Vaillant ecoTEC exclusive 835

Other manuals for Vaillant ecoTEC exclusive 835

Installation And Maintenance Instructions72 pages

Questions and Answers

F
ffosterAug 20, 2025
How to fix a Vaillant ecoTEC exclusive 835 that won't start, resulting in no hot water and cold heating?
- B
  Brent HudsonAug 20, 2025
  To fix a Vaillant Boiler that isn't starting, resulting in no hot water and cold heating, consider these steps: * Ensure the gas isolator cocks are open. * Check that the cold water stop valve is open. * Verify the power supply by checking the fuse. * Confirm the boiler is switched on. * Adjust the heating flow and hot water temperatures. * If the system pressure is low (F.22), fill the installation. * If there is air, have the system purged. * For fault F.28 after failed ignitions, press the reset button and if it persists after three attempts, consult a professional.
J
John DayAug 25, 2025
Why is my Vaillant ecoTEC exclusive 835 not igniting and showing fault code F.28?
- C
  craig40Aug 25, 2025
  If your Vaillant Boiler is not igniting and displays fault code F.28 after three unsuccessful attempts, press the reset button for one second to initiate another attempt to ignite the flame. If the ignition fault persists after three reset attempts, it is recommended to consult a competent person.
P
Patrick BrownAug 28, 2025
Why my Vaillant Boiler doesn't start and shows fault message F.28?
- E
  Erik RiceAug 28, 2025
  If your Vaillant Boiler doesn't start and displays fault message F.28, it indicates that the product switched to fault mode after three unsuccessful ignition attempts. To resolve this, press the fault clearance key for one second to initiate another ignition attempt. If the issue persists after three attempts, it is recommended to consult a qualified technician.
A
Alexander GarciaAug 31, 2025
Vaillant ecoTEC exclusive 835 Boiler not starting: how to troubleshoot no hot water and cold heating?
- Z
  zkerrAug 31, 2025
  If your Vaillant Boiler isn't starting, and you're experiencing no hot water and cold heating, here's how to troubleshoot: First, check that both the on-site gas isolator cock and the product's gas isolator cock are open. Also, make sure the cold water stop valve is open. Verify the building's power supply by checking the fuse. Ensure the product is switched on. Check that the heating flow and hot water temperatures aren't set too low. If the system pressure is insufficient (F.22), fill the heating installation. If there's air in the system, have it purged. Finally, if fault F.28 appears after three failed ignition attempts, press the reset button and consult a professional if the issue persists after three resets.
R
rparkerSep 4, 2025
What causes a Vaillant Boiler to fail to start, resulting in no hot water and heating remaining cold?
- C
  Christopher RuizSep 4, 2025
  A Vaillant Boiler might fail to start, resulting in no hot water and cold heating, due to several potential causes. These include: 1. Closed gas isolator cocks (on-site and/or on the product). 2. A closed cold water stop valve. 3. A disconnected power supply in the building. 4. The product being switched off. 5. Heating and/or hot water temperatures set too low. 6. Insufficient system pressure (low water pressure, indicated by fault message F.22). 7. Air in the heating installation. 8. The product entering fault mode after three unsuccessful ignition attempts (fault message F.28).
L
Linda VincentSep 8, 2025
What to do if my Vaillant Boiler does not start, with no hot water and cold heating?
- C
  Claudia KellySep 8, 2025
  If your Vaillant Boiler doesn't start, resulting in no hot water and cold heating, several factors could be the cause. First, check if the gas isolator cocks (both on-site and on the product) are open. Also, ensure that the cold water stop valve is open. Verify that there is power supply to the building by checking the fuse. If the power supply is okay, make sure the boiler is switched on. It's also possible that the heating flow temperature or hot water temperature is set too low; adjust accordingly. Finally, insufficient system pressure or air in the heating installation might be the issue. In the first case you need to fill the heating installation. In the second case you should contact a qualified technician to purge the heating installation.
G
ghernandezNov 12, 2025
What to do if my Vaillant Boiler doesn't start, with no hot water and cold heating?
- A
  Alan WrightNov 12, 2025
  If your Vaillant Boiler isn't starting, resulting in no hot water and cold heating, several factors could be at play. First, ensure that both the gas isolator cock installed on-site and the gas isolator cock on the product are open. Next, verify that the cold water stop valve is open. Check the fuse in the building to ensure the power supply is connected. Also, confirm that the product is switched on. Make sure that the heating flow temperature and hot water temperature are not set too low. If the system pressure is insufficient (indicated by fault message F.22), fill the heating installation. If the issue persists, there might be air in the heating installation, which requires purging by a professional. Finally, if the product displays fault message F.28 after three unsuccessful ignition ...
E
Erica TurnerNov 15, 2025
Why is my Vaillant Boiler not providing hot water and the heating remains cold?
- S
  samantha96Nov 15, 2025
  If your Vaillant Boiler isn't providing hot water and the heating remains cold, it could be due to several reasons. Check if the gas isolator cock installed on-site and/or the gas isolator cock on the product is closed and open them. Ensure the cold water stop valve is open. Verify that the power supply in the building is connected by checking the fuse. Confirm that the product is switched on. Also, check if the heating flow temperature and hot water temperature are not set too low. Insufficient system pressure, indicated by fault message F.22, can also cause this issue, so fill the heating installation. Air in the heating installation may also be the cause. In this case, have your competent person purge the heating installation. If the product displays fault message F.28 after three unsuc...

Summary

Safety

Action-related warnings

Classifies warnings by severity using symbols and signal words.

Intended use

Defines the product's purpose as a heat generator for heating and hot water systems.

General safety information

Covers general safety guidelines, installation requirements, and operational hazards.

Notes on the documentation

Observing other applicable documents

Advises users to observe all operating instructions enclosed with system components.

Storing documents

Instructs users to keep the manual and other documents safe for future use.

Validity of the instructions

Specifies that the instructions apply only to the listed product article numbers.

Product description

Product design

Details the physical design and components of the product, with diagrams.

Control elements

Identifies and describes the main control elements on the product's panel.

Operator control panel

Explains the functions of the operator control panel and its display elements.

Displayed symbols

Explains the meaning of various symbols displayed on the product's screen.

Information on the identification plate

Details the information found on the product's identification plate.

Serial number

States where the serial number is located on the product.

CE label

Explains the meaning of the CE label and product compliance.

Energy Saving Trust Endorsed Products

Describes products endorsed by the Energy Saving Trust for energy efficiency.

Operation

Operating concept

Explains the interaction between operator control elements and product functions.

Basic display

Describes the product's current condition as shown on the basic display.

Menu display

Illustrates the structure and components of the menu display.

Operating levels

Details the two available operating levels for users and competent persons.

Cabinet-type casing

Provides guidance on enclosing the product in a cabinet-type casing.

Opening the isolator devices

Instructs on how to open the product's isolator devices for operation.

Starting up the product

Outlines the steps for safely starting up the product after installation.

Switching on the product

Details the procedure for switching the product on using the on/off button.

Setting the language

Guides users through the process of setting the product's display language.

Setting the domestic hot water temperature

Explains how to set the domestic hot water temperature, including safety warnings.

Switching Comfort mode on and off

Describes how to activate and deactivate the Comfort mode for hot water.

Setting the heating flow temperature

Details how to adjust the heating flow temperature and notes on potential limitations.

Switching Green iQ mode on and off

Explains how to activate and deactivate the energy-saving Green iQ mode.

Guaranteeing the correct filling pressure of the heating installation

Guides on checking and ensuring the correct filling pressure for the heating system.

Checking the filling pressure of the heating installation

Details how to check the heating installation's filling pressure using the display.

Filling the heating installation

Provides instructions and cautions for filling the heating installation with water.

Detecting and rectifying faults

Troubleshooting and Fault Rectification

Guides on handling faults, using appendix tables, and contacting a competent person.

Calling up (Live monitor) status codes

Accessing Live Monitor Status Codes

Details the steps to access and view the product's live monitor status codes.

Care and maintenance

Maintenance

Emphasizes the importance of annual inspections by a competent person for product longevity.

Caring for the product

Provides instructions on cleaning the product casing safely and avoiding damage.

Reading maintenance messages

Explains how to interpret maintenance messages displayed by the product.

Checking the condensate drain pipework and tundish

Details the importance of regularly checking the condensate drain for blockages.

Decommissioning

Temporarily decommissioning the product

Outlines the procedure for temporarily shutting down the product, with frost warnings.

Permanently decommissioning the product

Advises users to have a competent person permanently decommission the product.

Recycling and disposal

Guarantee and customer service

Guarantee

Details the two-year guarantee and registration process.

Customer service

Provides contact information for customer service and maintenance agreements.

Troubleshooting

Product does not start up

Lists causes and measures for the product failing to start up.

No hot water

Lists causes and measures for the absence of hot water.

Heating remains cold

Lists causes and measures for the heating system remaining cold.

Hot water generation functioning correctly; heating does not start up

Addresses issues where hot water works but heating does not start.

Status codes - Overview

Displays in heating mode

Lists status codes related to the product's heating operation.

Domestic hot water mode

Lists status codes related to domestic hot water generation.

Comfort mode, warm start or domestic hot water mode with actoSTOR or cylinder charging mode

Lists status codes for comfort, warm start, and cylinder charging modes.

Other displays

Lists status codes for other display functions and modes.