A Quick Guide To Fix 8 Worcester Bosch Boiler Error /Fault Codes

Worcester Bosch Boilers are very suitable and comfortable for your home as they are available in various types like gas, propane (LPG), and oil fuel types. They have a wide range of boilers including compact models that will fit into your kitchen cupboard.

We know that buying a new boiler can be a daunting and confusing task. Sometimes there are some errors or faults that cause problems using boilers easily.  If you have a Worcester Bosch Boiler installed in your home, it is a good idea to be aware of some of the common problems they have experienced. There are various types of error or fault codes.  Due to these errors, you can notice leaking boiler, banging noises, Boiler lockout, Overheating boiler, No power, No hot water or low Boiler Pressure, and various other issues. When this happens, your boiler might go into what’s called a ‘lockout mode’ which is a safety feature that prompts the boiler to shut down when it develops a fault.

1. LOW BOILER PRESSURE

When the system is cool, the pressure gauge on a Worcester boiler should be between 1 – 1.5 (in the green section). Worcester boiler water pressure issues are common, especially when you are using it for some time. When water pressure is low on a Worcester boiler it can potentially damage the system and stop it from working properly.

 2. LEAKING BOILER

A leaking Worcester boiler should be dealt with quickly, as the longer the leak continues, the more damage it can create. This is especially true of any electrical parts that can come in contact with water which can lead to explosive and dangerous problems and expensive boiler repairs.

3. BANGING NOISES

More often than not, Worcester Bosch boiler problems that create noises will be due to kettling. This is a consequence of a drop in water pressure, limescale build-up, or a faulty thermostat. A Worcester boiler making noise should be addressed as soon as possible as if left unattended it can also create wider issues in the system.

4. BOILER LOCKOUT

Worcester boilers with error 227 codes mean the unit has locked out as a safety precaution. This shuts down its operation to prevent any further damage from being caused. There can be any number of reasons for this to happen, from blocked flues to high or low boiler pressure.

5. BLOCKED CONDENSATE PIPES

Worcester Bosch boilers feature a condensing pipe, which vents harmful gases away from your property. Owners do sometimes experience a blocked condensate pipe during the colder months of the year, but this can be easily fixed with warm water.

6. OVERHEATING BOILER

Your Worcester boiler could overheat because of a faulty pump or fan, a blocked condensate pipe, or excessive limescale on the heat exchanger. The cause can be quickly identified and resolved very easily by an experienced engineer.

7. NO POWER

If the boiler has lost all power it could be because of many reasons whether it can be a faulty electronic control board, a tripped spur socket, or a residual current device (RCD). It can differ in certain cases and may be costly for a new installation.

8. NO HOT WATER

Worcester boiler problems with no hot water is a common problem and one that could be caused by several different things. This could be anything from a faulty diverter or Y/S-plan valve or issues with the PCB unit or heating pump. For example, dirt and grit that has passed through the mesh of flow turbine of a Worcester Junior 28i Combi boiler can.

9. RADIATORS NOT HEATING UP

Worcester boiler problems with no heating can often be resolved quite easily. If there is a build-up of air or sludge in the system it could be the reason why you are not getting the most out of your radiators. This will need them to be bled which can be done with a radiator key without an engineer. Some cases may require a flush out to clear the system but this is not often the case.

10. BOILER TURNS OFF ITSELF

Low water pressure, thermostat issues or a closed valve causing water flow issues could be the reason why your boiler repeatedly switches itself off. Boiler servicing by a reputable company will be able to diagnose the cause and offer a solution that stops this from occurring.

FAULT TYPE	WHAT YOU WILL SEE ON THE BOILER DISPLAY
FAULT ERROR	AN ALPHANUMERIC FAULT CODE WILL APPEAR TO INDICATE THE FAULT GROUP (SEE TABLE BELOW).
LOCKING ERROR	YOUR BOILER WILL FLASH A WARNING TRIANGLE AND FAULT CODE, AS WELL AS A STATIC CAUSE CODE. ONCE THE FAULT IS FIXED, YOU CAN PRESS THE RESET BUTTON ON YOUR BOILER TO CLEAR THE FAULT CODE.
BLOCKING ERROR	NO FAULT CODE WILL APPEAR, EVEN THOUGH YOUR BOILER WILL STOP OPERATING. TO ACCESS THE INFO MENU TO FIND THE CAUSE CODE, PRESS THE SPANNER/RETURN BUTTON. THE ERROR WILL AUTOMATICALLY RESOLVE ONCE THE FAULT HAS BEEN CLEARED. FOR EXAMPLE, IF THE BOILER IS WAITING FOR AN AREA TO COOL DOWN, THE ERROR WILL DISAPPEAR ONCE THAT AREA IS COOL.
CAUSE ERROR	A CAUSE ERROR CODE IS A THREE DIGIT NUMBER THAT MUST BE ACCESSED VIA THE INFO MENU, WHICH CAN BE DONE BY PRESSING THE SPANNER/RETURN BUTTON.
MAINTENANCE CODE	MAINTENANCE CODES START WITH THE LETTER H FOLLOWED BY A NUMBER. ALTHOUGH THE CODE IS TELLING YOU THAT A QUALIFIED ENGINEER IS REQUIRED, A MAINTENANCE CODE THAT HAS APPEARED ON THE DISPLAY WILL NOT STOP YOUR BOILER FROM WORKING.

Worcester Bosch Boilers have developed different error codes or fault codes to help you out with any kind of problem you are facing with your boiler. It helps the engineer to diagnose your problem easily. If your Boiler display is showing a fault code, you can refer to the table to diagnose the exact cause.

Types of Worcester Bosch Boiler Fault Codes

FAULT CODE	CAUSE CODE	POSSIBLE CAUSE
C7	214	FAN IS NOT RUNNING AT ALL
C7	217	EITHER THE FAN IS NOT RUNNING OR THE AIRFLOW IS BLOCKED
D1	240	SENSOR IS WET OR DAMAGED – THE BOILER WILL USUALLY BLOCK FOR 300 SECONDS BEFORE THE FAULT CODE APPEARS
D1	241	SENSOR IS DAMAGED OR DISCONNECTED – THE BOILER WILL USUALLY BLOCK FOR 300 SECONDS BEFORE THE FAULT CODE APPEARS
D1	286	BOILER IS OVERHEATING
E2	222	FLOW SENSOR HAS SHORTED OR IS DAMAGED
E2	223	FLOW SENSOR IS DAMAGED OR DISCONNECTED
E5	218 OR 332	PRIMARY FLOW SENSOR HAS OVERHEATED
E9	219	MAIN HEAT EXCHANGER HAS OVERHEATED
E9	220	MAIN HEAT EXCHANGER MAXIMUM TEMPERATURE SENSOR HAS FAILED
E9	221	MAIN HEAT EXCHANGER MAXIMUM TEMPERATURE SENSOR HAS NOT BEEN RECOGNISED
E9	224	FLUE GAS THERMOSTAT HAS OVERHEATED
EA	227	FAILURE OF FOUR ATTEMPTS AT IGNITING THE BOILER – WILL NEED TO WAIT AT LEAST 30 SECONDS BEFORE MAKING ANOTHER ATTEMPT
EA	229	ESTABLISHED FLAME HAS BEEN EXTINGUISHED – POSSIBLE CAUSES INCLUDE A BLOCKED SUMP OR STRONG WIND INTO THE FLUE
EA	234	GAS VALVE COIL IS DISCONNECTED
EA	261	NO FLAME HAS BEEN ESTABLISHED DURING THE FIRST 4 SECONDS OF IGNITION PERIOD
EA	338	PUMP IS NOT DETECTING WATER – CHECK PRESSURE GAUGE AND RE-PRESSURISE TO 1 BAR

Worcester Bosch Boiler Blocking Error Codes

A1	281	LOW WATER IN THE SYSTEM OR NONE AT ALL – CHECK PRESSURE GAUGE AND RE-PRESSURISE TO 1 BAR
C1	264	FAN HAS STOPPED WORKING
EA	227	NO FLAME HAS BEEN DETECTED – BOILER WILL BLOCK DURING 4 ATTEMPTS THEN GO TO LOCKING FAULT
EF	349	BOILER IS OPERATING AT MINIMUM BURNER LOAD AND THERE IS A GREATER FLOW AND RETURN TEMPERATURE THAN 18 DEGREES
NO CODE	212 OR 213	AIRLOCK OR REDUCED WATER CONTENT – CHECK PRESSURE GAUGE AND RE-PRESSURISE TO 1 BAR
NO CODE	260	SENSOR IS DISCONNECTED OR NO WATER CONTENT – CHECK PRESSURE GAUGE AND RE-PRESSURISE TO 1 BAR

Managing a boiler can be a daunting task if you are not aware of the common errors which appear while the boiler is being used. The fault codes are not so complex that it can’t be understood. The proper guide of the common fault codes and their causes can be found in this article. Whatever problems you are facing with your boiler, these error/fault codes will be highly efficient and easy to detect the problem and can be diagnosed.