Ariston Boiler Not Igniting: How To Resolve


When an Ariston boiler is not igniting, this can be due to many reasons. This article will discuss the main reasons why Ariston boilers don’t ignite. We’ll also take a look at the Ariston spare parts available from Suner.

Solutions for Ariston boilers not igniting

The tips we give are merely indicative and a technician will be in a better position to determine which of these tips apply in your case. The user manual can help you if you need some more details, in addition to the ones we provide. You can download your user manual from Ariston Spain’s official website. Let’s take a look at some of the causes and solutions for an Ariston boiler not igniting.

The first cause: problems with the gas supply

Failure in the gas supply can have various causes: gas cut on the street, a faulty meter, empty gas cylinder, faulty regulator, air in the gas installation, broken or open gas inlet cock,etc. Each of these items should be repaired and, if necessary, the faulty parts should be replaced with new ones.

Excess temperature due to smoke expulsion problems

If the ignition problem doesn’t happen when igniting the boiler for the very first time but during a normal restart, the problem may be with the flue. The smoke vents and chimneys are responsible for not only expelling residual combustion gases but also for getting rid of the excess temperature generated by fuel burning.


In addition, this is also the reason that condenser boilers are considered less polluting as they emit fewer toxic gases into the atmosphere. They also emit waste gases at a fraction of the temperature to that emitted by regular boilers.

However, if for some reason these residual gases can’t be expelled, all the very hot smoke remains inside the boiler, resulting in the unit not igniting as it cannot complete its gas expulsion and temperature shedding process before the next cycle.

The solution for this is to clean out the smoke outlet and chimney. There are several ways to do this, from the more traditional methods to the most modern ones. You can do it yourself, but a professional chimney sweeper could do it quicker and more efficiently.

Turbine stuck or in a poor condition

A malfunctioning turbine is something that is closely related to excess temperature. Condensing boilers have watertight technology meaning that they are also watertight boilers. This means that their combustion chambers are completely isolated from the room in which they are situated.

Watertight boilers bring in the air directly from the atmosphere by means of a tube. They expel the fumes to the atmosphere directly through another tube (which can be concentric or coaxial tubes). An essential component of the airtight system is the turbine, which is responsible for absorbing the air for the combustion process while, at the same time, driving the expulsion of the residual combustion gases with the air.


If the turbine becomes clogged or breaks down, there won’t be any air for combustion or fume expulsion. As a result, the boiler detects the excess temperature of the smoke and stops working until the situation returns to normal. If this happens, you should call a technician in to unblock the turbine or replace it with a new part.

Browse turbine spare parts for sale at Suner

Clogged circulation pump

If the circulation pump has become clogged, it will, in one way or another, prevent the boiler from igniting or restarting. On the other hand, if there is little or no water flow, this will cause the pressure in the system to plummet, which will be enough to prevent the boiler from igniting. However, if this doesn’t happen, the fact that there is no water will increase the temperature and prevent it from igniting.

The circulation pump can be unblocked quite easily if you can locate the unusual-looking plug with a groove covering the shaft. With a blunt, flat screwdriver (a wide-blade screwdriver, for instance), you can turn the shaft until the pump unlocks. If you can’t unblock it properly, you may need to replace it with a new one.


Broken expansion vessel or no air

The expansion vessel is one of the boiler’s safety components. Its function is to absorb pressure shocks from the system, especially during the most critical moments of the ignition process. If the expansion vessel’s sensitive membrane can’t absorb the excess pressure, the pressure can build up. One of the ways a boiler reacts to this kind of situation is to freeze, not ignite, or not restart.


When this happens, it is a sign that either the expansion vessel membrane is broken or calcified, or the expansion vessel needs to be refilled with air. If this is the problem, when the vessel works properly again, the boiler will ignite. We have compiled a tutorial with all the details you need on what to do if your expansion vessel has failed, and here is the link: A simple and step-by-step process on how to repair your boiler’s expansion vessel.

Click here to browse expansion vessels for sale at Suner

Browse Ariston spare parts for sale at Suner

Suner has a very well-stocked catalog of spare parts for Ariston boilers. By making us the spare parts supplier of your choice, you can be assured of an uninterrupted supply of original and high-quality parts at the most competitive prices. We also offer fast and safe delivery.

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