting video about what is happening inside the Webasto heater.

The second common reason for a non-working heater is the failure of the Webasto Land Rover burner. Goler Webasto Discovery 3 and 4 and Freelander 2 fail due to clogging, overheating and damage to the combustion chamber. Failure is accompanied by a strong increase in heater smoke. In this case, the burner must be replaced.Unfortunately, it cannot be repaired.

Repair of Webasto Land Rover. Replacing the burner for Webasto Land Rover Freelander 2 and Discovery 3 and 4.

Repair of Webasto Land Rover, as a rule, consists in replacing the Webasto burner. Replacing the Webasto Land Rover burner means removing the heater from the car and disassembling it completely. Due to the high probability of Webasto's fire as a result of unprofessional repairs, this work can only be trusted by specialists with experience in carrying out these works. A set of disposable rubber gaskets must be changed with the burner. After assembling and installing the heater, the coolant lost during removal must be added back to the car, and air plugs are removed from the cooling system. For the repair of Webasto Land Rover you get a year of warranty.

Webasto Land Rover repairs are provided with a one-year warranty with no mileage limitation!

Powerful off-road vehicles Land Rover Discovery 3 and 4 enjoy well-deserved popularity among Russian motorists, but quite often in our winter conditions, car owners may have problems with starting a diesel engine. The use of a special Webasto heater will reduce all startup problems to a minimum.

This system heats up the engine elements, which increases their durability, since the main wear of moving parts occurs at low temperatures. The heater is powered from the fuel tank, but the heater burner is designed in such a way that it consumes very little fuel. After the engine has started, the Webasto heating system switches to economy mode and performs the function of heating the interior of Land Rover Discovery 3 and 4.

Warming up the engine before starting

Quick release to maximum power

Reduced start-up fuel consumption

Interior glass does not fog up

You can turn on the Webasto system with a remote radio control, which operates at a distance of up to 1000 meters, or from the passenger compartment, using a programmable timer. Many users prefer to turn on the heating system via a mobile phone, on which it is enough to install the required application.

The disadvantage of the preheating system is the impossibility of manual control after it is turned on. The device goes into autonomous mode, maintaining the optimum temperature automatically using temperature sensors. The system itself is quite reliable, but some of its elements may fail. If it suddenly becomes uncomfortable in the Land Rover Discovery salon, you should immediately go to a car service and carry out diagnostics.

The most common problem is associated with the operation of automation. The Webasto heater controller is programmed in such a way that when the fuel level in the tank is low, it turns off the heating system and completely blocks it. Unauthorized release of the lock is excluded. This can only be done under the terms of service. This blocking is provided not only to save fuel, but also to exclude the possibility of fire. At low fuel levels, the nozzle does not work evenly, which can cause a fire.

Of mechanical failures, in the first place is the malfunction of the injector. Most often this happens when filling a tank with low-quality fuel, which is often the case at domestic gas stations. At the same time, smoke emission increases noticeably. Such fuel emits a lot of soot during combustion, which becomes the cause of burner clogging. The burner cannot be repaired, since it is non-separable, so in case of clogging it will have to be replaced.

In the Webasto system, there may be the following defects that are determined during the diagnostic process:

Her mechanical damage

Temperature sensors malfunction

Open or short circuit in the wiring

In order to replace the nozzle, it is necessary to remove the entire heater assembly. It is located in the front and on the right. When replacing a burner, it is common to change all seals.During the dismantling process, a small problem may arise due to the fact that under the influence of high temperature the fastening bolts are welded to the seats, which makes it difficult to remove them using a conventional tool. In this case, you have to use a drill and drill out the bolt heads. After the nozzle is replaced, the unit is installed in place.

Read also: DIY LED driver repair

With the help of diagnostics, the following defects can be detected:

Burner clogged
Mechanical deformation of the nozzle
Fan failure
Temperature control system failure
Open or short circuit in the wiring
Malfunction in the electronics unit

In order to replace the burner, it is necessary to completely remove the heater assembly.This changes all the gaskets. Some difficulties may arise in the process of removing the block. The fact is that the fastening bolts are welded to the holes due to the high temperature. In this case, the bolts are removed with a drill using a drill. After that, the threads should be cleaned.

The unit with the new burner is put in place and secured with new bolts. To remove air locks, antifreeze is poured into the system and the system is pumped. Temperature sensors play an important role in the control system, so when they fail, the system is completely blocked.

All work on the Webasto Discovery 3 and 4 heater is carried out only by experienced specialists, since the slightest inaccuracies in work can lead to a fire.

Our service employs high-level specialists. We use the most modern diagnostic and auxiliary equipment and components from trusted suppliers. After completing the work and testing, we issue a one-year warranty.

In order to make it easy to understand how the preheating system works, Webasto has prepared a video that is recommended for everyone to watch:

If you liked the video about the design of the Webasto parking heater installed on Land Rover Discovery 3 and 4 cars, watch another video about the harsh field tests.What happens inside the WEBASTO boiler?