To Next PageTo Next PageWhat does it mean if my Vaillant ecoTEC pro 28 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 pro 28 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.
Why does the flame go off during operation in my Vaillant ecoTEC pro 28?
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 Boiler 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 pro 28 Boiler?
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 pro 28?
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 ecoTEC pro 28 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 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 pro 28 |
|---|---|
| Category | Boiler |
| Output Rating | 28 kW |
| Efficiency Rating | A |
| Dimensions | 720 x 440 x 338 mm |
| Fuel Type | Natural Gas |
| Boiler Type | Combi |
| Mounting | Wall-mounted |
| Max. Heat Output (DHW) | 28 kW |
| ErP Efficiency | 94% |
| CH ErP Rating | A |
| DHW ErP Rating | A |
| Max. Working Pressure | 3 bar |
| Warranty | 2-5 years |
Provides guidance on using the manual and other related documents.
Describes the ecoTEC combination and system boilers and their features.
Details general notes on boiler design and usage.
Explains the CE marking and compliance with relevant directives.
Lists gas council numbers for various ecoTEC appliance models.
Presents detailed technical specifications for ecoTEC boilers.
Provides dimensional drawings and measurements for the ecoTEC boiler.
Illustrates the functional elements of combination and system boilers.
Locates the type plate information on the Vaillant ecoTEC appliance.
Discusses preliminary remarks for room sealed appliances.
Lists related documents and standards relevant to boiler installation.
Details the items included with the Vaillant ecoTEC boiler delivery.
Provides guidelines for selecting an appropriate installation site for the boiler.
Specifies requirements for the gas supply connection to the boiler.
Details requirements and types of flue pipes for Vaillant appliances.
Provides guidelines for flue termination positions and clearances.
Discusses air supply requirements and ventilation for the boiler.
Outlines the requirements for the electrical supply connection.
Provides guidance on central heating system requirements.
Provides detailed instructions on safely transporting the boiler.
Specifies required minimum clearances for boiler installation.
Instructions for marking and preparing the flue exit hole.
Details on how to fit the boiler hanging bracket securely.
Guidance on installing the flue system as per separate instructions.
Steps for lifting and positioning the boiler onto the hanging bracket.
Instructions for safely removing the front casing of the boiler.
General instructions for preparing the heating system before connection.
Step-by-step guide for making the gas connection to the boiler.
Instructions for connecting cold water inlet and hot water outlet.
Details on connecting the condensate drain pipe correctly.
Guidance on connecting the central heating flow and return pipes.
Specific instructions for connecting heating flow and return pipes.
Instructions for installing the pressure relief valve drain pipe.
Refers to separate instructions for connecting the flue system.
General requirements for making the electrical connection.
Outlines general safety and compliance requirements for electrical connections.
Step-by-step guide for connecting the boiler to the main electrical supply.
Diagram showing the electric board layout and connections.
Checks to be performed on the electrical installation before commissioning.
Inspection and purging of the gas installation.
Checks and purging of the cold water supply for combination boilers.
Detailed procedure for filling and bleeding the heating system.
How to check the water pressure in the heating system.
Instructions for using the filling loop on ecoTEC plus combination boilers.
Procedure for filling heating systems in pro and system boilers.
Steps for filling the heating system when first installed.
Procedure for performing an initial cold flush of the heating system.
Instructions for filling the condensate siphon to prevent fume escape.
Guidance on adjusting the pumping capacity for ecoTEC plus boilers.
Instructions for adjusting the boiler's built-in by-pass valve.
Procedures for checking gas supply pressure and rate.
Information on factory settings for gas supply.
How to check the gas inlet working pressure.
Procedure for checking the gas rate against factory settings.
Steps for refitting the boiler's front casing after servicing.
Procedure for performing functional checks after installation.
Step-by-step guide for functional checks and appliance commissioning.
How to perform a functional check of the heating system.
How to perform a functional check for domestic hot water heating.
Procedure for a final hot flush of the heating system.
Instructions for handing over the appliance and explaining its operation.
Details on Vaillant's warranty terms and conditions.
Recommendations for initial inspection and regular servicing intervals.
Essential safety instructions to follow before starting maintenance work.
General advice and procedures for boiler maintenance.
A table summarizing annual inspection and maintenance tasks.
Details on performing a functional check of the boiler's operation.
Procedure for servicing and cleaning the burner module components.
Step-by-step guide for removing the burner module.
Instructions for cleaning the condensation heat exchanger.
Guidance on checking the burner for damage and replacement needs.
Steps for correctly refitting the burner module after servicing.
Instructions for cleaning the condensate siphon and refilling it.
Procedure for checking the expansion vessel pressure.
Steps for recommissioning the boiler after maintenance.
Checks to perform after any maintenance task is completed.
A systematic procedure for diagnosing and finding faults.
Explanation of the various status codes displayed by the appliance.
Information on accessing and interpreting diagnostic codes.
Lists fault codes and their potential causes.
How to access and clear the stored fault memory.
Details on triggering and using special test programs.
Procedure to reset adjustable parameters to factory default.
Crucial safety instructions to follow before replacing any component.
Detailed steps for replacing the boiler's burner module.
Instructions for replacing the fan or gas valve components.
Steps for safely replacing the expansion vessel.
Procedure for replacing the primary heat exchanger.
Instructions for replacing the electronic components and display.
Procedure for checking and adjusting CO2 content for optimal combustion.
Official declaration of conformity with EU directives.
