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A Guide To Boiler Fault Codes

It can be hugely inconvenient to have something go wrong with your home’s boiler, especially if you have no idea what the fault is or where it might have come from.

 

However, many UK boilers include a range of error codes that can assist owners in identifying what the problem is, which will in turn allow you to decide whether or not it’s time to call someone out to take a look.

 

Here are the most common boiler fault codes associated with boilers from the Vaillant, Baxi, Ferroli and Worcestor lines, as well as our advice on how to handle them.

 

Vaillant Boiler Fault Codes

 

Here are the most common boiler fault codes that may be encountered by those using a Vaillant boiler, as well as what exactly each code indicates.

 

F22: This code indicates that your boiler is running at low pressure and needs to be topped up or increased.

 

F75: The F75 code indicates another pressure problem, though this issue is likely related to the boiler’s pressure sensor, pump or that the boiler’s heat exchanger could be blocked.

 

F32: This code indicates that there is likely a problem with your boiler’s air system, which points to fan failure, blocked flue pipe, internal leak or a communication breakdown between the fan and circuit board.

 

F76: The F76 code indicates a fault with the heat exchanger. This may be a more serious problem and may mean that your heat exchanger or boiler as a whole will need replacing – in this case, it’s best to give Vaillant a call and report the issue.

 

F28: This code means that the boiler has failed to ignite and that there is no active flame within the boiler, leaving your home with no means of central or water heating.

 

Baxi Boiler Fault Codes

 

Here are the most common boiler fault codes that may be encountered by those using a Baxi boiler, as well as what exactly each code indicates.

 

 

E119: This code indicates that your boiler is working with low water pressure. If you see this code, try adjusting your to 1 – 1.5 bar.

 

E133: This code means that the boiler has failed to ignite and that there is no active flame within the boiler, leaving your home with no means of central or water heating.

 

E125: This code indicates that the boiler has exceeded its maximum temperature. If you see this code, vent your radiators, check that the water pressure on the gauge is ample and check that the bypass radiator is open.

 

E168: The E168 error code indicates that the boiler’s PCB (printed circuit board) is ‘confused’. This can sometimes be solved by resetting the boiler for five seconds.

 

E110: This error code indicates a very similar problem to the E125 code, in that the boiler may have exceeded its maximum temperature. Many of the same fixes for the E125 code could come in useful here, so be sure to try these.

 

Ferroli Boiler Fault Codes

 

Here are the most common boiler fault codes that may be encountered by those using a Ferroli boiler, as well as what exactly each code indicates. Some Ferroli boilers indicate faults using flashing lights, too, which are also covered below.

 

F5: This error code is fairly common and relates to a handful of different issues, including an issue with the fan, the PCB or the air pressure switch. It may also be asking that you carry out a clean and adjustment of the unit.

 

F37 (or flashing green light): This code indicates that your boiler is running at low pressure and needs to be topped up or increased.

 

A01/F01 (or constant red light): These are indications of an ignition failure, meaning that the boiler has failed to ignite and cannot provide central heating or hot water.

 

F40: This is a sign that the pressure on the gauge is too high. You may be able to fix this issue by venting a radiator until the pressure falls back down to around 1.5 bar, though this may not work every time.

 

A03/F03: These codes indicate that the boiler has exceeded its maximum temperature. If you see this code, vent your radiators, check that the water pressure on the gauge is ample and check that the bypass radiator is open.

 

D1: This isn’t a fault code, instead meaning ‘delay’ – it simply means that someone within your home has recently used the hot water.

 

D2: This isn’t a fault code, instead meaning ‘delay’ – it simply means that the hot water has reached its set temperature. If this code is showing but you do not have hot water, you should call out a repair.

 

Worcester Boiler Fault Codes

 

Worcester boilers are rather different in that there are only two common fault codes, with one relating to multiple issues.

 

C6: This code commonly relates to fan failure.

 

EA: The EA code is an indication of several possible issues, including a fault gas valve, faulty electrodes, faulty flame rectification, no gas or low gas.

 

Can’t Fix It? Call Us.

 

If you’re experiencing any of the above issues and have been unable to fix them using brand-specific troubleshooting instructions, have a code showing up that is not listed above or have a further issue with your boiler, get in touch with us.

 

Here at Birmingham Boiler Repairs, we make no secret of how delighted we are that so many customers choose us time and time again, to meet their boiler servicing, repair and inspection needs in Birmingham, Bromsgrove, Redditch and Dudley – and we’d be more than happy to help you, too!

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