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Worcester Bosch Boiler Fault Codes
If you encounter a fault code problem with your Worcester Bosch boiler, your focus is getting this problem resolved as quick as possible to avoid the situation continuing.
Some Worcester Bosch boilers will ‘lockout,’ and this happens to prevent any additional possible harm and keep you and your house safe.
However, a boiler error code, sometimes known as a fault code, will often be presented on the dashboard at this instance. The code that is displayed on the dashboard aims to keep things simple for you or the engineer to determine the issue and fix it as quickly as possible.
A little understanding on the specific fault code, can help you understand the problem, so that this can be communicated to your local Gas Safe engineer. If you are interested to learn more, then in this blog we have compiled common Worcester Bosch boiler fault codes and what they stand for. It will help give a better idea of what is wrong with your boiler. Read on.

Need help with your Worchester Bosch Boiler?

MK City Plumbing & Heating is here to assist. We are the number one choice for all your plumbing and heating requirements. Give us a call on 01908 464 075, we are here to help!
MK City Plumbing & Heating are your local Worcester Bosch accredited installers who have a wealth of expertise in installers, servicing and repairing Worcester Bosch boilers. In Milton Keynes and surrounding areas, we are known to be your go-to company for fault finding on Worcester Bosch boilers.

The most frequent issues with your Worcester Bosch boiler

A problem with your Worcester Bosch boiler is unlikely due to the high quality of its components, but like with everything, the older the boiler, the more problems you will likely have to deal with. In general, your boiler internal components will be subject to wear and tear and these can fail over time. Below are a few Worcester Bosch boiler problems that may occur over time.

The Boiler is Leaking

The longer a Worcester boiler leak goes unattended, the more harm it may do. That's why it has to be fixed as soon as possible. Also, any electrical components that may be submerged in water should be taken extra care of to avoid costly boiler repairs due to corrosion.

There are Banging noises from the boiler

Ketling is the most common cause of boiler sounds in Worcester Bosch systems. This may result from a decline in water pressure, the accumulation of limescale, or a malfunctioning thermostat. Worcester boiler noise should be handled as quickly as possible, as it may lead to more severe problems in the system if left ignored.

The Boiler is in lockout mode

This is when a boiler ceases to function to prevent any further harm from being done. Boilers may lock out for various reasons, including faulty flame sensors, clogged flues or condensate pipes, a lack of fuel or insufficient fuel delivery, or excessive or inadequate boiler pressure.

Clogged Condensate line

A condensing pipe pushes hazardous gases out of your home and into the atmosphere. The cooler months of the year bring with them the possibility of the owners encountering a clogged condensate line, but this problem can be quickly resolved using warm water.

The Boiler is overheating

For example, a clogged condensate line or significant limescale buildup on the heat exchanger might cause your Worcester boiler to overheat. Also, pump or fan failure is another common reason of Worcester boiler overheating. However, it is easy for an expert engineer to identify and fix the problem.

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What are the common Worcester Bosch Boiler Fault Codes?

If you’re having any of the above trouble with your Worcester Bosch boiler, our error code below should help you track the source of the problem.

C6 215: Worcester Bosch Boiler - Fan Speed Error

This fault code indicates that the fan speed in your Worcester Greenstar boiler is too high. A suggestion is to restart your boiler as this might return the fan speed back to normal. If this continues, then contact us at MK City Plumbing and Heating and one of our Gas Safe engineers will visit your property to assist.

9A 362: Worcester Bosch Boiler - Heat Control Module (HCM) Issues

This indicates that the control box or the Heat Control Module (HCM) is defective on your Worcester Bosch. A fault code indicating that the heat control module (HCM) is defective on your boiler, could also be a sign that the incorrect HCM fitted 9U. When you see the fault codes for the Heat Control Module (HCM) is defective an our engineer at MK City Plumbing and Heating needs to be called to check your Worcester Bosch boiler as it may need replacing.

EA 227: Worcester Bosch Boiler - No Flame Signal Due To Blockage or Internal Leak

When this code appears on the control box or dashboard of your Worcester boiler, it can mean several different things. This code indicates an issue with the gas valve, as no flame can be found. This can indicate that the gas valve may need replacing, but it can also be a sign that the gas ratio control valve needs adjusting which you can do yourself. This fault code can also indicate that the condensate discharge pipe is blocked or frozen, in which airflow stopped during operation. This can cause the flue gas thermostat overheat and needs to be solved quickly.

This code can be a sign that the operation is defective. Check the connecting lead as it might show that the electrode or ignition lead has been damaged, which will prevent a flame signal. These are not issues you can handle yourself if they appear on your combi boiler. The codes fault will need to be solved by a boiler engineer or through getting a new boiler if you are no longer under warranty.

A1 281: Worcester Bosch Boiler - Blocked Pump

When this code appears, it means that the pump stuck or running with air in the system, which is an internal error. This can cause air-gas ratio control issues in the Worcester boiler.

Turning the box or heat control reset button can solve this issue in your combi boiler.

If turning the control box or heat on and off again does not solve the issue, an engineer will need to be called.

EF 349: Worcester Bosch Boiler - Minimum Burner Load

This means the primary flow is operating at minimum burner level. Once this is detected, check the safety temperature valve is between 1 and 1.5 pulses, check service mode on the burner control unit if this is the case. The temperature sensor may need replacing.

No Code 212: Worcester Bosch Boiler - Flow Temperature High

This indicates that the flow temperature too high and will need checking to return temperature back to the normal state. This can indicate that the safety temperature limiter has tripped and needs replacing. To restart the temperature flow sensor short circuit, turn the boiler off and on again to trigger the low mains voltage. This should reset the high limit thermostat activated code and prevent the gas thermostat overheat EA codes fault to appear.

EA 229: Worcester Bosch Boiler - Loss Of Ionisation Detected

This shows that there is a loss of ionisation signal detected before burner start or during operation. If the temperature sensor correctly installed, the pressure should be between 1.0 and 1.5 bars. Connections need checking, and the boiler should be reset if ionisation detected after ignition to resolve the issue.

E5 218: Worcester Bosch Boiler - Flow Temperature Sensor Too High

If the flow temperature sensor or hot water temperature sensor on the burner control unit is too high, these boiler error codes will appear. This is not something that you can change in the control box, if the temperature sensor is defective, it will need to be replaced.

2964 B: Worcester Bosch Boiler - Sensor Too High

The signal from the heat exchanger temperature sensor is out of range for the primary flow temperature. The safety or flow temperature can be reset by turning the modulating gas valve anticlockwise to trigger a reset position.

1017 W: Worcester Bosch Boiler - Low Water Pressure

This can be a sign that the water needs topping up in your Worcester boiler. If you are having issues with domestic hot water, then the vent system or pressure sensor may need to be replaced. If the boiler is not under warranty, it may be easier to buy a new boiler.

Code 226: Worcester Bosch boiler - Safety Sensor

This means that a safety sensor has been connected to the blocking error history menu, which can be resolved by restarting the boiler. If this code does not go away, the boiler may no longer be gas safe, and you will need to buy a new boiler.

Please be aware that you should never try to access or mess with your boiler and that a trained Gas Safe Engineer should only perform any repairs.

Are you interested in replacing your boiler and avoiding recurrent Worcester boiler problems?

MK City Plumbing & Heating specialist is here to assist .If there is a problem, one of our highly skilled repair technicians will be on hand to figure it out quickly and efficiently. Whether or not you need a new boiler, our experts can help you with this decision.

Get in touch with us today by calling 01908 464 075 or browse our site for additional information.

Do you need Boiler Finance?

We know that if your boiler cannot be repaired and a new energy efficient boiler is required, then funds may not be available to cover the replacement. Here at MK City Plumbing & Heating, we offer a range of finance options to help cover the cost of the new boiler and installation.

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We offer our range of plumbing and heating services to customers in across the Milton Keynes and all surrounding areas.. It is our aim to offer all our customers an exceptional service from start to finish. Our customers at MK City Plumbing & Heating are paramount to us and this will never change.