Ariston boiler: main errors and how to understand them


In this article, we list the most common errors with Ariston boilers and how to interpret them correctly. Ariston boilers are known for combining comfort and elegance with great fuel efficiency and low polluting emissions. It pays to know its breakdowns and understand its well thought out error code. You can also see the Aristonspare parts that we have available at Suner.

How to read error codes on Ariston boilers

Ariston boilers have their own system of error codes (like most boilers). Whenever the boiler processor detects a problem that hinders or prevents correct operation, in order to prevent the breakdown from escalating, it causes a lockout and displays an error code that gives clues (quite accurate, but not always) about the problem. We will look at what may be happening.

Ariston boilers come equipped with a very user-friendly control panel, even if you are not a technician or have specialist boiler knowledge. Said panel incorporates a display or small digital screen that facilitates the reading of the error codes on the Ariston boiler.

In Ariston boilers errors are divided into 2 groups:

  • Volatile errors in the Ariston boiler: The so-called “volatile errors” are more like “safety shutdowns” that the boiler makes. They have the objective that the boiler corrects itself without human intervention, restarting automatically to continue working normally.
  • Non-volatile errors in Ariston boiler: The term “non-volatile errors” means that the boiler has a true fault, in the sense that said the problem does not correct itself, but rather, unlike the “volatile errors”, it does require human intervention to fix it, either by rearming or resetting the boiler or by solving faults with the parts or replacing them with spare parts.

Click here to access all Ariston spare parts for sale at Suner



One more detail. Each error code on the Ariston boiler is located in a specific functional group. The first number of the error code indicates to which functional group it belongs, and this indicates in which part of the boiler or circuit the fault is located. These are the functional groups:

  1. Main Circuit
  2. Sanitary Circuit
  3. Internal electronic part
  4. External electronic part
  5. Ignition and Flame Detection
  6. Air inlet and smoke outlet

Taking into account the above list, we have, for example, the error code 203 indicates that the error is part of functional group 2, and therefore the fault has occurred in the Sanitary circuit. Another example: If the boiler indicates an error 610, this implies that the fault is located in some component of the air inlet or smoke outlet. Having placed ourselves in these functional groups, the manual goes on to describe the errors in detail.

Ariston boilers errors and how to interpret them

Here we will present all the errors in the Ariston boiler and what faults they indicate, taking as a reference the Class One model manual (as it is a fairly popular model, although the errors apply to other models). As will be seen, the solutions for the breakdowns are not indicated, just as they are not indicated in the manual. The most convenient thing is that the faults are solved by a qualified technician, since many factors must be taken into account at the same time, to determine which of all possible errors is the problem and which is the exact solution.

Ariston boiler volatile errors
101Excess temperature.
102The pressure sensor is shorted or disconnected.
103Insufficient circulation in the heating circuit.
108Filling the installation.
109Excess pressure in the installation: greater than 3 bars.
110Open circuit or short circuit in the heating delivery probe.
112Open circuit or short circuit in the heating return sensor.
114Open DHW circuit or short circuit in the external probe.
116The floor thermostat is open.
118Fault in the primary circuit probe.
1P1The water circulation is insufficient (problems with the circulation pump).
201Open circuit or short circuit in the domestic hot water circuit probe.
203Open circuit or short circuit in the accumulator probe (System).
205DHW inlet NTC probe open.
209Excess temperature in the accumulator (System).
301EEPROM display error.
302Communication error.
303Main board error.
304Excessive reset attempts (more than 5) in 15 minutes.
305Main board error.
3P9Notification that maintenance is needed (once a year).
411Open circuit or short circuit in room probe Z1.
412Open circuit or short circuit in room sensor Z2.
413Open circuit or short circuit in the room probe Z3.
501There is no flame.
502Flame detected even though the gas valve is closed.
504Putting out flame
5P1 (SP1)Failed on first power-up attempt.
5P2 (SP2)Failed on second power-up attempt.
5P3 (SP3)Putting out flame
601Smoke probe intervention.
607Smoke pressure switch authorization prior to the ignition sequence.
608Without authorization from the smoke evacuation pressure switch with the fan on.
610The fan speed is not enough.
612Open thermofuse.
6P1Delay in authorization of the flue gas pressure switch.
6P2Smoke evacuation pressure switch authorization before ignition sequence.

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