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Common Vokera Boiler Problems


Lee Devlin

Published on: 16/02/2021
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Vokera are a cheaper boiler brand in comparison to companies like Vaillant and Worcester, which does also tend to mean that they run into a few more problems as a result. For many homeowners they offer a cheaper alternative to other brands, although this does often come with a downside of having to pay for additional repairs, and in more serious cases where a replacement is needed it can require new boiler installation.

We’ve put together a troubleshooting guide for Vokera boilers to help you diagnose the problem and also tell you how each one can be solved. In some cases, you will need a Gas Safe registered engineer to help, and if you’re based in London please do get in touch with us and we’ll be very happy to support.

Top 10 Vokera Boiler Problems

Vokera Vision 30c problems

Owners of Vokera Vision boilers can experience issues with the ignition, with loud gurgling noises heard when the boiler is turned on. The ignition part can be easily changed, although if the issue is linked to a faulty PCB board it may be a more expensive issue to resolve.

Vokera Compact 29a problems

Common Vokera Compact 29a problems include the ‘03’ error code. This is typically associated with the fan, as parts used in Vokera boilers tend not to be of the highest quality and can breakdown. Fans are usually quite straightforward to be replaced – and installing the entire fan is usually a better long-term option to reduce the likelihood of it happening again.

Vokera Mynute boiler problems

If you experience fault code ‘73’ or ‘79’ this is one of the common Vokera Mynute 20e problems owners can experience. It indicates a fault return thermistor, which should be a straightforward part to replace if that is the root of the issue. Other Vokera thermostat problems can be linked to a limit temperature fault, while other Vokera thermostat error codes can be linked to low temperature issues.

Vokera Linea 28 problems

Look out for Vokera boiler ‘01’ error code which appears when the boiler fails to ignite. If resetting doesn’t work then get in touch with us to arrange an engineer. Error code ‘03’ appears because of a faulty fan or flue. As above, if resetting does not resolve the issue Homecure will be able to help.

Boiler pressure problems

When it is too low, Vokera boiler water pressure will produce error codes ‘40’, ‘41’ and ‘A04’ on Linea and Compact models. This will mean affect performance levels and a Vokera boiler with low pressure could be due to a leak in the system. If you suspect a leak, get in touch with us right away so an engineer can diagnose and repair.

Flashing red lights

Vokera boilers with a red light flashing indicates a problem that needs to be fixed. On a Compact model it may produce the ‘A01’ code with a red light that showing an ignition issue. Flashing red lights and red lights that remain without flashing will mean different things and will be something our engineers can help fix.

Flashing green lights

When the green light is constantly on it means the flame is working, but a flashing green light could be due to a faulty hot water sensor or because it is in standby. A reset may be enough but if not you may need to get in touch to arrange an engineer to diagnose the issue.

Hot water problems

You may have a problem with the diverter valve if the water is not getting hot or only gets warm when the heating is turned on. This is a common problem with Flowmatic and Unica HE boilers, but it doesn’t always have to mean the entire diverter unit has to be replaced. This is something a Homecure engineer can assess and repair in a short amount of time.

Boiler condensate problems

If the condensate trap or pipe is blocked you will see error codes ‘92’, ‘93’ or ‘95’ displayed. A blocked pipe can usually be unblocked outside by pouring warm water overs it until it thaws. If this doesn’t do the trick there may be debris in the pipe that needs to be cleaned out which can be done by removing the pipe and running water through it.

Boiler kettling problems

When a Vokera boiler is making whistling, banging or gurgling noises it could be due to low water pressure in the system (which could also indicate a leak) or kettling. In either situation you should get in touch with Homecure to arrange for an engineer to visit and resolve the issue for you.

Which Vokera boiler problems need a Homecure engineer?

We are experts at Vokera boiler troubleshooting and can diagnose and repair any problem you are experiencing with your system. Homecure have a team of professional Gas Safe engineers who are available to provide boiler repairs at short notice. Get in touch with us today to make an appointment.

Boiler issue

Possible reason

Should I call a Homecure engineer?

Banging noises or whistling

This could be due to a leak, or could be related to an ignition problem.


No heating or hot water

Can be caused by faulty diverter valves and may produce red flashing lights on the system.


Low pressure

There may be a leak in the system – especially if it continues to happen – or an issue with a valve.

Yes – if it is a leak. If refilling the system to reduce, or bleeding the radiators, to increase the pressure, does not work, get in touch.


Leaks can happen anywhere in the system and may not always be visible. They need to be addressed and fixed right away.


Boiler shutting down

Could be a faulty air pump or thermostat causing the issue and a part needs to be replaced.


Problems with thermostat

Usually a limit or low temperature fault that requires the thermostat to be replaced. May also be related to timing and temperature settings.

Yes – if resetting the timings/temperature does not resolve the problem.

Frozen condensate pipe

Usually just needs warm  water to be poured over the external pipe so it thaws out.

Yes – if after thawing the pipe is still blocked there may be another reason for the issue.

No pilot light

The thermocouple may need to be replaced if the boiler is not lighting up.


Cold radiators

If there is too much limescale or sludge in the system water will struggle to pass through the radiator to warm them up.

Maybe – bleed the radiators to see if this fixes the problem. If not, get in touch with us to arrange a booking.

Kettling noises

This can be another issue related to limescale or sludge in the system that needs to be cleared.

Maybe – bleed the radiators but contact us if the noises persist.

Some of these issues are similar to common Worcester boiler problems and common Vaillant boiler problems, which may also require similar repair work.

FAQs about Vokera boiler problems

How do you reset a Vokera boiler?

To reset a Vokera boiler change the mode selector to ‘Off/Reset’. Then move it back to ‘Heating and Hot Water’ or ‘Hot Water Only’. This should reboot the system so it starts to work again. If not, get in touch with Homecure who can arrange for an engineer to check the boiler.

How long should a Vokera boiler last?

Vokera boilers will last for different lengths of time depending on usage, installation and how well-serviced it is. Vokera boilers come with a 12-month warranty as standard, although this can be extended to up to 7 years.

How do I fix the pressure on my Vokera boiler?

How you fix pressure on a Vokera boiler depends on why the pressure is too high or low. A Vokera boiler can be re-pressurised by following the manual instructions if the bar is below 1. But if you have a leak or another issue it may start to fall or rise again. If this happens a Homecure heating engineer can help fix this.

What should the pressure be on a Vokera boiler?

The pressure gauge on a Vokera boiler should be between 1 and 1.5. If it rises or falls substantially above or below this for an extended period of time you will likely have a pressure issue that needs to be fixed. This is something Homecure engineers diagnose and repair every day.

Why is my Vokera boiler flashing red?

A Vokera boiler flashing red is likely due to a lockout, which will prevent heating and hot water working in your home. There a number of reasons why your Vokera boiler’s light is flashing red and one of our Gas Safe engineers can help quickly resolve this issue.

Why is my Vokera boiler not working?

If your Vokera boiler is not working it could be due to a variety of causes. This can be anything from a faulty PDB board or pump, or even an issue with the gas supply. If your Vokera boiler is not working get in touch with us right away and we’ll arrange for an engineer to visit and repair it.


Lee Devlin
Publication date: 16/02/2021

Lee Devlin is the managing director of Homecure Plumbers, London's favourite local plumbing service. Since 2009, Lee's been leading a large team of gas safe plumbing and heating engineers as well as growing a successful business built on quality customer service and workmanship, in a competitive industry within the Capital. He's been in the game for a long time, so he regularly shares his knowledge and experience with the public. His expert tips have been featured in lots of well known publications such as: The Sun, Metro, Insider, Homes And Gardens, Country Living and more!

Read More About Lee Devlin.

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