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Last updated: 29th April, 2024


Worcester Bosch Boiler Reset

Worcester Bosch Boiler Reset

Key takeaways

  • Resetting a Worcester boiler can address temporary errors and restore functionality.
  • Regular maintenance ensures longevity and optimal performance of your Worcester boiler.
  • Professional servicing may be required for persistent boiler faults.

In tackling the nuances of Worcester boilers, it is imperative for homeowners to acquaint themselves with their boiler's model specifics, the type they own, and the key components that ensure its efficient operation.

Resetting a Worcester boiler can seem daunting to homeowners, yet with the right guidance, it’s a straightforward procedure. Worcester boilers, a staple in many UK homes, are renowned for their reliability and efficiency. 

Yet, like any complex machinery, they can experience faults—ranging from minor glitches to more persistent errors that require a system reset. Understanding the intricacies of your Worcester boiler is essential for troubleshooting common problems and performing the reset process correctly.

Boilers serve as the heart of home heating systems, but when they malfunction, the comfort of your living space can be compromised. A reset can often restore a Worcester boiler to proper working order, addressing issues such as temporary malfunctions or error codes that halt its operation. 

For more persistent faults, the reset function acts as an initial step in a broader troubleshooting strategy. Regular maintenance and professional servicing are critical to ensure not only the longevity of your Worcester boiler but also its optimal performance throughout its lifecycle.

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Understanding Your Worcester Bosch Boiler

In tackling the nuances of Worcester boilers, it is imperative for homeowners to acquaint themselves with their boiler's model specifics, the type they own, and the key components that ensure its efficient operation.

Best Worcester Boiler Models 2024 Overview

Worcester Bosch boilers remain a popular choice in 2024, with the Greenstar i range leading for efficiency and reliability. Specifically, the Greenstar 8000 Style has set a new benchmark in home heating, with its sleek design and user-friendly interface. Another noteworthy model, the Greenstar 1000, continues to be a standard bearer for cost-effectiveness without compromising performance.

Types of Boilers (combi/Heat-only/system)

Worcester Bosch offers a variety of boilers to suit different household needs:

  • Combi boilers are compact and provide hot water on demand without the need for a tank.

  • Heat-only boilers, also known as regular boilers, require a cold water tank and hot water cylinder.

  • System boilers work with a cylinder for hot water storage but no cold water tank, balancing space saving with efficiency.

Key Components of the System

The heart of a Worcester Bosch boiler is its technological artistry. Common modern boiler components include:

  • A heat exchanger, typically made from cast aluminium or stainless steel, essential for transferring heat to the water.

  • An expansion vessel, which absorbs excess water pressure.

  • The pcb (printed circuit board), serving as the brain that controls and monitors boiler function.

  • Worcester's Greenstar Ri boiler incorporates these components into a compact design ideal for small and medium homes, whereas the Greenstar i Junior offers a simple solution for apartments.

Common Worcester Bosch Boiler Problems and Error Codes

Worcester boilers are robust units, but like any mechanical system, they occasionally experience faults. Error codes displayed on the boiler control panel often indicate the nature of the problem. Understanding what each code signifies can expedite troubleshooting and repairs.

Boiler Lockout and Error Codes

Worcester boilers may enter a lockout state as a protective measure when they detect a fault or abnormal operating conditions. If you notice a blue flashing light, this is a common indicator of lockout. The control panel could display codes such as E9 or D1, alerting to specific issues. In such cases, the boiler ceases operation to prevent damage.

Fault Codes and Their Meanings

Each fault code on a Worcester boiler corresponds to a particular error:

  • A1: Problem with the pump or low water pressure

  • C1: Fan has stopped

  • E9: Overheat lockout

  • D1: Issue with the return sensor

These codes are a starting point for diagnostics and often require a Gas Safe-registered engineer to properly assess and address the underlying fault.

Reset Functionality and Its Use

A key step in troubleshooting Worcester boilers involves the reset function. If a simple fault is detected, such as a temporary fluctuation in gas supply, the reset function can be employed. To reset, find the dedicated reset button and press it for approximately 3-5 seconds. It's imperative to use this function correctly to avoid compounding issues. Note that not all models will be equipped with a reset button, therefore refer to your specific model's guide.

How to Reset a Worcester Bosch Boiler

The ability to reset a Worcester boiler is a critical skill for homeowners to ensure their boilers operate efficiently after minor faults. This process can often rectify common issues without the need for immediate professional intervention.

Locating the Reset Button or Dial

Most Worcester boilers are equipped with a reset button or dial that is strategically placed on the control panel, often labelled for ease of identification. It is crucial to consult the boiler's user manual since the location and appearance of the reset function can vary between models. The reset button may be a prominently marked push-button or a recessed option that requires a pointed object to press. In contrast, a reset dial usually needs to be turned to a specific position to initiate the reset.

Step-by-Step Reset Instructions for Worcester Bosch Boiler Reset

Resetting a Worcester boiler typically involves the following steps:

  1. Identify the Correct Reset Procedure: Firstly, check the user manual for the specific resetting instructions tailored to your boiler model.

  2. Perform the Reset:

    • Push-Button: Press and hold the reset button for 3-5 seconds. Some models might have varying timings, so adherence to the user manual is advised.

    • Thermostat Dial: Rotate the dial to the reset position and then back to the original setting to initiate the resetting process.

  3. Wait for the Boiler to React: After the reset, pause for a few minutes. The boiler should begin its reinitialisation process, reigniting the pilot light and resuming normal operation.

  4. Observe the Boiler's Functioning: Monitor the boiler post-reset. If the boiler does not restart or the fault code reappears, further action might be necessary.

When to Contact a Gas Safe Engineer to Reset Worcester Bosch Boiler

If the reset does not resolve the issue or if fault codes continue to display, it is essential to consult with a Gas Safe registered engineer. In circumstances where there is a smell of gas or the boiler displays signs of a significant malfunction, users should immediately cease their attempts at rectification and consult a professional.

Homeowners should not attempt to repair gas issues themselves as these can be hazardous and potentially lead to gas leaks or explosions. The expertise of a boiler engineer or heating engineer is vital not only for one's safety but also to ensure the boiler operates efficiently and within the terms of any existing warranty.

Worcester Bosch Boiler Reset Troubleshooting Tips

When addressing a malfunctioning Worcester boiler, swift and informed actions are fundamental for a quick restoration of heat and hot water services as well as to maintain optimal efficiency and safety.

Diagnostic Procedures

A rigorously methodical approach is indispensable when troubleshooting a Worcester boiler. Initial steps should include:

  • Visual Inspection: One should carefully scan the boiler's exterior for any signs of damage or leaks. If any physical damage is present, professional assistance is necessary.

  • Error Codes: Worcester boilers typically display error codes that can pinpoint the issue. These codes should be cross-referenced with the boiler's manual for a precise diagnosis.

  • Ignition System: For ignition failure, verify that power supplies to the boiler are uninterrupted. Inspect the ignition leads and electrodes for any indication of wear or damage, and confirm if the pilot light is lit (if applicable).

  • Reset Procedure: If the boiler has a reset function, press and hold the reset button located on the control panel's back for about 3-5 seconds. This action can often clear minor faults.

  • Dangerous Faults: Should you detect a gas odour or suspect a carbon monoxide leak, it's crucial to immediately stop using the boiler, ventilate the area, and contact emergency services at 0800 111 999. Always keep a functional carbon monoxide detector installed in proximity to your boiler.

  • Efficiency Concerns: Periodic boiler servicing ensures optimal functionality and efficiency. An inefficient boiler not only consumes more energy but may also signal underlying issues that need attention.

When embarking on any boiler troubleshooting, always prioritise safety. Should the issue extend beyond these basic checks, enlisting the expertise of a certified engineer is recommended to ensure a safe and accurate resolution.

Worcester Boiler Maintenance and Professional Servicing

Maintaining a Worcester boiler is pivotal for safe operation and longevity. Professional servicing by qualified personnel not only adheres to safety standards but also ensures the appliance runs efficiently.

Regular Maintenance Schedule

Routine upkeep for a Worcester boiler is indispensable. Homeowners should:

An established plan prevents unexpected malfunctions and upholds the manufacturer's guarantee. It's also worth noting that to keep the boiler's warranty valid, the annual service must be carried out by a professional.

Role of a Gas Safe Registered Engineer

A Gas Safe registered engineer is essential for any servicing or repair work on Worcester boilers. They possess:

  • Credentials: Evidence of their competence in handling gas appliances safely.

  • Knowledge: Up-to-date with the latest safety regulations and practices.

When a registered engineer services a boiler, they review all safety features and ensure combustion is occurring correctly, preventing hazardous scenarios. Clients can rest assured that their boiler safety is in capable hands.

Advanced Worcester Features and Settings

Worcester boilers are equipped with sophisticated features to provide precise control and efficient heating management. The digital interface and programmable settings offer a customisable experience for every user.

Digital Display and Control Panel

The control panel serves as the heart of the Worcester boiler’s operation. It boasts a user-friendly digital display that shows real-time information about system pressure, temperature, and fault codes for diagnostics. The intuitive design ensures that adjustments to settings are straightforward, enabling users to maintain their boiler’s performance efficiently.

Thermostat and Room Thermostat Interaction

Modern Worcester boilers integrate seamlessly with both a standard thermostat and sophisticated room thermostats. This combination allows for meticulous temperature regulation within different zones of a household. The room thermostat communicates with the boiler, thereby providing tailored heating levels that respond to individual room requirements, promoting energy efficiency and user comfort.

Advanced Programming Options

For further customisation, Worcester boilers feature advanced programming options through the programmer. Users can set heating patterns that align with daily routines, such as switching the heating on before waking up or turning it off automatically when leaving the house. The flexibility of the programmer underpins the boiler's ability to adapt to diverse lifestyle demands, ensuring a warm environment when needed and energy savings when possible.

Optimising Worcester Boiler Performance

Maintaining optimal performance of a Worcester boiler not only ensures consistent warmth and hot water but also prolongs the system's lifespan. Key performance optimisations involve managing water pressure and maximising efficiency in heating and water usage.

Adjusting Water Pressure

The water pressure within a Worcester boiler is critical for smooth operation; it should typically be between 1 and 2 bars. Homeowners can monitor this via the pressure gauge on the boiler’s control panel. Should the pressure drop below 1 bar, it indicates the need for re-pressurisation. This is achieved by:

  • Locating the filling loop, often beneath the boiler.

  • Opening the valves to allow water into the system.

  • Monitoring the pressure gauge until it reaches the desired level.

  • Closing the valves and ensuring the pressure remains stable.

Heating and Hot Water Efficiency Tips

Efficiently managing the heating and hot water settings can substantially reduce energy consumption. Tips include:

  • Programming your boiler to align with your schedule can prevent unnecessary heating.

  • Reducing hot water temperature slightly, which can save energy without a noticeable difference in comfort.

Insulating pipes and the hot water cylinder keeps heat loss to a minimum. Regular maintenance checks, especially before major seasonal changes, will ensure the heating system operates at peak efficiency.

Of note, should an EA error code appear on the Worcester boiler, this signifies an ignition problem. This is a situation where the homeowner should seek help from a professional. Continually operating a computer-controller boiler at optimum settings will not only enhance efficiency but also contribute to environmental conservation.

Worcester Bosch Greenstar 8000 Lifestyle

The Worcester Bosch Greenstar 8000 Lifestyle range combines cutting-edge technology with sleek design, making it an excellent choice for modern properties. 

This boiler series is available in both combi and system boiler options, providing flexibility based on your heating and hot water needs. 

The Greenstar 8000 Lifestyle range offers high energy efficiency ratings, ensuring reduced energy consumption and lower heating costs. Its advanced features, such as the innovative digital display and compatibility with smart thermostats, allow for easy control and monitoring of your heating system.

Worcester Bosch Greenstar i

The Worcester Bosch Greenstar i series is a popular choice for small to medium-sized properties. With compact dimensions and a range of outputs available, it offers flexibility in installation options. 

The Greenstar i boilers are known for their reliability and high efficiency, helping homeowners save on energy bills. These boilers feature user-friendly controls and compatibility with smart thermostats, allowing you to adjust heating settings effortlessly. 

The Greenstar i series also incorporates advanced technology for improved performance and reduced carbon emissions.

Worcester Bosch Greenstar CDi Classic

If you have a larger property with higher hot water demands, the Worcester Bosch Greenstar CDi Classic range is worth considering. These boilers are available in regular, system, and combi options, catering to different heating system setups. 

The CDi Classic boilers deliver powerful performance, ensuring a constant supply of hot water even in larger households. They boast high energy efficiency ratings, advanced controls, and compatibility with smart technologies, making them an ideal choice for modern, energy-conscious homes.

Worcester Bosch Greenstar Si Compact

For properties with limited space, the Worcester Bosch Greenstar Si Compact range offers a space-saving solution without compromising on performance. These compact boilers are designed to fit snugly into small cupboards or tight spaces. 

The Greenstar Si Compact series delivers excellent energy efficiency and reliable heating, making it suitable for apartments, small houses, or properties with restricted installation areas. Despite their compact size, these boilers incorporate advanced features and intelligent controls for efficient heating management.

New Boiler Costs

Boilers can be a daunting purchase for many people as they’re an appliance with a lot of responsibility, providing heat for you and your family is something you want to get right. Boilers aren’t exactly a quickly disposable item either, potentially lasting you a decade.

Effectively, new boiler cost can be split into two segments: the first is the actual boiler itself (unit price), and the second is the cost of the boiler being installed (set up) in your property by an expert engineer. 

Here at iHeat, we want to remove all of this undue stress and make the decision making process of upgrading to a new central heating system, as easy as possible.

Boiler costs can vary depending on a number of factors including their brand, model, fuel, output, warranty, labour and installation type. Typically a new boiler will cost between £1,845 and £3,500, below is a list of average boiler installations offered by iHeat (guide only).

Installation Type

Price (inc VAT)

Combi to combi swap


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System to combi conversion


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New boiler install


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Back boiler to a combi


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System to system


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Frequently Asked Questions

Why is my Worcester boiler not firing up?

Common culprits for a Worcester boiler not igniting include electrical issues, low pressure, or a fault in the thermostat. It may also stem from a lack of gas flow or a faulty ignition.

Why does my Worcester boiler keep needing to be reset?

A boiler continually needing a reset often indicates underlying issues such as low water pressure, blocked pipes, or radiator airlocks. Frequent resets shouldn't be ignored as they highlight the need for professional inspection.

In what manner do you reset a Worcester Greenstar 30Si boiler?

To reset a Worcester Greenstar 30Si boiler, press the dedicated reset button on the boiler control panel for about three seconds. The system should clear the fault and attempt to restart.

Should I press the reset button on my boiler?

Pressing the reset button on a boiler should only occur if the boiler has locked out or presents a fault. It's a primary response to minor issues; however, if the problem recurs, consultancy with a professional is advised.

How do I get my Worcester boiler out of standby mode?

A Worcester boiler will exit standby mode once it detects a demand for heat, such as turning on a hot water tap or increasing the thermostat temperature to signal heating is required.

How long does a Worcester boiler take to reset?

After pressing the reset button, a Worcester boiler will typically take a few minutes to go through its ignition process. If the boiler doesn't restart, it may require further technical support.

Why is the boiler in standby mode?

Boilers enter standby mode during periods of inactivity as an energy-saving measure. It indicates the boiler is powered but not actively heating, awaiting activation by the thermostat or water flow.

Stephen Day profile photo
Article by
Stephen Day | Co-founder
Gas Safe registered and FGAS certified engineer with over 20 years experience in the heating and cooling industry.