What 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 Boiler 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 Boiler 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.
What to do if my Vaillant Boiler shows flow and/or return NTC fault?
If there is a flow and/or return NTC fault, the flow and/or return NTC is defective (tolerances too big). Replace the flow and/or return NTC.
What to do if the gas supply to my Vaillant ecoTEC plus 831 is off?
If the gas supply to your Vaillant Boiler is off or not correctly purged, check that the gas supply to the boiler is on, that it has been correctly purged, and that an inlet pressure of 20 mbar is available at the gas valve.
How to fix Return NTC short circuit in Vaillant Boiler?
A Return NTC short circuit can be caused by a defective NTC, a short circuit in the cable harness, or a cable/casing shortcut. Replace the NTC and inspect the cable harness.
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.
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 to do if my Vaillant ecoTEC plus 831 Boiler has no communication to mainboard?
If there is no communication to the mainboard, there might be a connection error between the display and the mainboard. Check the connections to the mainboard.
What to do if there is a short circuit in the flow-NTC of my Vaillant ecoTEC plus 831 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.
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.
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 |
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