Contents

Contents
1 Safety
- 1.1 General safety instructions
- 1.2 Recommendations
  - 1.2.1 The Benchmark Scheme
  - 1.2.2 Benchmark Commissioning Checklist
- 1.3 Liabilities
  - 1.3.1 User's liability
  - 1.3.2 Installer's liability
  - 1.3.3 Manufacturer's liability
2 About this manual
- 2.1 General
- 2.2 Additional documentation
- 2.3 Symbols used
  - 2.3.1 Symbols used in the manual
- 2.4 Abbreviations/glossary
3 Technical specifications
- 3.1 Homologations
  - 3.1.1 Certification
- 3.2 Technical data
  - 3.2.1 Technical information
4 Description of the product
- 4.1 General description
- 4.2 Operating principle
  - 4.2.1 Air-gas adjustment
  - 4.2.2 Combustion
  - 4.2.3 Heating and domestic hot water production
- 4.3 Control panel description
  - 4.3.1 Description of the control panel
- 4.4 Accessories and options
5 Operation
- 5.1 Start-up
  - 5.1.1 Procedure for first start-up
  - 5.1.2 Changing the heating flow temperature
  - 5.1.3 Changing the domestic hot water (DHW) temperature
- 5.2 Shutdown
  - 5.2.1 Switching off of the heating and domestic water (DHW)
- 5.3 Frost protection
6 Settings
- 6.1 Access to USER parameters
- 6.2 List of USER parameters
7 Maintenance
- 7.1 General
- 7.2 Maintenance instructions
  - 7.2.1 Filling the installation
  - 7.2.2 Venting the installation
- 7.3 Maintenance message
  - 7.3.1 Caricamento impianto
  - 7.3.2 Deareazione impianto
8 Troubleshooting
- 8.1 Temporary and permanent faults
- 8.2 Error codes
- 8.3 Fault finding
9 Decommissioning
- 9.1 Decommissioning procedure
10 Disposal
- 10.1 Disposal and recycling
11 Environmental
- 11.1 Energy saving
- 11.2 Room thermostats and settings
12 Warranty
- 12.1 General
- 12.2 Standard warranty terms and conditions
13 Appendix
- 13.1 Product fiche - Combination boilers
- 13.2 Package fiche - boilers
- 13.3 Package fiche - Combination heaters (boilers or heat pumps

Baxi 400 Combi 2 User Guide

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Baxi 400 Combi 2 Specification

The Baxi 400 Combi 2 is a high-efficiency, compact, and user-friendly combination boiler designed for residential heating and hot water needs. With its compact dimensions and lightweight design, the Baxi 400 Combi 2 is easy to install and ideal for homes where space is limited. This boiler delivers reliable performance with an energy efficiency of up to 93%, making it compliant with modern efficiency standards and helping reduce household energy bills.

The Baxi 400 Combi 2 is available in two power outputs, 24kW and 30kW, allowing homeowners to choose the unit that best suits their heating and hot water demands. It features an impressive flow rate of up to 12.1 liters per minute, ensuring a consistent supply of hot water even in busy households. The boiler incorporates an advanced heat exchanger technology that enhances its durability and efficiency, providing long-lasting and trouble-free operation.

A key feature of the Baxi 400 Combi 2 is its compatibility with smart home technology, allowing users to control their heating remotely via smartphone apps. This feature not only adds convenience but also aids in optimizing energy use. The intuitive control panel is user-friendly, with clear instructions and easy-to-read displays for straightforward operation.

Safety is a priority with the Baxi 400 Combi 2, which includes multiple in-built safety mechanisms such as frost protection and automatic shut-off in case of system irregularities. It also operates with low noise levels, ensuring minimal disruption in the home environment. Overall, the Baxi 400 Combi 2 is a reliable, efficient, and technologically advanced solution for modern residential heating and hot water requirements.

Baxi 400 Combi 2 F.A.Q.

How do I reset the Baxi 400 Combi 2 boiler?

To reset the Baxi 400 Combi 2 boiler, locate the reset button on the control panel. Press and hold the button for 5 seconds until the boiler restarts.

What should I do if my Baxi 400 Combi 2 is not heating water?

Check the thermostat settings and ensure the boiler is set to heat water. Also, verify that there is power to the unit and the gas supply is on. If the problem persists, consider contacting a professional technician.

How often should I service my Baxi 400 Combi 2 boiler?

It is recommended to service your Baxi 400 Combi 2 boiler annually to ensure optimal performance and safety.

What does the error code E133 mean on a Baxi 400 Combi 2?

Error code E133 indicates a failure to ignite, often due to a gas supply issue. Check that the gas supply is active and reset the boiler. If the issue persists, contact a qualified engineer.

How do I increase the pressure in my Baxi 400 Combi 2?

To increase the pressure, locate the filling loop beneath the boiler. Open the valves until the pressure gauge reads between 1 and 1.5 bar, then close the valves.

What causes the Baxi 400 Combi 2 boiler to lose pressure?

Common causes for pressure loss include leaks in the system, radiator bleed, or a faulty pressure relief valve. Inspect the system for visible leaks and consider consulting a professional if the issue continues.

Can I install the Baxi 400 Combi 2 boiler myself?

No, the installation of a Baxi 400 Combi 2 boiler must be performed by a certified Gas Safe registered engineer to ensure safety and compliance with local regulations.

How do I bleed a radiator connected to a Baxi 400 Combi 2 system?

Turn off your heating system and allow the radiators to cool. Use a radiator key to slowly open the bleed valve, releasing air until water starts to escape, then close the valve.

What is the normal operating pressure for the Baxi 400 Combi 2?

The normal operating pressure for the Baxi 400 Combi 2 is typically between 1 and 1.5 bar.

Why does my Baxi 400 Combi 2 keep cycling on and off?

Frequent cycling can be caused by incorrect thermostat settings, a faulty thermostat, or an issue with the boiler's pressure or flow. Checking these factors or consulting a professional may resolve the issue.