Vaillant VU GB 806/5-5 User manual

Operating instructions
For the operator
GB, IE
Operating instructions
ecoTEC
Gas-fired wall-hung high-efficiency boiler

Table of contents
2Operating instructions ecoTEC plus 0020134822_01
Table of contents
1 Notes on the documentation .....................................3
1.1 Storing documents ..........................................................3
1.2 Applicability of the instructions...................................3
1.3 Identification plate........................................................... 3
1.4 CE label...............................................................................3
1.5 Benchmark.........................................................................3
2 Safety.................................................................................4
2.1 Safety and warning information ..................................4
2.2 Intended use......................................................................4
2.3 General safety information............................................5
3 Description of devices and functions......................7
3.1 Design ................................................................................. 7
3.2 Function..............................................................................7
3.3 Hot water production with domestic hot water
cylinder...............................................................................7
4 Operation ..........................................................................8
4.1 Overview of the controls................................................8
4.2 Digital Information and Analysis System (DIA) ........8
4.3 Operating concept ...........................................................9
4.4 Basic display.................................................................... 10
4.5 Operating levels ............................................................. 10
4.6 Preparing for start-up.....................................................11
4.7 Setting the heating flow temperature.......................13
4.8 Hot water generation.....................................................14
4.9 Setting a room thermostat or weather
compensator ....................................................................14
4.10 Switching off the functions of the boiler..................14
4.11 Protecting the heating installation against frost....16
5 Troubleshooting .............................................................17
5.1 Reading fault messages ................................................17
5.2 Reading fault codes....................................................... 18
5.3 Detecting and rectifying faults................................... 18
5.4 Rectifying low water pressure .....................................19
5.5 Resolving ignition faults................................................19
5.6 Service message ........................................................... 20
5.7 Resolving faults in the air/flue gas duct ................ 20
6 Auxiliary functions..................................................... 20
6.1 Operation in the menu................................................. 20
6.2 Displaying the Live monitor
(current status of the boiler).......................................22
6.3 Setting the display contrast........................................22
6.4 Setting the language.....................................................22
6.5 Displaying contact data for the competent
person...............................................................................23
6.6 Displaying the serial number and article number.23
6.7 Reset burner off time
(resetting burner anti-cycling time) ..........................23
7 Service.............................................................................23
7.1 Servicing the boiler.......................................................23
7.2 Caring for your boiler ...................................................23
8 Decommissioning .........................................................24
8.1 Disposing of the boiler .................................................24
8.2 Disposing of the packaging .........................................24
9 Manufacturer's guarantee and
Vaillant customer services.......................................24
9.1 Factory guarantee..........................................................24
9.2 Vaillant Service...............................................................24
10 Glossary ..........................................................................25
Index ...........................................................................................26
Brief operating instructions ....................................................27

Notes on the documentation
Operating instructions ecoTEC plus 0020134822_01 3
1
1 Notes on the documentation
The following instructions are intended to guide you
throughout the entire documentation. Other documents
apply in addition to these operating instructions.
We accept no liability for any damage caused by failure to
observe these instructions.
Other applicable documents
When operating the ecoTEC plus, you must observe all
operating instructions that are included with other compo-
nents of your system.
These operating instructions are included with the individ-
ual components of the system.
Further instructions for all accessories and controllers used
also apply.
The benchmark checklist for starting up gas-fired boilers
(contained in the installation instructions) must be com-
pleted by the Health and Safety Executive-approved heating
specialist company and/or the competent person present
during the commissioning and must be passed on to the
system operator. After reading through these instructions, if
you have any questions regarding the operation of the
boiler, please contact your recognised Health and Safety
Executive-approved heating specialist company or Vaillant's
technical department.
In these instructions, the heating specialist company and
competent person approved by the Health and Safety Exec-
utive will be abbreviated as the heating specialist company
and competent person.
1.1 Storing documents
>Store these operating instructions and all other applica-
ble documents in such a way that they are available
whenever required.
1.2 Applicability of the instructions
These operating instructions apply exclusively to boilers
with the following article numbers:
Unit Type designation Article number
ecoTEC plus VU GB 806/5-5 0010010767
ecoTEC plus VU GB 1006/5-5 0010010780
ecoTEC plus VU GB 1206/5-5 0010010791
1.1 Type overview
To find out the article number of your boiler, refer to the
identification plate.
1.3 Identification plate
The identification plate of your Vaillant ecoTEC plus boiler
is attached at the factory to the underside of your boiler.
The seventh to sixteenth digits of the serial number on the
identification plate represent the article number.
1.4 CE label
The CE label shows that the units comply with
the basic requirements of the applicable direc-
tives as stated on the identification plate.
1.5 Benchmark
iVaillant Ltd. supports the Benchmark Initiative.
A benchmark checklist for commissioning floor-
standing gas-fired boilers is attached to these
installation instructions. It is very important that
this document be filled out properly when
installing, commissioning and handing-over to
the system operator.

4Operating instructions ecoTEC plus 0020134822_01
a
Safety
a2
2 Safety
2.1 Safety and warning information
>When operating your boiler, observe the general safety
information and the warning notes that appear before
each action.
2.1.1 Classification of warnings
The warning notes are classified in accordance with the
severity of the possible danger using the following warning
signs and signal words:
Warning signs Signal
word
Explanation
aDanger!
Immediate risk of death or
risk of severe personal
injury
eDanger!
Risk of death from electric
shock
aWarning!
Risk of minor personal
injury
bCaution!
Risk of material or environ-
mental damage
2.1 Meaning of warning signs and signal words
2.1.2 Structure of warnings
Warning signs are identified by an upper and lower separat-
ing line and are laid out according to the following basic
principle:
aSignal word!
Type and source of danger.
Explanation of the type and source of danger
>Measures for averting the danger
2.2 Intended use
The Vaillant ecoTEC plus boilers are state-of-the-art appli-
ances which have been constructed in accordance with rec-
ognised safety regulations. Nevertheless, there is still a risk
of injury or death to the operator or others or of damage to
the boiler and other property in the event of improper use
or use for which it is not intended.
This boiler is not designed to be used by persons (including
children) with limited mental and sensory capabilities or by
persons who do not have enough experience and/or knowl-
edge, unless they are supervised by a person who is respon-
sible for their safety or they have been instructed by him/
her about how to use the boiler.
Children must be watched to ensure that they do not play
with the boiler.
The boiler is intended for use as a heater in closed hot
water central heating installations and hot water genera-
tion.
The use of the ecoTEC plus in vehicles, such as mobile
homes and caravans, is not classed as intended use. Units
that are not classed as vehicles are those that are installed
in a fixed and permanent location and that do not have any
wheels (fixed installation).
Any other use, or use beyond that specified, shall be con-
sidered improper use. Any direct commercial or industrial
use is also deemed to be improper.
The manufacturer or supplier is not liable for any damage
resulting from such use. In this case, the user alone bears
the risk. Intended use includes:
– observance of accompanying operating, installation and
maintenance instructions for the Vaillant product as well
as for other parts and components of the system
– installation and assembly in accordance with the unit
and system approval
– compliance with all inspection and servicing conditions
listed in the instructions.
Caution
Any improper use is forbidden.

Operating instructions ecoTEC plus 0020134822_01 5
aSafety a
2
2.3 General safety information
>Observe the following safety instructions at all times.
Installation and settings
The boiler must only be installed by a suitably qualified
competent person. The existing regulations, rules and
guidelines must be observed when doing so.
This person is also responsible for inspection, maintenance
and repairs to the boiler, as well as alterations to the gas
volume setting.
What to do if you smell gas in buildings
Installation errors, damage, manipulation, unauthorised
installation sites or similar can cause gas to escape and
result in a risk of poisoning and explosion. If there is a smell
of gas in the building, proceed as follows:
>Avoid rooms that smell of gas.
>Open all accessible doors and windows fully and ensure
adequate ventilation.
>Avoid the use of naked flames (e.g. lighters, matches).
>Do not smoke.
>Do not use any electrical switches, mains plugs, door-
bells, telephones or other intercommunication systems in
the building.
>Close the gas meter isolator device or the main isolator
device.
>If possible, close the gas isolator cock on the boiler.
>Warn other occupants in the building by calling out or
banging on doors or walls.
>Leave the building.
>If you can actually hear gas leaking, leave the building
immediately and ensure that others do not enter the
building.
>Alert the fire brigade and police when you are outside
the building.
>Use a telephone outside the building to inform the emer-
gency service department of the gas supply company.
National phone number for gas emergencies:
0800 111 999
2.1 Close the gas isolator cock
What to do in an emergency if you smell flue gas
Installation errors, damage, tampering with the unit, unau-
thorised installation sites or similar can cause flue gas to
escape and result in a risk of poisoning. If there is a smell of
flue gas in the building, proceed as follows:
>Open all accessible doors and windows fully and ensure
adequate ventilation.
>Switch the boiler off.
>Inform a heating specialist company.
Explosives and highly flammable substances
The risk of explosion arises from the flammable mixture of
gas and air. Take note of the following:
>Do not use or store explosive or highly flammable sub-
stances (such as petrol or paint) in the same room as the
boiler.
Preventing scalding
There is a risk of scalding at the hot water draw-off points if
the hot water temperatures are greater than 60°C. Young
children and elderly persons are particularly at risk, even at
lower temperatures.
>Select the temperature so that nobody is at risk.
Preventing material damage due to unauthorised
changes to the appliance.
Take note of the following:
>Never interfere or tamper with the boiler or other parts
of the heating installation.
>Never try to carry out maintenance work or repairs on
the boiler yourself.
>Do not damage or remove any seals on components.
Only suitably qualified competent persons or our customer
service may alter sealed components.
Material damage caused by corrosion
To prevent corrosion on the boiler and also on the flue gas
installation, note the following:
>Do not use any sprays, solvents, chlorinated cleaning
agents, paint, adhesives or similar substances in the
vicinity of the boiler.
Under unfavourable circumstances, these substances may
cause corrosion.
Preventing frost damage
If there is a power cut, or if the room temperature is set too
low in individual rooms, it cannot be ruled out that sections
of the heating installation may be damaged by frost.
>If you are going to be away during a cold period, ensure
that the heating installation remains in operation and
that the rooms are sufficiently heated.
>Always observe the information on frost protection pro-
vided in (¬section 4.11)
Even if rooms, or the whole dwelling, are not in use for cer-
tain periods, the heating must remain in operation.

6Operating instructions ecoTEC plus 0020134822_01
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Safety
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Caution.
Frost protection and monitoring devices are only active
while the boiler is connected up to the power supply. The
boiler must be connected to the power supply. The boiler
must be switched on. You can see from symbols and/or text
in the display that the boiler is switched on.
Caution.
>Under no circumstances should you add frost protection
agents (or other additives, e.g. jointing compounds, cor-
rosion protection agents, etc.) to the heating water with-
out first consulting your qualified competent person.
Otherwise, it could result in damage to seals and dia-
phragms as well as noise during heating mode. Vaillant
assumes no liability for this or any consequential dam-
age.
Another way to protect the heating installation and the
boiler from frost is to drain them. In doing so, you must
ensure that the heating installation and boiler are com-
pletely drained.
>Contact your approved heating specialist company for
advice on this.
Maintaining operation with an emergency power
generator in the event of a power cut
Your recognised heating specialist company connected your
boiler to the power mains during installation.
If the electricity supply is cut, it is possible that parts of the
heating installation may become damaged by frost.
If you want to maintain the operation of the boiler during a
power cut using an emergency power generator, take note
of the following:
>Make sure that the technical values of this generator
(frequency, voltage, earthing) match those of the power
mains.
>Contact your approved heating specialist company for
advice on this.
Changes to the boiler's environment
You must not make any changes to the boiler's environ-
ment:
>Never shut down the safety devices.
>Do not tamper with any of the safety devices.
>Do not make any changes:
– to the boiler
– to the gas, air, water and electricity supply lines,
– to the entire flue gas installation,
– to the entire condensate drain system,
– to the expansion relief valve or the drain line or
– to constructional conditions that could affect the
operational reliability of the boiler.
Cabinet-type cladding
>If you require cabinet-type cladding for your boiler, con-
sult an approved heating specialist company. Do not,
under any circumstances, enclose your boiler yourself.
Enclosing the boiler in cabinet-type cladding requires com-
pliance with the special design instructions.
What to do if there are leaks in the hot water pipes
Take note of the following:
>In the event of leaks, immediately close the cold water
stop valve in the domestic hot water pipework between
the boiler and the draw-off points.
>Have the leak repaired by an approved heating specialist
company of your choice.
With Vaillant ecoTEC plus boilers, the cold water stop valve
is not included in the scope of delivery of your boiler.
>Ask your competent person where he fitted the cold
water stop valve.
Preventing damage caused by low system pressure
in the heating installation
To prevent the heating installation being used when the
amount of water is too low and to therefore prevent any
subsequent damage that may be caused by this, note the
following:
>Check the filling pressure of the heating installation at
regular intervals.
>Always observe the information on filling pressure pro-
vided in ¬section 4.6.3.
Requirements for the installation site
It is not necessary to keep a clearance between the boiler
and combustible materials or components because, at the
nominal heat output of your boiler, the temperature on the
surface of the housing is always lower than the maximum
permissible temperature of 85 °C.

Description of devices and functions
Operating instructions ecoTEC plus 0020134822_01 7
3
3 Description of devices and functions
3.1 Design
1
3
2
3.1 Front view of the ecoTEC plus
Key
1 Controls
2 Plate with serial number on the rear
2 Front flap
The controls for your boiler are arranged behind the front
flap.
To access the controls, open the front flap as follows:
>Take hold of the recessed handle in the front flap.
>Fold down the front flap.
3.2 Function
Your Vaillant ecoTEC plus is a gas-fired wall-hung high-effi-
ciency boiler, which generates heat for heating and/or hot
water production.
VU boilers can be operated together with a domestic hot
water cylinder, which stores a larger volume of hot water.
3.2.1 Heating mode
In Heating mode, the boiler heats the hot water and sends
it through the radiators or underfloor heating of your home
(heating circuit). The hot water pumped into the heating cir-
cuit exits the boiler at a specific heating flow temperature,
emits its heat into the rooms and flows back into the boiler
once cooled to return temperature. The heating water is
then heated again.
3.3 Hot water production with domestic hot
water cylinder
1
3.2 Drawing hot water
When you open a hot water valve (1) (sink, shower, bath,
etc.), the hot water is taken from the domestic hot water
cylinder.
Cold water than flows into the domestic hot water cylinder
in its place. If the hot water temperature in the domestic
hot water cylinder falls below the value set, then the boiler
operates automatically and reheats the domestic hot water
cylinder. As soon as the water in the domestic hot water
cylinder has reached the set temperature, the boiler
switches off.

Operation
8Operating instructions ecoTEC plus 0020134822_01
4
4 Operation
4.1 Overview of the controls
1234
5
4.1 ecoTEC plus controls
1On/off button for switching the boiler on or off
2Controller (accessory)
The Digital Information and Analysis System
consists of:
3Fault clearance key to clear certain faults
4Operating buttons
5Display
4.2 Digital Information and Analysis System
(DIA)
The ecoTEC plus boiler is equipped with a Digital Informa-
tion and Analysis System (DIA system). This consists of a
display showing symbols and plain text, along with 5 opera-
tion buttons. This system provides information on the oper-
ating status of your boiler and helps you deal with prob-
lems.
The display lights up,
– if you switch the boiler on or
– if you press a button for the DIA system when it is
switched on. At first, pressing this button does not trig-
ger any other function.
The light automatically switches off after one minute if you
do not press any button.
50
F.0 1 1
2
3
4
8
7
6
5
4.2 DIA system with possible symbol displays
1Display indicating the current heating flow tempera-
ture, the filling pressure of the heating installation,
the operating mode, a fault code or other additional
information in plain text
2Display of the current configuration of the right-hand
selector button (after switching on the boiler and in
the basic display: = heating temperature)
3Left and right-hand selector buttons
Left-hand selector button: "Process water" for
selecting and calling up the water temperature.
Right-hand selector button: "Heating mode" for
selecting and calling up information, such as the
heating temperature and water pressure in the
heating circuit, for example
4Minus and plus button
5Maximum output mode (for chimney sweeps only)
6Access to the menu for additional information
7Display of the current configuration of the left-hand
selector button (after switching on the boiler and in
the basic display: = hot water temperature set-
ting)
8Display of the symbols for the active operating status

Operation
Operating instructions ecoTEC plus 0020134822_01 9
4
Displayed symbols
Flame:
Permanently on: Correct burner operation; burner
on
Display of the current burner modulation rate (bar
graph display)
Display of the current filling pressure of the heating
installation (bar graph display).
The filling pressure must be in the mid range
between the two dotted lines.
Permanently on: The filling pressure is within the
permitted range.
Flashing: The filling pressure is outside of
the permitted range.
Heating mode active
Permanently on: Heating mode heat requirement
Flashing: Burner on in Heating mode
Hot water generation active
Permanently on: Time period activated for hot
water generation
Flashing: Domestic hot water cylinder is
being heated, burner on
Maintenance required. In the "Live monitor", you
can read further information about the reason for
the service (¬section 6.2).
Additional symbols:
Summer mode active
Heating mode is switched off
Burner anti-cycling time active
This function is used to prevent frequent on/off
operations, and therefore contributes to prolonging
the life of your boiler. The symbol also appears if
the boiler is in a waiting period.
F.X X
Fault in the boiler. Appears instead of the basic dis-
play (¬section 4.4).
A plain text display explains the displayed fault
code.
Example; F.10 Flow NTC short circuit.
4.3 Operating concept
You can operate the boiler using the selector buttons and
the plus/minus buttons.
Both selector buttons have a soft key function. This means
that their function may change.
45
DHW temperature
Back
4.3 Display after pressing the left-hand selector button
If, forexample, you press the left-hand selector button in
the basic display (¬section 4.4), the current function
switches from " " (hot water temperature) to "Back".
With the left-hand selector button :
– you can navigate directly to set the hot water tempera-
ture
– you can cancel the change to a set value or the activa-
tion of an operating mode
– you can go one selection level higher in the menu
With the right-hand selector button :
– you can navigate directly to set the heating flow temper-
ature and to the precise value of the water pressure of
the heating installation
– you can confirm a set value or the activation of an oper-
ating mode
– you can go one selection level lower in the menu

Operation
10 Operating instructions ecoTEC plus 0020134822_01
4
With both selector buttons + at the
same time:
– you can navigate to the menu (¬section 6)
With the minus button or the plus button
:
– you can go back and forth between the individual points
of the entry list in the menu
– you can increase or decrease a selected set value
Adjustable values are always displayed as flashing. You
must always confirm a change to a value. Only then is the
new setting saved.
You always have the option to cancel the change to a set-
ting or the reading of a value by pressing the left-hand
selector button.
Menu
Water pressure
Live Monitor
Information
Back Select
4.4 Selecting a list entry in the menu
A highlighted object is indicated in the display by the
selected value flashing.
iIf you do not press any buttons for more than 15
minutes, the display returns to the basic display.
Changes that are not confirmed will not be
applied.
4.4 Basic display
50
4.5 Basic display
In the normal operating status, you can see the basic dis-
play in the display. The basic display shows the current sta-
tus of the boiler. If you press a selector button, the relevant
activated function is displayed in the display. If the display
becomes dark, the light is switched on by the first press of
the button. In this case, to trigger the button function, you
must press the button again.
You can switch back to the basic display by:
– pressing the left-hand selector button and exiting the
selection levels
– not pressing any button for longer than 15 minutes.
Changes that are not confirmed will not be applied.
If there is a fault message, the basic display switches to a
plain text display of the fault message.
From the basic display, you can directly change and read
the most important settings and information by pressing
the selector buttons.
The functions that are available depend on whether a con-
troller is connected to the boiler.
4.5 Operating levels
The boiler has two operating levels.
Operating level
The operating level for the operator offers you the most
frequently used setting options that do not require any spe-
cial prior knowledge and displays the most important infor-
mation. You can access additional information using a
menu.
Competent person level
The operating level for the competent person must only be
operated with expertise and is therefore protected by a
code. This level is used by the competent person to adjust
the parameters for the boiler to the heating installation.