Contents

preface
Contents
1 Symbols and safety precautions
- 1.1 Explanation of symbols
- 1.2 safety precautions
- 2 General Information
- 3 Controls
  - 3.1 Operating the boiler
    - 3.1.1 Boiler display
    - 3.1.2 Setting the boiler flow temperature for the central heating system
    - 3.1.3 Boiler frost protection
    - 3.1.4 Turning the central heating off during the summer
    - 3.1.5 Setting the flow temperature for domestic hot water system
    - 3.1.6 Domestic hot water preheat (without fascia timer fitted)
    - 3.1.7 Domestic hot water preheat (with fascia timer fitted)
    - 3.1.8 Domestic hot water eco mode
    - 3.1.9 Boiler alert state
    - 3.1.10 Boiler reset
    - 3.1.11 Turn off the Operation/fault diagnostic light (blue)
- 4 System Pressure
  - 4.1 Sealed heating systems
  - 4.2 Using the Worcester integral filling link
- 5 Service Clearances
- 6 Maintaining your Boiler
- 7 Fault Finding
  - 7.1 Extreme cold weather
- 8 Fault or Breakdown
- 9 Tips on energy saving
- 10 Environment / disposal
- 11 Your guarantee
- 12 Glossary

Worcester Greenstar 28CDi Compact 2012 User Instructions

Worcester Greenstar 28CDi Compact 2012 Boiler manual cover

Pages 20

Year 2012

Language(s)

of 20

Worcester Greenstar 28CDi Compact 2012 Boiler Specification

The Worcester Greenstar 28CDi Compact, introduced in 2012, is a high-efficiency condensing combi boiler designed for small to medium-sized homes. It offers a compact form factor, making it suitable for installation in tight spaces, such as kitchen cupboards. The boiler delivers a central heating output of 24 kW and a domestic hot water output of 28 kW, providing a reliable supply of heat and hot water on demand. It features a modulating pump and an advanced heat exchanger, contributing to its impressive energy efficiency ratings, with an ErP rating of A for heating and hot water.

The Greenstar 28CDi Compact incorporates Worcester's innovative technology to ensure optimal performance and user convenience. It includes a user-friendly interface with clear digital controls, allowing for simple operation and precise temperature adjustments. The boiler is compatible with a range of optional controls, including smart thermostats and weather compensation sensors, enabling enhanced energy management and comfort.

Safety and reliability are paramount, with the boiler equipped with frost protection and a comprehensive range of diagnostic and safety features to ensure long-term operation without interruption. The compact design does not compromise on performance, as it is capable of delivering a flow rate of up to 11.4 liters per minute, ensuring a steady supply of hot water even in households with moderate demands.

The Worcester Greenstar 28CDi Compact is engineered to meet modern efficiency standards while providing ease of installation and maintenance. Its compatibility with solar thermal systems further enhances its eco-friendly credentials, making it an excellent choice for environmentally conscious homeowners seeking a dependable, efficient heating solution.

Worcester Greenstar 28CDi Compact 2012 Boiler F.A.Q.

How do I reset my Worcester Greenstar 28CDi Compact boiler?

To reset your Worcester Greenstar 28CDi Compact boiler, press the reset button located on the front panel and hold it for a few seconds until the reset light goes out.

What should I do if my boiler is leaking water?

If your boiler is leaking water, turn off the boiler and water supply, and contact a professional engineer to inspect and repair the issue.

Why is my Worcester Greenstar 28CDi Compact boiler not heating water?

Check if the thermostat is set correctly and ensure there is no issue with the gas supply. If the problem persists, contact a qualified technician for further diagnosis.

How often should I service my Worcester Greenstar 28CDi Compact boiler?

It is recommended to have your Worcester Greenstar 28CDi Compact boiler serviced annually by a qualified engineer to ensure it operates efficiently and safely.

What does the flashing blue light indicate on my boiler?

A flashing blue light typically indicates an error or fault with the boiler. Refer to the user manual for specific fault codes or contact a professional for assistance.

How can I increase the water pressure in my Worcester boiler?

To increase the water pressure, locate the filling loop below the boiler, open the valves, and allow water to enter the system until the pressure reaches the desired level (usually between 1 and 1.5 bar).

What should I do if my boiler makes unusual noises?

Unusual noises may indicate air in the system, low pressure, or a mechanical issue. Bleed the radiators and check the pressure. If noises continue, contact a heating engineer.

Can I use my Worcester boiler during a power outage?

No, the Worcester Greenstar 28CDi Compact boiler requires electricity to operate. It will not function during a power outage.

How do I bleed a radiator connected to my boiler?

To bleed a radiator, turn off the heating system, use a radiator key to open the bleed valve, and release trapped air until water begins to flow. Close the valve and check the boiler pressure.

What maintenance tasks can I perform on my boiler?

Regularly check the pressure gauge, keep the area around the boiler clean, and ensure that vents and flues are unobstructed. Annual professional servicing is also recommended.