Common Baxi Boiler Problems & Repair Advice

Common Baxi Boiler Problems & Repair Advice

Common Baxi Boiler Problems & Repair Advice

Boilers provide heating and hot water to our homes every day, yet it’s easy to forget that they’re even there. When there’s an issue, we immediately remember the responsible appliance.

With our guide to the common Baxi boiler problems, you’ll be able to recognise what’s causing faults and know how to quickly get your home back up and running with heating and hot water. In some cases, you’ll be needing an engineer, get a free boiler repair quote from engineers near you with our service.

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Who are Baxi?

Having been manufacturing in the UK since 1866, Baxi pride themselves on delivering reliability, respect and innovation to the industry. Find out even more about Baxi’s range of boilers on Boiler Guide.

Top 5 Baxi Boiler Problems

  1. Error code E133 or E28

    Seeing either of these error codes means that your condensate pipe may be frozen. The condensate pipe transports acidic water, caused by waste gas, away from the boiler. This usually runs outside into a drain, and because of its location it faces the risk of freezing.

    Frozen condensate pipes can be thawed by having warm water poured over them, if you don’t feel comfortable doing this yourself, call out a registered engineer.

  2. Low boiler pressure

    When looking at your boiler gauge, the needle should be between 1.0 and 2.0. If the pressure drops below this then you’ll need to repressurise it. Use the steps in our guide to low boiler pressure to resolve the issue.

  3. Loud noise when igniting

    There are several potential causes of a leak boiler, it depends where the water is leaking from to determine the cause. The cause in many cases is a broken internal component, such as a pump seal or pressure valve. If the leak is coming from the pressure valve, your boiler pressure may be too high. If it’s coming from the pump seal, it may have become worn out and need replacing.

  4. Hot water fluctuating

    If you have a Combi boiler, depending on the heat output, they only supply one tap at a time. So having several hot taps running at the same time will reduce the flow of hot water. You may have to reduce the flow of water by turning the tap down to increase the temperature.

  5. Not getting hot water

    Not getting any hot water from your taps suggests that the diverter valve is either worn, faulty or stuck. The job of the diverter valve is to open to let water into the heat exchanger when you turn on the hot tap, which closes off the water used for your heating.

Which Boiler Issues Need an Engineer?

Some common boiler problems don’t even need an engineer to resolve, but to know when you will need one, use the table below.

Need a boiler repair?



Problem Possible Cause Do you need an engineer?
No heat or hot water Can be caused by several things including broken diaphragms and airlocks, failure of motorised valves, issues with the thermostat or low water levels Yes
Leaking and dripping Most likely to be a broken internal component but it will depend where the water is leaking from Yes
Banging, whistling or gurgling noises Air in the system could be causing this, otherwise it could be that the water pressure is too low Yes
Pilot light goes out The thermocouple could be broken which is in turn stopping the gas supply Yes
Losing Pressure Could be a water leak in the system, the pressure relief valve needs replacing or due to recently bleeding radiators No, unless there’s a leak
Frozen condensate pipe This fault should be displayed on your boiler as an error code or warning notification Yes
Thermostat issues Thermostat could be turned off or not set to the correct settings (time etc.) Consider replacing
Kettling Limescale or sludge building up on the heat exchanger Yes
Radiators not getting hot Sludge or air building up in the system or an unequal distribution of heat Your radiators will need to be bled which doesn’t require an engineer but if you don’t feel like carrying out the task yourself
Boiler switching itself off Could be low water pressure, a problem with the thermostat or a lack of water flow due to a closed valve, Yes

Error Codes

When there’s a fault with your Baxi boiler, it will display an error code, to know what it means check our handy list of Baxi error codes.

Should You Replace Your Baxi Boiler Instead?

If you’ve had your Baxi boiler for some period of time then you might be thinking about installing a new one. If you live in a detached home then you could be saving up to £305* a year. Use the table below to find out how much you could be saving depending on your current boiler rating and property.

House Type G (<70%) F (70-74%) E (74-78%) D (78-82%)
Semi-Detached £200 £140 £120 £120
Detached £305 £210 £180 £180
Detached Bungalow £155 £105 £90 £90
Mid terrace house £175 £120 £105 £105
Mid terrace house £95 £65 £55 £55

Who Should I Choose to Replace My Baxi Boiler?

Once you know that you want to replace your Baxi boiler with a brand new one, it can be tough to decide who you should get to replace it. One thing is for sure, the person you go with must be a Gas Safe registered.

Your decision will ultimately come down to either a national company or local engineer, so which one is right for you.

If you prefer the personal touch, then with a local engineer you’re likely to talk to the same person throughout your communications. Local engineers can also offer very competitive rates which might sway you.

National companies will be able to offer extra services like ongoing boiler cover and big brand protection which is always a bonus.

We don’t recommend going with the first engineer you talk to so it’s a good idea to get a quote from up to 3 engineers to give you the best chance of getting the perfect deal for you.
For the best chance of getting the right deal for you, we recommend getting up to 3 quotes from different engineers, which you can receive with our free service.

Boiler Insurance and Ongoing Cover

For anyone whose boiler warranty has ended or is coming to end, boiler insurance could be well worth considering. This can be done easily enough with your energy supplier, but there’s absolutely no obligation to do so. If you think boiler insurance is the way to go, then keep an eye out for ones that offer an annual service and safety inspections.

Baxi Boiler Warranty

The majority of Baxi boilers come with anywhere between 2-7 years of warranty as standard. Use our complete guide to Baxi warranties so that you know exactly what to expect. To keep a boiler warranty valid, a service will need to be carried out annually, this means that you’ll need to arrange for a Baxi boiler service for every year of the warranty.

Send us an enquiry today to receive free quotes for a new boiler and find trusted engineers near you with our free service.

*According to the latest figures from the Energy Saving Trust

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