Common Ariston Boiler Problems & Repair Advice

Common Ariston Boiler Problems & Repair Advice

Ariston repair and boiler problems advice

If there’s an issue with your boiler, it’s easy to start cursing your faithful boiler but it doesn’t have to be that way. If you have an Ariston boiler, this guide to the most common problems that you could experience will help you through the hard times and could even see you fixing a fault yourself.

Should you be in any doubt at all or identify a fault that needs an engineer, you can get a free boiler repair quote with our service.

Need a boiler repair?



Who are Ariston?

Ariston have been providing high-quality and efficient heating and hot water products to customers in more than 150 countries for over 50 years. Get to know even more about Ariston right here on Boiler Guide.

Top 5 Ariston Boiler Problems

  1. Low boiler pressure

    Low boiler pressure can lead to the central heating system not functioning as well as it should. To check the boiler pressure, simply take a look at the pressure gauge and if it shows anything below 1 then you may have an issue. Use our guide to low boiler pressure to find out even more.

  2. No hot water

    When there’s no hot water in your home, there are a few possible causes, broken diaphragms and airlocks, issues with the thermostat, low water levels or failure of motorised valves. Always check if the boiler pressure or your thermostat are causing the issue.

  3. If you’ve identified that your boiler needs a new part or are unsure, then you’ll need a Gas Safe registered engineer to diagnose the issue and replace any broken parts.

  4. Boiler is leaking

    The vast majority of boiler leaks are caused by a broken internal component but depending on where the leak is coming from, it’s something that will need to be looked at by an engineer.

  5. Error code A41

    If you’re seeing error code A41 then your boiler’s fan is faulty. Start off by checking the fan using the voltmeter. If the fan is receiving the required power but is refusing to run then you’ll need to replace it. Should the fan not be receiving enough power, take a look at the PCB. This is something you will need to contact a Gas Safe registered engineer to take a look at.

  6. Mechanical timer not working

    If your Ariston boiler is a few years old then you may find that the mechanical timer doesn’t work as well as it once did. Some possible causes are damaged ignition wires, a faulty PCB, or trouble with the thermostat.

  7. Which Boiler Issues Need an Engineer??

    Identify the possible cause of a fault with your boiler using the table below, it will also let you know if you’ll need an engineer.

    Need a boiler repair?



    Problem Possible Cause Do you need an engineer?
    No heat or hot water Broken diaphragms and airlocks, failure of motorised valves, issues with the thermostat or low water levels Yes
    Leaking and dripping Most common cause is a broken internal component but it will depend where the water is leaking from Yes
    Banging, whistling or gurgling noises A common cause is air in the system, alternatively it could be that the water pressure is too low or it’s kettling Yes
    Pilot light goes out Could be a broken thermocouple which is stopping the gas supply Yes
    Losing pressure There could be a water leak in the system, the pressure relief valve needs replacing or the radiators have been bled recently Only if there’s a leak
    Frozen condensate pipe Your boiler should display a fault code or warning notification Yes
    Thermostat issues Thermostat may be turned off or not set to the correct settings (time etc.) Consider replacing
    Kettling Limescale or sludge building up on the boiler’s heat exchanger Yes
    Radiators not getting hot Sludge or air build up in the system or an unequal distribution of heat You will need to bleed the radiators which doesn’t require an engineer unless you don’t feel like carrying out the task yourself.
    Boiler keeps switching itself off Could be low water pressure, a problem with the thermostat or a lack of water flow due to a closed valve, air in the system or the pump not circulating the water in the system correctly Yes

    Error Codes

    When there’s a fault with your Ariston boiler, an error code will display on the screen to help you identify the issue. Familiarise yourself with the error codes using our list of Ariston error codes.

    Should You Replace Your Ariston Boiler Instead?

    If your Ariston boiler has been heating your home for a long period of time, it might be worth considering a new one. A new boiler could be saving you up to £305* a year in a detached home. Take a look at the table below to see 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 Ariston Boiler?

    If you’re looking to replace your Ariston boiler then you’ll be needing a Gas Safe registered engineer to carry out the installation, but would you prefer a local engineer or national company?

    Local engineers are likely to offer very competitive rates and should deliver a personal service throughout your communications with them.

    While branded manufacturers may cost slightly more than a local engineer, you’ll be covered by big brand protection and they could provide extra services such as ongoing boiler cover. When considering engineers, we recommend getting up to 3 quotes from different engineers. Using our service you can get free quotes from reliable engineers near you.

    Boiler Insurance and Ongoing Cover

    If your boiler warranty has ended or will be coming to an end soon, it might be worth considering boiler insurance. This insurance can be taken out with your energy supplier, but there’s absolutely no obligation to do so. When comparing boiler insurance, keep an eye out for ones that offer annual service and safety inspections.

    Ariston Boiler Warranty

    Many Ariston boilers have a 2 year warranty as standard but having recently introduced 8 and 12 year warranties on some boilers you could be well looked after. Use our guide to Ariston warranties for more information.

    Find trusted engineers near you with our free service by sending us an enquiry today.

    *According to the latest figures from the Energy Saving Trust

    Get Ariston Boiler Quotes

    Get quotes to supply and fit a new Ariston boiler now