Updated: 12th July, 2024
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In this guide, we are going to highlight the most common Worcester BOSCH errors that can show up on your boiler and explain what they mean so you can solve any issues yourself at home.
Watch our YouTube video which covers some of this blog article.
A boiler error code is an alphanumeric indication displayed on your boiler's control panel. These codes are used by manufacturers to help identify specific issues or faults within the boiler system.
Each code corresponds to a particular problem, such as pressure loss, ignition failure, or overheating. By understanding these codes, homeowners can diagnose issues more efficiently and determine whether they can be resolved through simple troubleshooting or require professional attention.
Before you begin to stress and worry about being out of pocket when a code appears on your Worcester Bosch Greenstar boiler, there are two things you should consider first:
Worcester is renowned for having long warranties on their boilers, so the first thing to do whenever an issue arises is to check whether you are still covered.
In some cases, your boiler might be backed by a ten-year warranty which can make it cheaper to have any issues resolved by a professional.
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It is crucial to call a Gas Safe registered engineer if you encounter persistent or serious boiler issues indicated by error codes, such as frequent ignition failures, repeated pressure drops, or overheating.
Additionally, if you smell gas, see signs of carbon monoxide leaks, or if the boiler displays unfamiliar or complex error codes, professional intervention is necessary. Gas Safe engineers are certified to handle gas appliances safely and can ensure that your boiler is repaired correctly and efficiently, maintaining both your safety and the boiler's performance.
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We have all heard the classic 'turn it off and on again' as a solution for when things go wrong, but there is some truth behind the cliché.
In some cases, an error code might show even if there is not a mechanical problem so to save yourself time and effort try turning the device off to see whether it goes away.
If the error code appears once the boiler has rebooted, it is time to look further into it.
Welcome to iHeat’s ultimate guide to understanding and troubleshooting Worcester Bosch boiler error codes. This user-friendly and SEO-optimised content will help you quickly diagnose and resolve boiler issues to keep your home warm and safe.
Meaning: Low water pressure.
Causes: Leak in the system, pressure relief valve issue, or recent bleeding of radiators.
Solutions: Repressurize the system to 1-1.5 bar. Inspect for visible leaks and repair them. Check the pressure relief valve for proper functioning.
Meaning: Fan speed too low.
Causes: Blocked flue, fan motor issue, or control board problem.
Solutions: Ensure the flue is clear of blockages. Check and replace the fan motor if necessary. Test the control board and replace it if needed.
Meaning: Overheat lockout.
Causes: Faulty pump, airlock in the system, or thermostat failure.
Solutions: Verify the pump operation and replace it if faulty. Bleed the system to remove any airlocks. Check the thermostat and replace it if necessary.
Meaning: Ignition failed.
Causes: Gas supply issue, ignition electrode fault, or flue gas sensor issue.
Solutions: Ensure the gas supply is turned on and the meter is functioning. Inspect and clean the ignition electrode. Verify the flue is not blocked.
Meaning: Sensor fault.
Causes: Faulty NTC thermistor, wiring issue, or control board fault.
Solutions: Check and replace the NTC thermistor. Inspect the wiring for any issues. Test and replace the control board if necessary.
Meaning: Hot water NTC sensor fault.
Causes: Faulty sensor, wiring issue, or connection problem.
Solutions: Replace the hot water NTC sensor. Inspect wiring and secure connections.
Meaning: Hot water outlet sensor short circuit.
Causes: Faulty sensor, wiring issue, or connection problem.
Solutions: Replace the hot water outlet sensor. Inspect wiring and secure connections.
Meaning: Coding card not recognised.
Causes: Incorrect coding card, card not inserted correctly, or faulty control board.
Solutions: Verify and replace the coding card if necessary. Ensure proper insertion. Test and replace the control board if needed.
Meaning: Burner control fault.
Causes: Burner issue, gas valve fault, or control board problem.
Solutions: Inspect the burner and clean or repair it. Check and replace the gas valve. Test and replace the control board if necessary.
Meaning: Safety temperature limiter.
Causes: Overheating, faulty safety temperature limiter, or circulation issue.
Solutions: Allow the boiler to cool down. Replace the safety temperature limiter. Ensure proper circulation by checking the pump and system pressure.
Meaning: No heating demand from external controls.
Causes: Faulty external controls or wiring issue.
Solutions: Inspect and repair external controls. Check wiring connections.
Meaning: Return sensor fault.
Causes: Faulty sensor or wiring issue.
Solutions: Replace the return sensor. Inspect wiring and secure connections.
Meaning: Flow sensor fault.
Causes: Faulty sensor or wiring issue.
Solutions: Replace the flow sensor. Inspect wiring and secure connections.
Meaning: Flow temperature sensor fault.
Causes: Faulty sensor or wiring issue.
Solutions: Replace the flow temperature sensor. Inspect wiring and secure connections.
Meaning: Water pressure sensor fault.
Causes: Faulty sensor or wiring issue.
Solutions: Replace the water pressure sensor. Inspect wiring and secure connections.
Meaning: Condensate pump fault.
Causes: Faulty condensate pump or blocked pipe.
Solutions: Check and replace the condensate pump if necessary. Clear any blockages in the pipe.
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 | £1,845 | |
System to combi conversion | £2,499 | |
New boiler install | £2,899 | |
Back boiler to a combi | £3,299 | |
System to system | £1,945 |
Locating the error code on your Worcester boiler is straightforward. When an error occurs, the boiler's control panel displays a specific code. This code is your key to understanding the issue at hand. If it's a blocking error, no data will be shown, and your boiler will cease operation. You can find the cause code by pressing the spanner or return button. This will display a three-digit number, which is the specific error code.
Fault codes on a Worcester boiler are specific sets of characters that appear on the boiler's control panel when something is amiss. Each code corresponds to a particular issue. For example, 'C6 215' indicates a fan speed error, '9A 362' suggests Heat Control Module (HCM) issues, and 'EA 227' signals no flame due to blockage or internal leak. These codes are designed to help you diagnose and rectify issues with your boiler.
A flashing signal symbol on your Worcester boiler is a visual indicator of a potential issue. The nature of the problem is usually determined by the pattern and speed of the flashing. For instance, a slow flash could indicate that the service mode switch is in the minimum position, while a fast flash could mean that the code plug is blocked. It's essential to refer to your boiler's manual or seek professional advice when these symbols appear.
Clearing an error code on your Worcester boiler can often be achieved by resetting the boiler. This involves turning the boiler off and then on again. If the error code persists after a reset, it's advisable to call a professional boiler engineer to diagnose and rectify the problem. Remember, safety should always be your primary concern when dealing with boiler issues.
Boiler fault codes are unique sets of characters that are displayed on the boiler's control panel when an issue arises. These codes are designed to help you identify the nature of the problem. Some issues might be simple fixes, like topping up the boiler pressure, while others might require a visit from a certified Gas Engineer. Always refer to your boiler's manual or seek professional advice when fault codes appear.
The lights on your Worcester boiler serve as visual indicators of the boiler's status or any potential issues. For example, if you have a Worcester Bosch Ri boiler, a flashing blue light indicates that no gas is being supplied to your unit. If you need to determine if there's a fault with your gas supply or boiler, you should check any other gas appliances in your home, such as the hob, oven, or fire.
The 'C6 215' fault code on your Worcester boiler indicates a fan speed error. This means the fan speed in your boiler is too high. While the fan speed might return to normal after restarting the boiler, if it doesn't, you'll need to have it checked by a boiler engineer.
The 'EA 227' fault code on your Worcester boiler indicates that there's no flame signal due to a blockage or internal leak. This could mean several things. It could be an issue with the gas valve, a sign that the gas ratio control valve needs adjusting, or an indication that the condensate discharge pipe is blocked or frozen. These issues should be handled by a professional boiler engineer.
Resetting your Worcester boiler is a simple process. You need to locate the reset button on your boiler's control panel. Hold this button down for about 3 to 5 seconds. After releasing the button, your boiler should reset and start functioning normally. If the boiler doesn't reset or if it still shows error codes, it's time to call a professional.
Maintaining your Worcester boiler involves regular servicing and checks. Ensure the boiler is serviced annually by a Gas Safe registered engineer. Regularly check the boiler's pressure and top it up if necessary. Keep the boiler and its surrounding area clean and free from obstructions. In winter, protect your condensate pipe from freezing. And finally, if you notice any unusual noises, smells, or error codes, call a professional immediately.
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