Vaillant ecoTEC pro 28

Other manuals for Vaillant ecoTEC pro 28

Installation And Maintenance Instructions52 pages

Questions and Answers

D
devinmendezSep 3, 2025
What to do if my Vaillant Boiler appliance does not start and ignition fails?
- A
  Ann StantonSep 3, 2025
  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.
B
Brandon FreemanSep 8, 2025
Why is the safety temperature limiter by NTC activated in my Vaillant ecoTEC pro 28 Boiler?
- C
  Cheryl DeanSep 8, 2025
  The safety temperature limiter by NTC might be activated because the Flow-NTC is not correctly thermal-connected or is defective, causing the appliance not to shut down. Check the thermal connection of the Flow-NTC and replace it if defective.
P
Pamela MillerAug 30, 2025
What does it mean if the flow sensor reports a constant value in my Vaillant ecoTEC pro 28 Boiler?
- J
  Jason GreenAug 30, 2025
  If the flow sensor reports a constant value in your Vaillant Boiler, it indicates that the flow sensor is defective. Replace the flow sensor.
D
david51Aug 26, 2025
Why does the flame go off during operation in my Vaillant ecoTEC pro 28?
- C
  Christopher Jimenez MDAug 26, 2025
  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.
C
Crystal DiazAug 27, 2025
What causes rapid temperature rise in my Vaillant ecoTEC pro 28?
- M
  mary88Aug 27, 2025
  A rapid temperature rise in your Vaillant Boiler, indicating a water shortage, can be caused by a blocked pump, insufficient pump output, air in the appliance, low plant pressure, or interchanged flow and return NTCs. Inspect system for air and correct pump issues.
T
tiffanyjacksonSep 18, 2025
What does it mean if my Vaillant Boiler water pressure sensor signal is out of range (too high)?
- L
  lgreerSep 18, 2025
  If the water pressure sensor signal is out of range (too high), the cable to the water pressure sensor has a short-circuit at 5 V / 24 V, or there is an internal fault in the water pressure sensor. Inspect and repair the cable and replace the water pressure sensor.
A
Audrey BarnesSep 23, 2025
What to do if the gas supply to my Vaillant ecoTEC pro 28 Boiler is off?
- C
  Chelsea KellySep 23, 2025
  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.
R
Rachel MitchellSep 12, 2025
What does EEPROM error mean in my Vaillant ecoTEC pro 28?
- J
  James LeeSep 13, 2025
  An EEPROM error indicates that the electronics are defective. Replace the defective electronics.
R
Rebecca SandersSep 4, 2025
What to do if the flame goes off during operation of my Vaillant ecoTEC pro 28 Boiler?
- W
  william86Sep 4, 2025
  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.
S
Scott JensenSep 23, 2025
What to do if the external electricity supply to my Vaillant Boiler is not on?
- T
  Todd JonesSep 23, 2025
  If the external electricity supply to your Vaillant Boiler is off, ensure that the external electricity supply to the boiler is on and that a supply of 230 V~ is present between boiler terminals 'L' and 'N'. Also, ensure that the electrical supply is turned on.

Summary

1 Introduction

1.1 Notes on the documentation

Provides guidance on using the manual and other related documents.

1.2 Introduction

Describes the ecoTEC combination and system boilers and their features.

1.3 General Notes

Details general notes on boiler design and usage.

1.4 CE marking

Explains the CE marking and compliance with relevant directives.

1.5 Gas council numbers

Lists gas council numbers for various ecoTEC appliance models.

2 Boiler specifications

2.1 Technical data

Presents detailed technical specifications for ecoTEC boilers.

2.2 Dimensions

Provides dimensional drawings and measurements for the ecoTEC boiler.

2.4 Installation

Illustrates the functional elements of combination and system boilers.

2.5 Type plate

Locates the type plate information on the Vaillant ecoTEC appliance.

3 General requirements

3.1 Preliminary remarks for room sealed appliances

Discusses preliminary remarks for room sealed appliances.

3.2 Related documents

Lists related documents and standards relevant to boiler installation.

3.3 Contents included with delivery

Details the items included with the Vaillant ecoTEC boiler delivery.

3.4 Installation site

Provides guidelines for selecting an appropriate installation site for the boiler.

3.5 Gas supply

Specifies requirements for the gas supply connection to the boiler.

3.6 Flue pipe

Details requirements and types of flue pipes for Vaillant appliances.

3.7 Flue termination

Provides guidelines for flue termination positions and clearances.

3.8 Air supply

Discusses air supply requirements and ventilation for the boiler.

3.9 Electrical supply

Outlines the requirements for the electrical supply connection.

3.10 Guide to system requirements

Provides guidance on central heating system requirements.

4 Boiler installation sequence

4.1 Transporting the appliance

Provides detailed instructions on safely transporting the boiler.

4.2 Required minimum distances;assembly clearances

Specifies required minimum clearances for boiler installation.

4.3 Flue exit

Instructions for marking and preparing the flue exit hole.

4.4 Fitting the boiler hanging bracket

Details on how to fit the boiler hanging bracket securely.

4.5 Installing the flue system

Guidance on installing the flue system as per separate instructions.

4.6 Fitting the boiler

Steps for lifting and positioning the boiler onto the hanging bracket.

4.7 Removing the front case

Instructions for safely removing the front casing of the boiler.

4.8 General instructions for heating system

General instructions for preparing the heating system before connection.

4.9 Gas connection

Step-by-step guide for making the gas connection to the boiler.

4.10 Cold water mains inlet and hot water outlet

Instructions for connecting cold water inlet and hot water outlet.

4.11 Condensate drain pipe

Details on connecting the condensate drain pipe correctly.

4.12 Heating connection

Guidance on connecting the central heating flow and return pipes.

4.12.1 Heating flow and return connection

Specific instructions for connecting heating flow and return pipes.

4.12.2 Pressure Relief Valve

Instructions for installing the pressure relief valve drain pipe.

4.13 Connecting the flue system to the boiler

Refers to separate instructions for connecting the flue system.

4.14 Electrical connection

General requirements for making the electrical connection.

4.14.1 General requirements

Outlines general safety and compliance requirements for electrical connections.

4.14.2 Connection to the main supply

Step-by-step guide for connecting the boiler to the main electrical supply.

4.14.3 Electric board layout

Diagram showing the electric board layout and connections.

5 Commissioning Part I

5.1 Preliminary electrical checks

Checks to be performed on the electrical installation before commissioning.

5.2 Gas supply

Inspection and purging of the gas installation.

5.3 Cold water supply (ecoTEC combination boilers only)

Checks and purging of the cold water supply for combination boilers.

5.4 Filling and bleeding the heating system

Detailed procedure for filling and bleeding the heating system.

5.4.1 Checking the filling pressure of the heating system

How to check the water pressure in the heating system.

5.4.2 ecoTEC plus combination boiler filling loop

Instructions for using the filling loop on ecoTEC plus combination boilers.

5.4.3 Filling the heating system in ecoTEC pro combination boilers and ecoTEC plus system boilers

Procedure for filling heating systems in pro and system boilers.

5.4.4 Filling the heating system for the first time

Steps for filling the heating system when first installed.

5.5 Initial system flush (“cold”)

Procedure for performing an initial cold flush of the heating system.

5.6 Filling the condensate siphon

Instructions for filling the condensate siphon to prevent fume escape.

5.7 Adjusting the pumping capacity

Guidance on adjusting the pumping capacity for ecoTEC plus boilers.

5.8 Adjusting the by-pass

Instructions for adjusting the boiler's built-in by-pass valve.

5.9 Checking the gas supply

Procedures for checking gas supply pressure and rate.

5.9.1 Factory settings

Information on factory settings for gas supply.

5.9.2 Gas inlet working pressure

How to check the gas inlet working pressure.

5.9.3 Checking the gas rate

Procedure for checking the gas rate against factory settings.

5.10 Refitting the case

Steps for refitting the boiler's front casing after servicing.

6 Functional checks (commissioning part II)

6.1 Functional checks

Procedure for performing functional checks after installation.

6.1.1 Procedure

Step-by-step guide for functional checks and appliance commissioning.

6.1.2 Heating

How to perform a functional check of the heating system.

6.1.3 Water heating (combination boilers only)

How to perform a functional check for domestic hot water heating.

6.1.4 Final flush of the heating system (“hot”)

Procedure for a final hot flush of the heating system.

6.2 Handing over to the user

Instructions for handing over the appliance and explaining its operation.

6.3 Vaillant warranty

Details on Vaillant's warranty terms and conditions.

7 Inspection and maintenance

7.1 Initial inspection

Recommendations for initial inspection and regular servicing intervals.

7.1.1 Safety instructions

Essential safety instructions to follow before starting maintenance work.

7.1.2 Maintenance

General advice and procedures for boiler maintenance.

7.1.3 Overview of the inspection and maintenance tasks

A table summarizing annual inspection and maintenance tasks.

7.1.4 Functional check of boiler operation

Details on performing a functional check of the boiler's operation.

7.2 Servicing the burner module

Procedure for servicing and cleaning the burner module components.

7.2.1 Removing the burner module

Step-by-step guide for removing the burner module.

7.2.2 Cleaning the integral condensation heat exchanger

Instructions for cleaning the condensation heat exchanger.

7.2.3 Checking the burner

Guidance on checking the burner for damage and replacement needs.

7.2.4 Refitting the burner module

Steps for correctly refitting the burner module after servicing.

7.3 Cleaning the condensate siphon

Instructions for cleaning the condensate siphon and refilling it.

7.4 Checking the expansion vessel

Procedure for checking the expansion vessel pressure.

7.5 Recommissioning the boiler

Steps for recommissioning the boiler after maintenance.

7.6 Test operation

Checks to perform after any maintenance task is completed.

8 Troubleshooting

8.1 Logical fault finding procedure

A systematic procedure for diagnosing and finding faults.

8.1.1 Status codes

Explanation of the various status codes displayed by the appliance.

8.1.2 Diagnostic codes

Information on accessing and interpreting diagnostic codes.

8.1.3 Fault codes

Lists fault codes and their potential causes.

8.1.4 Fault memory

How to access and clear the stored fault memory.

8.4 Test programs

Details on triggering and using special test programs.

8.5 Resetting parameter to factory settings

Procedure to reset adjustable parameters to factory default.

9 Parts replacement

9.1 Safety instructions

Crucial safety instructions to follow before replacing any component.

9.2 Replacing burner

Detailed steps for replacing the boiler's burner module.

9.3 Replacing fan or gas valve

Instructions for replacing the fan or gas valve components.

9.4 Replacing expansion vessel

Steps for safely replacing the expansion vessel.

9.5 Replacing primary heat exchanger

Procedure for replacing the primary heat exchanger.

9.6 Replacing electronics and display

Instructions for replacing the electronic components and display.

9.7 Check CO2 content and if necessary set (air-ratio adjustment)

Procedure for checking and adjusting CO2 content for optimal combustion.

10 Recycling and disposal

11 Vaillant service

Appendix

EC declaration of conformity

Official declaration of conformity with EU directives.

Vaillant ecoTEC pro 28 Specifications

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