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Worcester boilers repair guide 

Is your Worcester boiler not working? Don’t worry, we’re here to help!

In this guide, we’ll explain the common Worcester boiler errors, reasons why they’re not working and what you can do to either fix the issues yourself or get in touch with an engineer who can help.

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Common Worcester boiler problems

Below is a list of common Worcester boiler problems that could be affecting your system:

Lockout due to low boiler pressure 

A Worcester Bosch boiler will slowly lose pressure during its lifetime. When you have low water pressure, your system will go into lockout mode, which prevents it from working to stop any future damage.

No hot water

There are numerous reasons why your system won’t provide hot water on demand. Possible causes could be broken diaphragms and airlocks, issues with the thermostat, low water levels or failure of motorised valves.

Boiler is leaking (A281 or EA338)

This issue needs to be fixed immediately, as the longer you leave it the more damage will be done to your boiler and potentially the rest of the central heating system.

Boiler keeps making banging noises (A41)

A banging noise coming from your boiler is often called “kettling” and is usually caused by a build-up of sludge & limescale within the boiler. This will cause serious issues if not repaired as soon as physically possible.

Condensate pipe blocked (EA225 or D5)

A condensate pipe gets rid of harmful gases by dumping out excess water that was produced during heating. If you have an external condensate pipe when the weather takes a turn for the worse your boiler could lockout due to excess freezing of the wastewater within the pipe.

This is an easy issue to fix as you just need to thaw the pipe slowly, read our full guide here.

Worcester boiler error codes

Worcester Bosch boilers can give us with a lot of information through their fault codes, helping professional engineers get a head start when undertaking a repair.

  • Blocked condensate pipe – this is a common problem, usually occurring in cold weather, resulting in a lockout. A simple thaw and reset will clear the E229 fault.
  • Leaking – this is usually caused by a blown pump seal, which degrades over time or may have come under too much stress with the flow rate. An A281 or EA338 error code will appear
  • Repeated lockout – these can be caused by overheating or abnormally high/low pressure. These are characterised by an EA 227 fault code.
  • Overheating – this may be caused by a faulty fan or pump, blocked PRV, or condensate blockage. Look for D1 286, E5 218, E5 332, E9 219 or E9 224 error codes.

Codes vary between models, so check out our full guide on the entire list of Worcester Bosch Boiler Error Codes.

Worcester Boiler playing up?

Let our experts take care of it with an emergency repair

If your Worcester boiler isn’t heating up, you may need to seek help from an engineer.

Our Boiler Plan Gas Safe experts will point out any work that needs to be carried out, they'll also provide a fixed price repair quote.

With our 24 hour emergency repair and 95% first time fix rate, we’ll have your heating up and running again in no time.

Book a Boiler Repair

Do I need an engineer to fix my Worcester boiler?

There are always going to be issues you can fix quickly without having to be qualified. Check out our list below that will let you know if there’s a problem you can tackle yourself, or if you need to get an engineer in to help.


Possible Cause

Do you need an engineer?

No heat or hot water

Issues with the airlocks, failure of motorised valves, thermostat or low water levels


Leaking and dripping

Most commonly there will be a broken internal component inside your boiler. 


Banging, whistling or gurgling noises

Air trapped in the system, or water pressure is too low (kettling).


Losing pressure

Leak in your central heating system, pressure relief valve will need to be replaced - or your radiators have been bled recently and will need a top up.

No, unless there’s a leak

Frozen condensate pipe

A fault code will be displayed on your boiler - usually with a warning notification


Thermostat issues

Thermostat may not be connected properly, or it’s turned off or not set to the correct time or settings.

Consider replacing


Your heat exchanger has a build-up of lLimescale or sludge.


Radiators not getting hot

A build-up of sludge or air with in the system or wrong distribution of heat.

Just bleed your radiators. You can do this by yourself or get an engineer. 

Boiler keeps switching itself off

Lack of water pressure or water flow - could also be air trapped in the system or the circulating pump isn’t working correctly. 


Do I need to replace my Worcester Boiler?

If your Worcester boiler is over 10 years old and needs a new expensive part, such as a heat exchanger, then it may be more cost-effective to replace your boiler with an A-rated energy efficient boiler instead of repairing it.

Boiler Plan offers a variety of finance options, including a 24-month interest-free plan, so we try to make a new boiler as affordable as possible. You can get a free personalised quote for your home and heating system by clicking the button below.

Get a fixed price quote today

How much does a Worcester boiler cost?

Whether you’re looking for the cheapest boiler replacement available or to invest in a high-quality brand that will give you peace of mind and longevity; we have broken down the costs for you. 

A new Worcester Bosch boiler can indeed be expensive but should be seen as an investment in making your home a more comfortable and indeed safer space to live in - with the price ranging from £1800 - £3000 depending on the chosen model.

The cost can also be made less overwhelming with our payment plans, which offer customers flexible ways to pay for top-rated boiler brands. From interest free to Buy Now Pay Later - allowing you to spread the cost over a more manageable period.

Do I need Worcester boiler cover?

Protect your Worcester Bosch Boiler with a Care Plan.

There are a whole host of possible faults to be mindful of when it comes to your Worcester Boiler. Which is why it’s best to be protected should anything unforeseen happen to your own heating system.

With our range of affordable care plans, there’ll be no need to fluster should you see a fault code.

Cover your Worcester Boiler Now