To Next PageTo Next PageWhat does it mean if my Vaillant Boiler shows eBUS undervoltage?
An eBUS undervoltage indication means there could be a short circuit on the eBUS, an overload on the eBUS, or two power sources on the eBUS with different polarity. Check the eBUS connections and power sources.
What to do if the heating system of my Vaillant ecoTEC plus 824 is not full of water?
If your Vaillant Boiler's heating system isn't full of water or charged correctly, make sure the heating system is full of water and charged to between 1 and 1.5 bar. If it's not, refill and vent the system.
What to do if my Vaillant ecoTEC plus 824 is dry firing?
If your Vaillant Boiler is dry firing, it indicates there may be too little water in the appliance, a defective water shortage switch, a defective cable to the pump or water shortage switch, a blocked or defective pump, or the pump output is too low. Ensure adequate water supply and check the water shortage switch and pump.
Why does the flame go off during operation in my Vaillant ecoTEC plus 824 Boiler?
If the flame goes off during operation and subsequent ignition attempts fail in your Vaillant Boiler, it could be due to a temporarily stopped gas supply, spark failure in the ignition transformer, or faulty earthing of the appliance. Check gas supply and ignition system for faults.
What to do if my Vaillant ecoTEC plus 824 shows a gas valve shutoff delay?
If your Vaillant Boiler shows a gas valve shutoff delay, the gas valve may be leaking, or the electronics may be defective. Inspect the gas valve for leaks and test the electronics.
How to fix Flow NTC open circuit in Vaillant Boiler?
A Flow–NTC open circuit can be caused by a broken NTC, a broken NTC cable, a defective connection at the NTC, or a defective connection at the electronics. Check and repair the NTC and connections.
What causes a short circuit in the tank sensor of my Vaillant ecoTEC plus 824?
A short circuit in the tank sensor of your Vaillant Boiler can be caused by a defective NTC, an earth leak/short circuit in the cable loom, or a damp plug connection. Inspect and replace the NTC or repair damp connections.
What does it mean 'No valid DSN in AI and/or BMU' in Vaillant ecoTEC plus 824?
If your Vaillant Boiler displays 'No valid DSN in AI and/or BMU', it indicates a spare part failure where the AI and motherboard were interchanged at the same time. Replace faulty components to resolve DSN issue.
What to do if the water pressure sensor or cable harness hydraulics are defective in my Vaillant Boiler?
If the water pressure sensor or cable harness hydraulics are defective in your Vaillant Boiler, it could be due to a broken line to the water pressure sensor, a short-circuit at 0 V, or a defective water pressure sensor. Inspect and replace the water pressure sensor or repair the line.
What to do if there is a short circuit in the flow-NTC of my Vaillant ecoTEC plus 824 Boiler?
If there is a short circuit in the flow-NTC of your Vaillant Boiler, it could be due to the NTC plug shorted to the casing or a defective NTC. Inspect and replace the NTC if defective.
General| Model | ecoTEC plus 824 |
|---|---|
| Category | Boiler |
| Type | Combination Boiler |
| Output | 24 kW |
| Dimensions (H x W x D) | 720 x 440 x 338 mm |
| Efficiency | 89.3% |
| Energy Efficiency Class | A |
| Mounting | Wall-mounted |
| ERP Rating | A |
| DHW Output (kW) | 24 kW |
| Maximum Working Pressure | 3 bar |
| Weight | 34 kg |
| Fuel | Natural Gas |
| Warranty | 5 years |
Information to help users throughout the documentation. Covers applicable documents and retention.
Details on boiler installation and servicing by competent persons, and CORGI registration.
Describes boiler design for sealed central heating systems, mounting, and flue options.
Explains the CE marking compliance with EU directives for gas appliances and EMC.
Lists gas council numbers for various Vaillant ecoTEC appliance models.
Provides detailed technical specifications for ecoTEC boilers including outputs, dimensions, and electrical data.
Illustrates the physical dimensions of the boilers with a legend for connections and components.
Diagrams showing function elements of combination and system boilers for installation.
Information on the location of the Vaillant ecoTEC type plate attached at the factory.
Guidance on installing Vaillant boilers with approved flue systems and installation instructions.
Lists relevant regulations, British Standards, and publications for boiler installation.
Details the components included in the Vaillant ecoTEC package unit for system and combination boilers.
Specifies requirements for the installation location, including space for servicing and air circulation.
Details requirements for gas supply, meter connection, pipework, and leak testing.
Emphasizes the use of genuine Vaillant flue pipes and describes standard and optional flue systems.
Provides details on flue termination positions and clearances according to BS 5440.
Discusses air supply requirements and ventilation for cupboard or compartment installations.
Outlines requirements for the 230V electricity supply, connection methods, and earthing.
Covers water circulation systems, filling, pressure relief, and expansion vessels.
Details the circulating pump specifications and by-pass valve adjustments.
Describes the siphonic condensate trap or normal condensing water trap.
Provides detailed manual handling recommendations for lifting and moving the boiler.
Specifies minimum clearances around the boiler for installation and servicing.
Instructions for marking and preparing the flue exit hole based on flue system type.
Details on fixing the hanging bracket securely to the wall for boiler mounting.
Guidance to install the flue system referring to separate air/flue duct installation instructions.
Instructions for lifting and engaging the boiler onto the hanging bracket.
Step-by-step guide on how to remove the front casing of the boiler.
Cautionary advice on cleansing the heating system before connecting the appliance.
Details on making the gas connection, including safety, pipework, and leak checks.
Instructions for connecting cold water and hot water pipes for combination boilers.
Describes the condensate trap and connection to the discharge pipework.
Instructions for connecting heating flow and return pipes and pressure relief valve.
Reference to separate air/flue duct installation instructions for connecting the flue system.
Covers general electrical requirements, main supply connection, and wiring diagrams.
Details Vaillant controls, accessories, and connection details for external electrical controls.
Discusses the use of thermostatic radiator valves with the boiler's automatic by-pass.
Explains the integral frost thermostat and the need for additional protection measures.
Information on the built-in circulating pump and its automatic overrun period.
Describes the anticycling control to prevent energy-wasteful short cycling of the boiler.
Explains the APS feature that spins the pump to prevent seizure during periods of non-operation.
Checks for short circuit, earth continuity, resistance to earth, and correct polarity.
Inspection, leak check, and purging of the gas installation according to regulations.
Procedure for filling and purging the hot water circuit for combination boilers.
Detailed steps for filling and bleeding the heating system, including using test programs.
Instructions for flushing the heating system to remove installation residues.
Guidance on filling the condensate siphon with water to prevent fume escape.
Information on adjusting the two-stage pump capacity for ecoTEC plus boilers.
Details on adjusting the appliance's by-pass valve for pressure control.
Procedure for checking gas inlet working pressure and gas rate.
Instructions for refitting the front casing and securing clips after commissioning.
How to adjust the boiler's central heating output range rating.
Information on converting the appliance between natural gas and LPG modes.
Procedure for performing functional checks on the appliance after installation.
Guidance on instructing the user about boiler operation, controls, and maintenance.
Recommendations for regular inspection and servicing of the boiler for safe operation.
Detailed steps for removing, cleaning, and refitting the burner module and its components.
Instructions for cleaning the condensate siphon to prevent fume escape.
Procedure for checking the expansion vessel charge pressure every three years.
Steps for recommissioning the boiler after maintenance tasks are completed.
Checks to perform after any maintenance task, including gas/water leaks and burner operation.
A systematic approach to diagnosing and resolving boiler faults before using fault codes.
Details on triggering special functions and test programs via the appliance controls.
Instructions on how to reset individual or all parameters to factory default settings.
Crucial safety instructions to follow before and during component replacement.
Step-by-step guide for replacing the burner module, including safety precautions.
Procedure for replacing the fan or gas valve, ensuring correct component positioning.
Instructions for replacing the expansion vessel, including pressure checks.
Guidance on replacing the primary heat exchanger, including safety and disconnection steps.
Steps for replacing electronic components and setting the appliance variant number.
Procedure for checking and adjusting CO2 content for optimal combustion.
Document confirming the appliance's compliance with relevant EU directives.
Regulations and standards to be observed for flue installation.
Details on alternative termination accessories and planning flue duct layout.
Instructions for installing the sliding sleeve to allow flue fitting flexibility.
Steps for installing horizontal air/flue duct systems, including top and side outlets.
Guidance on assembling and installing the black terminal kit for horizontal air/flue ducts.
Instructions for installing the variable termination kit, including flue terminal clearances.
Procedure for installing vertical air/flue duct systems, including pitched and flat roof installations.
Instructions on how to add extensions and install elbows for air/flue ducts.
Regulations and standards to be observed for flue installation.
Details on alternative termination accessories and planning flue duct layout for 80/125 systems.
Instructions for changing the appliance connection piece for different air/flue duct systems.
Guidance for installing the sliding sleeve for 80/125 air/flue duct systems.
Steps for installing horizontal air/flue duct systems with extensions for 80/125 diameter.
Procedure for installing vertical air/flue duct systems for 80/125 diameter.
Instructions on adding extensions and installing elbows for 80/125 air/flue ducts.
