Contents

Preface
- Please read these instructions carefully
- Dedicated to heating comfort
Contents
1 Key to symbols and safety instructions
- 1.1 Key to symbols
  - Warnings
  - Important information
  - Additional symbols
- 1.2 Safety precautions
- 2 General information
  - 2.1 Energy efficiency
  - 2.2 Servicing
  - 2.3 Benchmark standard
  - 2.4 User caution
- 3 Controls
  - Display symbols
  - 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 eco and preheat modes
    - 3.1.7 Domestic hot water preheat mode manual activation (Eco mode off)
    - 3.1.8 Domestic hot water preheat mode timed activation, with fascia timer or external timer connected (eco mode off)
    - 3.1.9 Turn off the Operation/fault diagnostic light (blue)
- 4 System Pressure
  - 4.1 Sealed heating systems
  - 4.2 Using the Worcester integral keyed filling link
- 5 Service clearances
- 6 Maintaining your appliance
- 7 Fault finding
  - 7.1 Boiler alert state
  - 7.2 Boiler reset
  - 7.3 Extreme cold weather
- 8 Fault or breakdown
  - Technical support
- 9 Tips on energy saving
  - Heating economically
  - Central heating systems with room thermostat/thermostatic radiator valves
  - Room thermostats
  - New control systems
  - Roof insulation
  - Window frames
  - Radiators
  - Draughts
  - Curtains
- 10 Environment / disposal
  - Packaging
- 11 Your guarantee
  - Guarantee registration
  - For your own record:
- 12 Glossary

Worcester Greenstar 28CDi Compact 2014 User Instructions

Worcester Greenstar 28CDi Compact 2014 Boiler manual cover

Pages 24

Year 2014

Language(s)

of 24

Worcester Greenstar 28CDi Compact 2014 Boiler Specification

The Worcester Greenstar 28CDi Compact, introduced in 2014, is a high-efficiency combination boiler ideal for small to medium-sized homes. It features a compact design, making it suitable for installation in tight spaces, including standard kitchen cupboards. This model boasts a 28 kW output, providing reliable central heating and hot water on demand. The boiler incorporates a user-friendly control panel with intuitive features for easy operation and maintenance. It is equipped with advanced condensing technology, achieving an A-rating for energy efficiency, which helps reduce fuel consumption and lower household energy bills. The Greenstar 28CDi Compact supports a flow rate of up to 10.8 liters per minute, ensuring sufficient water pressure for showers and multiple hot water outlets. It is compatible with a range of smart thermostats and controls, enhancing its flexibility and allowing for optimized heating schedules. The boiler is fitted with frost protection and a robust heat exchanger for increased durability and reliability. Additionally, it is designed with a low NOx burner, contributing to reduced environmental impact by minimizing emissions. The Greenstar 28CDi Compact is also equipped with various safety features, including a pressure relief valve and an automatic air vent. Its compact dimensions, impressive efficiency, and advanced features make it a versatile solution for modern homes seeking both comfort and energy savings.

Worcester Greenstar 28CDi Compact 2014 Boiler F.A.Q.

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

To reset the boiler, press and hold the reset button on the control panel until the reset light stops flashing, which should take about 5 seconds.

What should I do if my boiler is not providing hot water?

First, check the pressure gauge to ensure it is between 1 and 1.5 bar. If it's low, re-pressurize the system. Also, check if the thermostat is set correctly and that there are no error codes displayed.

How do I repressurize the Worcester Greenstar 28CDi Compact boiler?

Locate the filling loop beneath the boiler. Open the two valves to allow water to enter the system until the pressure reaches 1 to 1.5 bar, then close the valves.

What does the error code EA mean on my Worcester Greenstar 28CDi Compact?

Error code EA indicates a flame detection fault. Ensure there is gas supply, the gas valve is open, and reset the boiler. If the problem persists, contact a qualified technician.

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

It is recommended to have your boiler serviced annually by a Gas Safe registered engineer to ensure it is operating safely and efficiently.

Why is my boiler making a loud banging noise?

This could be due to a build-up of limescale or sludge in the heat exchanger, causing kettling. A professional power flush may be required to resolve the issue.

What is the recommended pressure for the Worcester Greenstar 28CDi Compact boiler?

The recommended operating pressure for the boiler is between 1 and 1.5 bar when the system is cold.

How can I bleed the radiators connected to my boiler?

To bleed the radiators, turn off the heating, use a radiator key to open the bleed valve until water starts to come out without air, then close the valve. Check the boiler pressure afterwards.

Why does my boiler keep losing pressure?

Pressure loss can occur due to leaks in the system, faulty pressure relief valve, or air trapped in radiators. Check for visible leaks and bleed radiators to resolve the issue.

Can I install the Worcester Greenstar 28CDi Compact boiler myself?

Installation should only be carried out by a qualified Gas Safe registered engineer to ensure safety and compliance with regulations.