Vaillant EcoTEC Plus 624 User Guide: An Overview
This guide details the Vaillant EcoTEC plus 624 boiler, a domestic heating and hot water solution. It covers operation, maintenance, and troubleshooting, ensuring efficient performance.
Explore available PDF manuals for installation, servicing, and user instructions, supporting optimal system functionality and longevity.
The Vaillant EcoTEC plus 624 is a highly efficient, domestic central heating and hot water boiler, specifically engineered for UK homes. This combi boiler offers reliable performance and compact dimensions, making it suitable for a variety of properties.
Designed for ease of use and installation, the EcoTEC plus 624 boasts advanced technology for optimal energy efficiency. Understanding its features and operation is key to maximizing its benefits. This user guide provides comprehensive information, covering everything from initial setup to routine maintenance and troubleshooting common issues.
Access to detailed manuals, including installation and servicing guides, ensures long-term, reliable operation.
Key Features and Benefits
The Vaillant EcoTEC plus 624 delivers numerous advantages, starting with its high efficiency, reducing energy consumption and lowering bills. Its compact design allows for flexible installation options, even in smaller homes. The boiler’s reliable performance ensures consistent heating and hot water supply.
Furthermore, the EcoTEC plus 624 is compatible with the Benchmark scheme, promoting quality installation and regular servicing. A two-year guarantee provides peace of mind, covering parts and labor against defects; Access to comprehensive user manuals and readily available support further enhance the ownership experience.

Understanding Your Boiler
Familiarize yourself with the EcoTEC plus 624’s components and specifications (VU 246/5-5). Knowing its heat output range and parts is crucial for operation.
Boiler Specifications (VU 246/5-5)
The Vaillant EcoTEC plus 624, model VU 246/5-5 (H-GB), is designed for domestic central heating and hot water systems. It boasts a nominal heat output range of 3.3 to 13.2 kW at 50/30°C. This compact boiler delivers efficient performance, making it suitable for various home sizes.
Key specifications include its water heater functionality and durable construction. It’s engineered for reliability and ease of use. Understanding these specifications is vital for proper installation, maintenance, and troubleshooting, ensuring optimal operation and longevity of your heating system.
Nominal Heat Output Range
The Vaillant EcoTEC plus 624 exhibits a versatile nominal heat output range, crucial for adapting to varying heating demands. Specifically, it operates between 3.3 kW and 13.2 kW when measured at a 50/30°C flow and return temperature. This modulation capability ensures efficient energy usage, providing optimal warmth without excessive fuel consumption.
This range allows the boiler to effectively heat homes of different sizes and insulation levels. Understanding this output range is key to maximizing efficiency and comfort, tailoring the boiler’s performance to your specific needs and environmental conditions.
Component Identification
Familiarizing yourself with the EcoTEC plus 624’s components is vital for understanding its operation and maintenance. Key elements include the heat exchanger, fan, gas valve, pump, and control unit. The digital display panel provides crucial system information and error messages.
External components like the flue and condensate pipe are also important. Knowing the location and function of each part aids in troubleshooting and allows for informed communication with service engineers during maintenance or repairs, ensuring optimal boiler performance and longevity.

Operating Instructions
The EcoTEC plus 624 is designed for simple operation. This section details procedures for switching the boiler on/off, setting desired temperatures, and controlling hot water supply.
Switching On and Off
To switch on the Vaillant EcoTEC plus 624, ensure the main gas supply is active. The boiler will typically initiate automatically when heating is demanded, signaled by the illuminated display panel. If a manual reset is needed, locate the power switch – often near the bottom front panel – and toggle it to the ‘on’ position.
For shutdown, either reduce the thermostat setting to its lowest point, effectively halting demand, or use the same power switch to turn the boiler off. Always allow a brief cooling period before repeated cycling. Remember to consult the full user manual for specific details related to your installation.
Setting the Temperature
Adjusting the temperature on your Vaillant EcoTEC plus 624 is primarily done through the room thermostat, controlling the heating demand. The boiler responds to this signal, modulating its output to maintain the set temperature. Some models feature a control panel allowing direct temperature adjustments, typically displayed in Celsius.
For precise control, consider a smart thermostat integration. Ensure the desired temperature aligns with comfort levels and energy efficiency. Avoid excessively high settings. Refer to the comprehensive user manual for detailed instructions specific to your boiler’s control interface.
Hot Water Control
The Vaillant EcoTEC plus 624 provides on-demand hot water, activated when a hot tap is opened. The boiler modulates its output to deliver water at the set temperature. Some models offer adjustable hot water temperature settings via the control panel, typically ranging from 40°C to 60°C.
For safety and efficiency, avoid setting excessively high temperatures. Consider the needs of your household when adjusting the hot water temperature. Refer to the user manual for specific instructions on accessing and modifying these settings on your particular EcoTEC plus 624 model.

Display Panel and Error Codes
The EcoTEC plus 624’s display panel shows system status using icons. Error codes indicate faults, requiring troubleshooting. Consult the manual for code definitions and solutions.
Understanding the Display Icons
The Vaillant EcoTEC plus 624 boiler utilizes a clear display panel featuring various icons to communicate system status at a glance. A flame icon indicates the boiler is actively heating, while a water tap symbol signifies hot water production is in progress.
A snowflake icon denotes the heating system is operating in cold protection mode, preventing freezing. Other icons may represent specific error conditions or system demands. Familiarizing yourself with these icons, as detailed in the user manual, is crucial for understanding your boiler’s operation and quickly identifying potential issues.
The display also shows temperature settings and operational modes, providing comprehensive control and monitoring capabilities.
Common Error Codes and Troubleshooting
The Vaillant EcoTEC plus 624 displays error codes to indicate system faults, aiding in troubleshooting. A common code, F1, often signals low water pressure – check the system pressure and repressurize if needed. Error code F2 may indicate a flame detection issue, potentially requiring a reset or professional attention.
Other codes relate to gas supply, fan operation, or temperature sensor failures. The user manual provides a comprehensive list of error codes and suggested solutions. For persistent errors or those requiring specialized knowledge, always consult a qualified heating engineer. Attempting complex repairs without proper training can be dangerous.

Maintenance and Servicing
Regular maintenance ensures optimal performance and longevity. Annual servicing by a qualified engineer, adhering to the Benchmark Scheme, is crucial for safety and efficiency.
Regular Maintenance Tasks
To maintain your Vaillant EcoTEC plus 624 boiler’s efficiency, perform simple checks regularly. Visually inspect the boiler for any leaks or corrosion, ensuring all connections remain secure. Keep the boiler casing clean and free from obstructions to allow for proper ventilation.
Check the system pressure monthly, maintaining it within the manufacturer’s recommended range – typically between 1 and 1.5 bar. If pressure is low, consult the ‘Low Pressure Issues’ section. Do not attempt complex repairs yourself; these tasks are best left to qualified service engineers.
Consistent monitoring and these basic checks contribute to a longer lifespan and reliable operation of your heating system.
Annual Servicing Requirements
Vaillant strongly recommends annual servicing by a Gas Safe registered engineer for your EcoTEC plus 624 boiler. This comprehensive service ensures optimal performance, safety, and efficiency. The engineer will inspect key components, including the heat exchanger, burner, and flue, for any signs of wear or damage.
Servicing also verifies correct gas pressure and combustion, minimizing the risk of carbon monoxide. Vaillant is a Benchmark Scheme member, promoting high installation and servicing standards. Regular servicing maintains your boiler’s guarantee and provides peace of mind.
Don’t delay – schedule your annual service today!
Benchmark Scheme & Servicing
Vaillant actively participates in the Benchmark Scheme, a quality standard for heating system installations and commissioning within the UK. This commitment ensures your EcoTEC plus 624 is installed to a high standard, maximizing safety and efficiency. Benchmark promotes regular servicing to maintain optimal performance and longevity.
A fully completed Benchmark checklist is essential proof of correct installation and commissioning. Annual servicing by a Gas Safe registered engineer is crucial, verifying the boiler operates safely and efficiently. This also protects your warranty and provides peace of mind.
Look for the Benchmark logo for assured quality!

Safety Information
Carbon monoxide is a deadly, odorless gas. Ensure proper ventilation and install a carbon monoxide detector for your safety. The boiler has a 2-year guarantee.
Carbon Monoxide Warning
It is crucial to understand the dangers of carbon monoxide (CO), a colorless, odorless, and highly toxic gas produced by incomplete combustion. Your Vaillant EcoTEC plus 624 boiler, while designed with safety in mind, requires proper installation and maintenance to prevent CO buildup. Regular servicing by a qualified engineer is essential.
Install a CO detector that meets BS EN 50292 standards in a room containing or adjacent to the boiler. Ensure it’s tested regularly. Symptoms of CO poisoning include headache, dizziness, nausea, and confusion. If you suspect CO poisoning, immediately ventilate the area and seek medical attention. Never ignore potential warning signs, as CO can be fatal.
Do not block ventilation points and ensure flues are clear.
Boiler Guarantee (2-Year)
Vaillant provides a comprehensive two-year guarantee on the EcoTEC plus 624 appliance, covering both parts and labor against manufacturing defects. This guarantee begins from the date of installation, offering peace of mind to homeowners. To validate the guarantee, the boiler must be installed by a Gas Safe registered engineer and commissioned correctly.
The guarantee covers faults arising from normal use, but excludes issues caused by incorrect installation, scale buildup, or lack of regular servicing. Maintaining service records is vital for any claim. For full terms and conditions, refer to the guarantee document provided with your boiler or visit the Vaillant website.

Installation and Commissioning
Professional installation by a Gas Safe engineer is essential for the EcoTEC plus 624. Proper commissioning ensures safe and efficient operation, adhering to Benchmark Scheme standards.
Professional Installation Required
The Vaillant EcoTEC plus 624 boiler must be installed by a qualified and Gas Safe registered engineer. Attempting self-installation is dangerous and voids the warranty. A professional will ensure correct gas and water connections, proper ventilation, and adherence to all relevant building regulations.
Correct installation is crucial for safe and efficient operation. The engineer will also commission the boiler, setting it up for optimal performance and verifying all safety features are functioning correctly. This includes testing the flue, checking gas pressure, and ensuring the system is properly sealed.
Always verify the engineer’s credentials before allowing them to work on your boiler.
Initial Commissioning Steps
Following professional installation, the engineer will perform initial commissioning. This vital process ensures the EcoTEC plus 624 operates safely and efficiently. Steps include filling and pressurizing the central heating system, purging air from the radiators, and verifying correct gas supply pressure.
The engineer will then set the boiler’s parameters, including heating and hot water temperatures, based on your specific system requirements. They’ll test all functions, checking for leaks and ensuring the flue operates correctly.
Finally, they’ll explain the boiler’s operation and controls to you.

User Manuals and Documentation
Comprehensive manuals are available in PDF format, covering installation, servicing, and user operation for the Vaillant EcoTEC plus 624 boiler.
Access these resources online for detailed guidance and troubleshooting assistance.
Available PDF Manuals
A range of PDF manuals are readily accessible for the Vaillant EcoTEC plus 624, catering to different user needs. These include the detailed Installation and Servicing Manual, essential for qualified professionals undertaking setup and maintenance.
The Operating Instructions Manual provides clear guidance for everyday use, covering controls, display functions, and basic troubleshooting. Installation and Maintenance Instructions Manual offers a comprehensive overview of the system.
Downloading these manuals ensures you have the latest information at your fingertips, supporting efficient operation and long-term reliability of your boiler.
Installation and Servicing Manual
The Vaillant EcoTEC plus 624 Installation and Servicing Manual is a crucial document intended for qualified heating engineers. It details the correct procedures for safely installing, commissioning, and maintaining the boiler, adhering to industry standards.
This manual covers essential aspects like gas connection requirements, flue installation guidelines, and electrical wiring diagrams. Servicing information includes detailed instructions for routine maintenance tasks, component checks, and fault diagnosis.
Proper adherence to this manual ensures optimal performance, safety, and compliance with warranty conditions.

Troubleshooting Common Issues
This section addresses typical problems like no heating/hot water or low pressure. Refer to error codes and follow the guide for potential solutions and safe operation.
No Heating or Hot Water
If your Vaillant EcoTEC plus 624 isn’t providing heating or hot water, several factors could be at play. First, check the boiler’s display panel for any error codes; these provide crucial diagnostic information. Ensure the boiler has sufficient gas supply and that all valves are open.
Verify the system pressure is within the recommended range (typically between 1 and 1.5 bar). Low pressure can prevent operation. If the issue persists, try resetting the boiler by switching it off and on again. If these steps don’t resolve the problem, consult a qualified heating engineer for further assistance, as it may indicate a more complex fault requiring professional attention.
Low Pressure Issues
Low pressure on your Vaillant EcoTEC plus 624 boiler often triggers error codes and prevents operation. Locate the pressure gauge on the boiler’s front panel; it should ideally read between 1 and 1.5 bar. If the pressure is too low, you may need to repressurise the system. This typically involves using the filling loop to add water until the correct pressure is reached.
Be cautious not to overpressurise. Repeatedly low pressure could indicate a leak somewhere in the system, requiring a qualified engineer to identify and repair it. Ignoring this issue can lead to further damage and inefficiency.

Decommissioning the Boiler
Safe decommissioning requires a qualified engineer to isolate gas, electricity, and water. Proper procedures ensure environmental responsibility and future re-installation readiness.
Safe Decommissioning Procedures
Decommissioning the Vaillant EcoTEC plus 624 must be performed by a qualified and certified heating engineer. This ensures adherence to safety regulations and proper system isolation. The engineer will first isolate the gas supply, verifying it’s completely shut off.
Next, electrical power to the boiler needs disconnection, followed by draining the water from the system. Careful consideration must be given to the disposal of any harmful substances. Properly documenting the process is crucial, including dates and engineer details. This protects both the property and the environment, preventing future issues.
