vaillant ecotec pro manual 28
Vaillant ecoTEC Pro 28 Manual: A Comprehensive Guide
This manual details the installation, operation, and maintenance of the Vaillant ecoTEC Pro 28 condensing gas boiler,
covering procedures from initial setup to troubleshooting common error codes like F.28.
The Vaillant ecoTEC Pro 28 is a highly efficient condensing gas boiler designed for both central heating and domestic hot water (DHW) production. This model, specifically the VUW 286/5-3, boasts a power output of 25.5kW, making it suitable for heating spaces up to 255 square meters.
This comprehensive guide provides detailed instructions for installers, service engineers, and end-users. It covers everything from unpacking and initial inspection, through to gas and water connections, operational procedures, and essential maintenance tasks. Understanding this manual is crucial for ensuring the safe, efficient, and long-lasting performance of your ecoTEC Pro 28 boiler. Refer to document 0020245008_01 for installation and servicing details.
Key Features and Specifications
The Vaillant ecoTEC Pro 28 excels with its condensing technology, maximizing efficiency and reducing fuel consumption. Key features include a compact design for flexible installation, a user-friendly control panel, and compatibility with a range of flue systems.
Specifications include: a heating power output of 25.5kW, DHW output of 30kW, and modulation range of 1:4. The boiler operates on natural gas or LPG. It features electronic ignition and flame safeguard with modulation. Dimensions are compact, aiding installation in various spaces. The ecoTEC Pro 28 is known for its reliability and quiet operation, offering a comfortable heating experience. Refer to the technical data sheet for a complete breakdown of components and performance metrics.

Installation and Setup
Proper installation of the Vaillant ecoTEC Pro 28 requires qualified personnel, following the provided installation and maintenance guide (0020245008_01) carefully.
Unpacking and Initial Inspection
Upon receiving your Vaillant ecoTEC Pro 28, carefully inspect the packaging for any signs of damage during transit. The unit typically arrives fully assembled as a single package. Once unpacked, thoroughly examine the boiler itself for any visible defects, such as dents, scratches, or loose components.
Verify that all included accessories, as listed in the accompanying documentation, are present. This includes any mounting brackets, connection hoses, and relevant manuals. Confirm the boiler’s model number matches your order to ensure you have the correct unit.
Do not proceed with installation if any damage or missing parts are discovered. Contact your supplier immediately to report the issue and arrange for a replacement or repair. Retain all packaging materials until the inspection is complete.
Mounting and Connection Procedures
Securely mount the Vaillant ecoTEC Pro 28 to a suitable wall, ensuring it’s level and can support its weight. Utilize appropriate mounting brackets and fixings, adhering to the manufacturer’s specifications. Maintain adequate clearance around the boiler for servicing and ventilation, as outlined in the installation guide.
Before making any connections, ensure the gas and electricity supplies are isolated. Carefully connect the flue system, verifying a proper seal to prevent carbon monoxide leakage. Connect the condensate drain to a suitable waste outlet, ensuring it has a continuous fall.
All connections must be performed by a qualified and certified technician, complying with local regulations and safety standards. Double-check all connections for tightness and integrity before proceeding.
Gas and Water Connections
Gas connection requires a qualified Gas Safe registered engineer. Ensure the gas supply pressure matches the boiler’s requirements, typically specified on the data plate. Use appropriate gas pipework and fittings, adhering to relevant safety regulations. Perform a gas tightness test after connection, utilizing a suitable leak detection fluid.
Water connections involve linking the boiler to the cold water supply and the central heating system. Install a suitable filter to prevent debris from entering the boiler. Ensure proper pipe sizing and insulation to minimize heat loss.
Always check for water leaks after making connections. Proper grounding is crucial for safety; ensure the boiler is correctly earthed according to local electrical codes.

Operating Instructions
The ecoTEC Pro 28 operates via a user-friendly control panel. Adjust temperature settings for both heating and hot water, and familiarize yourself with the boiler’s functions.
Powering On and Initial Startup
Before the initial startup of your Vaillant ecoTEC Pro 28, ensure the gas and water supplies are connected and the boiler is correctly installed by a qualified engineer. Once confirmed, locate the power switch – typically found on the boiler’s control panel. Turn the switch to the ‘ON’ position;
The boiler will initiate a self-diagnostic check, which may take a few moments. Observe the control panel for any error messages. A successful startup is indicated by a stable display showing the current temperature settings. If an error code appears, consult the ‘Troubleshooting and Error Codes’ section of this manual for guidance.
Allow the system to prime, and verify hot water and heating functions are operational. Initial operation may involve purging air from the system, which a qualified technician should oversee.
Setting the Temperature and Hot Water

Adjusting the room temperature on your Vaillant ecoTEC Pro 28 is done via the control panel. Use the ‘+’ and ‘-’ buttons to increase or decrease the desired temperature. The current setpoint is displayed prominently. For hot water, access the hot water temperature setting through the menu – typically indicated by a tap icon.
Similarly, use the ‘+’ and ‘-’ buttons to set your preferred hot water temperature. Be mindful of Legionella prevention; maintaining a minimum hot water temperature is crucial. Some models offer pre-set comfort profiles for convenience.
Explore the advanced settings for features like time-controlled temperature adjustments and holiday mode for energy efficiency.
Understanding the Control Panel
The Vaillant ecoTEC Pro 28’s control panel is your central interface for boiler operation. It features a digital display showing current temperature settings, error codes, and operational status. Navigation is typically achieved using a combination of buttons – often including ‘+’, ‘-’, ‘Menu’, and ‘Enter’ or a central dial.
The display indicates both room temperature and hot water temperature setpoints; Icons represent various functions like heating mode, hot water availability, and any active error conditions.
Familiarize yourself with the menu structure to access advanced settings, including time schedules, temperature limits, and diagnostic information. Refer to the manual for specific icon meanings and button functions.

Troubleshooting and Error Codes
This section details common Vaillant ecoTEC Pro 28 error codes, such as F.28 (ignition failure), and provides solutions for resetting the boiler and addressing operational issues.
Common Error Codes (e.g., F.28) and Solutions
The Vaillant ecoTEC Pro 28 displays error codes to indicate specific faults. A frequently encountered code is F.28, signifying a failure during ignition – often due to insufficient gas supply, a faulty ignition transformer, or issues with the flame sensor.
To resolve F.28: First, verify the gas supply is open and adequate. Then, attempt a boiler reset. If the error persists, inspect the flame sensor for cleanliness and proper function. A qualified technician should check the ignition transformer and gas valve.
Other potential codes include those related to water pressure, over heating, or sensor malfunctions. Consulting the full technical documentation is crucial for accurate diagnosis and repair. Always prioritize safety and seek professional assistance when dealing with gas appliances.
Resetting the Boiler
Resetting your Vaillant ecoTEC Pro 28 can often resolve minor operational issues or clear error codes. The process typically involves locating the reset button, usually found on the control panel. Press and hold this button for approximately 3-5 seconds until the boiler attempts to restart its ignition sequence.
Before resetting, ensure any identified faults are addressed, such as checking the gas supply. Repeated resets without resolving the underlying problem indicate a more serious issue requiring professional attention.
If the boiler fails to restart after a reset, consult the error code displayed and refer to the troubleshooting section of this manual. Always prioritize safety and avoid repeated attempts if the boiler consistently fails to ignite.
Identifying and Addressing Operational Issues
Recognizing operational issues with your Vaillant ecoTEC Pro 28 is crucial for maintaining efficient heating and hot water. Common problems include low pressure, error codes like F.28 (ignition failure), and inconsistent heating. Low pressure requires repressurizing the system, following the instructions in the installation guide.
Error codes signal specific faults; consult the troubleshooting section for detailed solutions. Inconsistent heating may indicate air in the system, requiring bleeding of radiators. If issues persist, check the gas supply and flue for obstructions.
For complex problems, always consult a qualified heating engineer to avoid damaging the boiler or compromising safety. Regular servicing helps prevent many operational issues.

Maintenance and Servicing
Regular maintenance, including descaling and annual servicing by a qualified engineer, ensures optimal performance and longevity of your Vaillant ecoTEC Pro 28 boiler.
Regular Maintenance Tasks
To maintain your Vaillant ecoTEC Pro 28 boiler’s efficiency and reliability, several routine checks are recommended. Visually inspect the unit regularly for any signs of leaks or corrosion, paying close attention to pipework and connections. Ensure the flue is unobstructed and free from debris, as this is crucial for safe operation.
Periodically check the system pressure and top up if necessary, following the instructions in the operating manual. Clean the boiler casing with a damp cloth to remove dust and dirt. It’s also advisable to check the condensate pipe for blockages, especially during colder months when freezing can occur. Remember, these tasks are supplementary to the annual service performed by a qualified technician.
Descaling Procedures
Over time, limescale can build up within the Vaillant ecoTEC Pro 28 boiler, reducing its efficiency and potentially causing damage. Descaling removes these deposits, restoring optimal performance. This process typically involves using a proprietary descaling solution, carefully following the manufacturer’s instructions and safety guidelines.
It is strongly recommended that descaling is carried out by a qualified heating engineer, as incorrect procedures can void the warranty or damage the boiler. The engineer will circulate the descaling solution through the primary circuit, ensuring all components are thoroughly cleaned. After descaling, the system must be flushed with clean water to remove any remaining solution and debris. Regular descaling intervals depend on water hardness levels.
Annual Servicing Requirements
To maintain the Vaillant ecoTEC Pro 28’s efficiency and ensure safe operation, an annual service by a Gas Safe registered engineer is crucial. This service includes a comprehensive inspection of all components, including the burner, flue, and heat exchanger, checking for any signs of wear or corrosion.
The engineer will also assess gas pressure, combustion efficiency, and safety devices, ensuring they are functioning correctly. A flue gas analysis is performed to verify optimal combustion. Regular servicing helps identify potential issues before they escalate, preventing costly repairs and extending the boiler’s lifespan. Record keeping of all servicing is recommended for warranty purposes and maintaining a safe heating system.

Technical Specifications
The Vaillant ecoTEC Pro 28 boasts a 25.5kW output, capable of heating up to 255 sq.m, and features detailed component breakdowns for servicing and repair.
Detailed Technical Data Sheet
The ecoTEC Pro 28 (VUW 286/5-3) operates as a condensing gas boiler, designed for both central heating and domestic hot water (DHW) production. Its nominal heat output ranges up to 25.5 kW. The boiler utilizes a modulating output, adapting to heating demands for efficiency. Gas consumption varies depending on output level, with specific values detailed in the full documentation.
Key parameters include the gas type (natural gas or LPG), gas connection size, water pressure requirements (typically 1.5-5 bar), and electrical supply specifications (230V). Dimensions are crucial for installation planning, and the unit’s weight is also specified. The flue gas temperature and emissions data are provided for compliance and safety assessments. Further details regarding efficiency ratings and sound power levels are available within the comprehensive technical documentation.
Component Breakdown
The Vaillant ecoTEC Pro 28 comprises several key components. These include the primary heat exchanger, constructed from stainless steel for durability and efficient heat transfer. A modulating burner adjusts gas supply based on demand, optimizing combustion. The fan ensures proper airflow for efficient operation and flue gas extraction.
Essential control elements are the PCB (Printed Circuit Board), managing boiler functions, and the gas valve regulating gas flow. A pump circulates heating water throughout the system. Safety features include a pressure relief valve and air pressure switch. The unit also incorporates sensors for temperature monitoring and fault detection. Access to these components is detailed in the installation and servicing manual for maintenance purposes.

Safety Precautions
Prior to any installation or servicing, disconnect the boiler from the gas and electricity supply. Ensure adequate ventilation during operation to prevent carbon monoxide buildup. Only qualified and certified engineers should perform installation, maintenance, and repairs.
Regularly check flue integrity for blockages or damage, as this poses a significant safety risk. Never attempt to modify the boiler’s safety components. Adhere strictly to local gas and electrical regulations. Be aware of potential hot surfaces during and after operation to avoid burns. Always follow the manufacturer’s instructions detailed in the manual for safe operation and maintenance procedures.