To Next PageTo Next PageWhy is there a dry fire in my Vaillant ecoTEC plus 831?
A dry fire in your Vaillant Boiler can occur due to too little water in the appliance, a defective water pressure sensor, a defective cable to the pump or water sensor, a blocked or defective pump, or a pump output that is too low. Ensure sufficient water supply and check the pump and sensors for faults.
What to do if the flame goes off during operation of my Vaillant ecoTEC plus 831 Boiler?
If the flame goes off during operation and subsequent ignition attempts fail, it could be due to a temporarily stopped gas supply or faulty earthing of the appliance. Check the gas supply and earthing connections.
What to do if my Vaillant ecoTEC plus 831 appliance does not start and ignition fails?
If your Vaillant Boiler fails to start and ignition attempts fail, there may be faults in the gas supply, such as a defective gas meter or gas pressure detector, air in the gas, gas flow pressure too low, or a disengaged fire protection tap. There may be faults in the gas valve, wrong gas setting, defective igniter (ignition transformer, ignition cable, ignition plug), stopped ionization current (cable, electrode), faulty earthing in the appliance or defective electronics. Inspect the gas supply and ignition components for faults.
What does it mean 'No valid DSN in AI and/or BMU' in Vaillant ecoTEC plus 831?
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 causes a short circuit in the tank sensor of my Vaillant ecoTEC plus 831?
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.
Why does my Vaillant Boiler show a flame when the gas valve is off?
If your Vaillant Boiler shows a secondary light, where the ionization signal reports a flame even when the gas valve is turned off, it could be due to defective gas solenoid valves or a defective flame detector. Inspect and replace the gas valves or flame detector.
Why won't my Vaillant Boiler start?
If your Vaillant Boiler fails to ignite, it could be due to faults in the gas supply, such as a defective gas meter, air in the gas line, low gas flow pressure, or a tripped fire protection tap. It can also be caused by issues with the gas fitting, incorrect gas setting, a defective igniter, interrupted ionization current, faulty earthing, or defective electronics. Diagnose and rectify issues in the gas supply and fittings.
Why is there no pressure change when the pump turns on in my Vaillant ecoTEC plus 831 Boiler?
If no sudden change in pressure is detected when turning on the pump in your Vaillant Boiler, it could be due to a defective water pressure sensor or pump, or too little water in the appliance. Ensure sufficient water supply and inspect the pump.
What causes a flow and/or return sensor fault in my Vaillant Boiler?
A fault in the flow and/or return sensor of your Vaillant Boiler is caused by defective flow and/or return sensors. Replace the defective sensors.
What does it mean if the flow sensor reports a constant value in my Vaillant ecoTEC plus 831?
If the flow sensor reports a constant value in your Vaillant Boiler, it indicates that the flow sensor is defective. Replace the flow sensor.
General| Model | ecoTEC plus 831 |
|---|---|
| Category | Boiler |
| Output | 31 kW |
| ERP Rating | A |
| Mounting | Wall-mounted |
| Boiler Type | Combi |
| Type | Condensing |
| Fuel | Natural Gas |
| Warranty | 5 years |
| Efficiency | 89.3% |
| Dimensions | 720mm x 440mm x 338mm |
Information on the documentation provided for the appliance and general notes for clarity.
General information about the boiler's design for sealed central heating systems and mounting.
Detailed technical specifications including output, dimensions, electrical data, and performance figures.
Diagram showing the overall dimensions of the boiler and key connection points in millimeters.
Diagrams illustrating the function elements of combination and system boilers for installation.
Lists relevant standards, regulations, and documents for boiler installation.
Guidance on selecting a suitable location for the boiler, considering clearances and environmental factors.
Requirements for the gas supply, including connection, pipework size, and leak checks.
Details on the required electrical supply, connection methods, and safety precautions.
Specifies the necessary clearances around the boiler for installation and servicing.
Instructions for safely connecting the gas supply to the boiler, including required tools and checks.
Guidelines for connecting the heating flow and return pipes to the boiler, including pressure relief valve.
Detailed instructions for making the electrical connection to the boiler, including wiring diagrams.
List of Vaillant compatible controls and accessories with their connection details.
Information on connecting external electrical controls like time switches and thermostats.
Schematic showing connections for time switches and room thermostats to the boiler terminals.
Checks to be performed on the electrical installation before commissioning the boiler.
Inspection, leak checks, and purging of the gas installation according to regulations.
Procedures for filling the heating system, including checks and bleeding air from radiators.
Instructions for flushing the heating system to remove installation debris before boiler commissioning.
Procedures for performing functional checks on the appliance after installation.
Steps for checking the heating operation, including status indicators and display readings.
Guidance on instructing the user on safe operation, controls, and the importance of regular servicing.
Recommendations for regular inspection and servicing of the boiler for safe and efficient operation.
Overview of inspection and maintenance tasks to be performed annually and as part of regular servicing.
Detailed steps for removing, cleaning, and refitting the burner module components.
Step-by-step procedure for diagnosing and resolving potential issues with the boiler.
Explanation of status codes displayed by the appliance to indicate operating conditions.
Information on accessing and interpreting diagnostic codes for fault analysis and parameter adjustment.
Crucial safety instructions to be followed before replacing any component to prevent damage or injury.
Procedure for safely removing and refitting the burner module, including necessary checks.
Steps for replacing the fan or gas valve, emphasizing safety and correct reassembly.
Document confirming the appliance's compliance with relevant European directives.
