Last updated on: 29 August 2024

List Of Ariston Boiler Error Codes and Problems: A Complete Guide

Ariston boilers utilise sophisticated technology and software to ensure your home’s consistent and reliable heating. However, like any electronic device, they can encounter issues requiring troubleshooting.

Ariston boilers come equipped with an array of error and fault codes that provide detailed information about the nature of their malfunctions. Pay close attention to these codes to accurately diagnose the problem before taking corrective action, whether calling a professional for repair or attempting a DIY fix. Understanding these error and fault codes is crucial, as they prevent further damage from occurring while increasing safety and efficiency levels.

This article will list all the Ariston boiler error codes and discuss the top 7 Ariston boiler problems and their solutions.

Before we move any further, let’s see a quick overview of the Ariston boilers:

Ariston Boiler Overview

Ariston is a leading manufacturer of advanced, high-performance boilers that provide reliable and efficient heating solutions for residential and commercial spaces. They offer an extensive range of products, including combi boilers, system boilers, and conventional models with various features to suit different needs. The company uses the latest technology and innovations in the industry to deliver high-quality boilers that are easy to install, use, and maintain.

Ariston boilers are also energy-efficient and environmentally friendly, reducing carbon emissions and helping homeowners save on energy bills in the long run. With more than 50 years of experience in this field, Ariston has established itself as a trusted brand that provides excellent customer service, expert technical support, and competitive product pricing.

List of All Ariston Boiler Error Codes

1. Central Heating Circuit Issues

Fault CodeBoiler ModelPossible Cause
Ariston boiler error 101All BoilersOverheat
Ariston boiler error 102E-Combi Evo
E-System Evo
Clas He Evo (Combi and system)
Pressure sensor error
Ariston boiler error 103All BoilersInsufficient circulation
Ariston boiler error 104All BoilersInsufficient circulation
Ariston boiler error 105All BoilersInsufficient circulation
Ariston boiler error 106All BoilersInsufficient circulation
Ariston boiler error 107All BoilersInsufficient circulation
Ariston boiler error 108All Combi BoilersInsufficient water (request filling)
Ariston boiler error 109Clas net one / Clas one Combi
Clas system one
System pressure greater than 3 bar
Ariston boiler error 110All BoilersCentral heating Flow temperature probe circuit open/short circuit
Ariston boiler error 112All BoilersCentral heating Flow temperature probe circuit open/short circuit
Ariston boiler error 114All BoilersExternal sensor circuit open/short circuit
Ariston boiler error 116All Combi and System BoilersFloor thermostat contact open
Ariston boiler error 118All BoilersHeating delivery probe problem
Ariston boiler error 1p1All BoilersInsufficient circulation indication
Ariston boiler error 1p2All BoilersInsufficient circulation indication
Ariston boiler error 1p3All BoilersInsufficient circulation indication
Ariston boiler error 1p4Clas Net one Combi
Clas one Combi
Clas System one
Insufficient circulation indication

2. Hot Water Circuit Issues

Fault CodeBoiler ModelPossible Cause
Ariston boiler error 202Clas HE evo
Clas he evo system
E-combi evo
E-system evo
2 bottom storage temperature probe open/short circuit
Ariston boiler error 204Clas HE evo
Clas he evo system
E-combi evo
E-system evo
Solar collector temperature probe open/short circuit
Ariston boiler error 205E-combi one
E-System one
Clas Net one Combi
Clas one Combi
Domestic hot water in probe open circuit
Ariston boiler error 207Clas HE evo
Clas he evo system
E-combi evo
E-system evo
Solar collector overheating
Ariston boiler error 208Clas HE evo
Clas he evo system
E-combi evo
E-system evo
Collector frost protection temperature

3. Internal Printed Circuit Board (PCB) Issues

Fault CodeBoiler ModelPossible Cause
Ariston boiler error 301All BoilersEEPROM error
Ariston boiler error 302All BoilersCommunication error
Ariston boiler error 303All BoilersMain printed circuit board (PCB) error
Ariston boiler error 304All BoilersToo many resets (> 5) in 15 minutes
Ariston boiler error 305All BoilersMain printed circuit board (PCB) error
Ariston boiler error 306All BoilersMain printed circuit board (PCB) error
Ariston boiler error 307All BoilersMain printed circuit board (PCB) error
Ariston boiler error 3p9E-combi one
E-System one
Clas Net one Combi
Clas one Combi
Clas System one
Schedule service

4. External Printed Circuit Board (PCB) Issues

Fault CodeBoiler ModelPossible Cause
Ariston boiler error 407Clas HE evo
Clas he evo system
E-combi evo
E-system evo
Room sensor circuit open/short circuit

5. Ignition & Detection Issues

Fault CodeBoiler ModelPossible Cause
Ariston Error 501All BoilersNo flame detected
Ariston Error 502All BoilersFlame detected with gas valve closed
Ariston Error 504All BoilersFlame lift
Ariston Error Sp1 or 5p1All Boilers1st ignition failed
Ariston Error 5p3All Boilers2nd ignition failed
Ariston boiler error 5p4All BoilersFlame cut-off

6. Air Inlet / Flue / Gas Outlet Issues

Fault CodeBoiler ModelPossible Cause
Ariston boiler error 604CLAS HE R
E-Combi Evo
E-System EVO
Clas HE evo Combi
Clas HE evo System
Insufficient fan speed
Ariston boiler error 610All BoilersThermofuse open
Ariston boiler error 612Clas HE Evo Combi
Clas He Evo System
E-Combi Evo
E-system Evo
Clas net one combi
Clas one combi
Clas system one
Fan speed has incorrect measurement

7. Multi-Zone Heating Issues

Fault CodeBoiler ModelPossible Cause
Ariston boiler error 701E-Combi Evo
E-System EVO
Clas HE evo combi
Clas he evo system
Zone 2 outgoing sensor defective
Ariston boiler error 702E-Combi Evo
E-System EVO
Clas HE evo combi
Clas he evo system
Zone 2 return sensor defective
Ariston boiler error 703E-Combi Evo
E-System EVO
Clas HE evo combi
Clas he evo system
Zone 3 outgoing sensor defective
Ariston boiler error 704E-Combi Evo
E-System EVO
Clas HE evo combi
Clas he evo system
Zone 3 return sensor defective
Ariston boiler error 705E-Combi Evo
E-System EVO
Clas HE evo combi
Clas he evo system
Hydraulic separation sensor defective
Ariston boiler error 706E-Combi Evo
E-System EVO
Clas HE evo combi
Clas he evo system
Zone 2 overheating
Ariston boiler error 707E-Combi Evo
E-System EVO
Clas HE evo combi
Clas he evo system
Zone 3 overheating

 

Get a new boiler
today!

Get your new boiler and save your heating bill yearly with new energy efficient boiler.

Get a Quote Now

TrustPilot Widget

 

Ariston System Boiler Errors and Fault Codes: Clas Net One, Clas One, E-Combi, and E-System Boilers

1. External Printed Circuit Board (PCB) Issues

Fault CodeBoiler ModelPossible Cause
Ariston boiler error 411Clas Net one
Clas one
E System
Room sensor circuit open or short circuit zone 1
Ariston boiler error 412Clas Net one
Clas one
E System
Room sensor circuit open or short circuit zone 2
Ariston boiler error 414Clas Net one
Clas one
E System
Room sensor circuit open or short circuit zone 3

 

2. Multi-Zone Heating

Fault CodeBoiler ModelPossible Cause
Ariston boiler error 701Clas Net one
Clas one
E System
Send sensor defective (Zone 1)
Ariston boiler error 702Clas Net one
Clas one
E System
Send sensor defective (Zone 2)
Ariston boiler error 703Clas Net one
Clas one
E System
Send sensor defective (Zone 3)
Ariston boiler error 711Clas Net one
Clas one
E System
Return sensor defective (Zone 1)
Ariston boiler error 712Clas Net one
Clas one
E System
Return sensor defective (Zone 2)
Ariston boiler error 713Clas Net one
Clas one
E System
Return sensor defective (Zone 3)
Ariston boiler error 722Clas Net one
Clas one
E System
Overheating in zone 2
Ariston boiler error 723Clas Net one
Clas one
E System
Overheating in zone 3
Ariston boiler error 750Clas Net one
Clas one
E System
All heating zones locked

 

Ariston Boiler Top 7 Error Codes

Most Common 07 Ariston Boiler Error Codes

Above, we have mentioned the list of various Ariston boiler codes so that you know the reason behind the fault. But now we will discuss the top 7 error codes that homeowners commonly face.

1. Ariston Boiler Error Code 108: Low Water Pressure

One of the most common problems faced with the Ariston boiler is low water pressure, which displays error code 108 on your boiler. Low water pressure is generally the result of leakage somewhere in your central heating system. However, this problem is not very critical but needs to be dealt with as quickly as possible. It is suggested that you contact a gas safety engineer and let him inspect the problem in detail. Meanwhile, you can take the following preventive measures, mentioned below:

Safety measures:

Try finding the leaky spot or checking for cold radiators. After that, check the pressure gauge rating between 1.5 bars. If all these boxes are checked, contact a Gas Safe engineer immediately, as he will deal with the leakage, bleed out your radiators, and top up your boiler’s water pressure.

In some cases, the problem is related to other factors; to learn about them, read our detailed blog: What to Do If Your Boiler Pressure Is Low.

2. Ariston Boiler Error Code (301–407): PCB Error

Another standard fault code that bothers UK homeowners is the PCB error fault code. As it sounds, this indicates faults with the PCB. These error codes can be caused for various reasons, including power surges, short circuits, or faulty components. This problem is critical, as the PCB is the central nervous system of your boiler. The error code that will be displayed is the following:

  • 301
  • 302
  • 303
  • 304
  • 305
  • 306
  • 307
  • 3p9
  • 407

Safety measures:

As the PCB is your boiler’s internal component, you should never attempt to fix it yourself and contact a Gas Safe registered engineer. Let him inspect the problem, as sometimes the issue is related to the loose wire, which can be dealt with quickly, but sometimes a few components of the PCB get damaged, making you look for a boiler PCB replacement, which is a hefty expense.

Read more about: How to diagnose boiler PCB faults

3. Ariston Boiler Error Code A41: Fan not working correctly

Ariston boiler fault code A41 indicates a malfunction in the boiler’s fan. The most common cause of this issue is the buildup of dirt and debris on the fan, which prevents it from turning properly. Moreover, this code can also indicate a defective motor or wiring issue. This is a critical problem, as when the fault arises with the fan, your boiler will not be able to release harmful gases outside the flue.

Safety Measures:

To rectify this problem, an experienced technician should inspect the fan blades for any damage or wear and tear to determine whether to repair or replace the component. In addition, they may carry out a full diagnostic check on the entire system to ensure no underlying problems are contributing to the fault code A41 error message. It’s crucial to promptly address any alleged defects in your Ariston boiler’s essential components to avoid further malfunctions and increase its longevity—always seek consultation with a professional heating engineer before attempting any repairs yourself.

4. Ariston Boiler Error Code 501: No Pilot Light

The “No Pilot Light” fault code 501 on an Ariston boiler indicates that the pilot light has failed to ignite, preventing the boiler from providing heating or hot water. This can be caused by various issues, including a faulty thermocouple, a blocked flue or air intake, or a malfunctioning gas valve.

Safety Measure:

Professional troubleshooting will need to be carried out to determine the root cause of the issue and make the necessary repairs. Ensuring that only trained professionals work on gas boilers is essential, as they can be hazardous if not handled correctly. Regular maintenance and servicing of Ariston boilers can help prevent faults such as no pilot light, ensuring your system remains safe and efficient.

5. Ariston Boiler Error Code E43: Air Pressure Switch Fault

The Ariston boiler’s faulty pressure switch (fault code E43) is a common issue homeowners and heating engineers encounter. This fault typically occurs when the air pressure switch, which is responsible for detecting whether there is adequate combustion airflow, becomes stuck or fails to operate as intended. As a result, the boiler will shut down and display the E43 error code on the digital display panel.

Safety Measures:

Addressing this problem requires knowledge and skills, including understanding boiler components and wiring diagrams. In many cases, replacement of the air pressure switch may be necessary. Otherwise, cleaning dirt or debris from impacted areas can remedy minor faults, while ensuring that the device performs safely is fundamental to safeguarding against any compromised system operation.

6. Ariston Boiler Error Code 103-108: Insufficient Water Circulation

The Ariston boiler error codes are 103-108. Insufficient water circulation typically indicates a problem with the pump or limescale buildup in the system. This can cause reduced water flow through the boiler, leading to overheating and dangerous situations for your family. The codes that will be displayed on your screen indicating insufficient water circulation are the following:

  • 103
  • 104
  • 105
  • 106
  • 107

These codes could be related to central heating pump problems, blockages in the central heating system, incorrect speed settings, or airlocks in the central heating pump.

Safety Measures:

To deal with insufficient circulation, contacting a gas-safety engineer is crucial. Let him inspect the system for signs of limescale accumulation and flush it out properly if needed. Regular maintenance from your side is crucial in preventing this error, as this issue arises due to a lack of attention during idle periods. Each homeowner must learn about their Ariston boiler, its needs for service, and periodic checks of its functionality to avoid such domestic hazards from happening or damaging their systems altogether.

7. Ariston Boiler Error Codes: SP1-SP3 or 5P1-5P3: Ignition Fault

The Ariston boiler error code 5P1–5P3 indicates an ignition fault in the heating system. This error message occurs when the boiler fails to ignite or sustain a flame long enough to heat the water. There could be several reasons behind this fault, which include faulty components such as the spark electrode, ignition lead, or control circuit board. The boiler’s gas valve may also malfunction, obstructing the flow of gas to the burner and causing ignition failure.

Safety Measures:

To rectify the ignition fault, it is recommended that a qualified heating engineer be called upon to diagnose and fix any underlying issues with the system’s components. Regular maintenance of your Ariston boiler can help prevent error codes from occurring and ensure optimal performance in future use.

Conclusion

This article provides a comprehensive list of Ariston boiler faults and error codes and a detailed discussion of the top seven error codes. We aim to help you identify any issues with your boiler and take the necessary steps to resolve them.

If, however, your boiler is beyond repair due to its age and you are looking for a boiler replacement, we are here to assist you in finding the perfect replacement that meets your specific requirements. Don’t hesitate to contact us for support.

Get a new boiler
today!

Get your new boiler and save your heating bill yearly with new energy efficient boiler.

Get a Quote Now

TrustPilot Widget

 

The information provided in this article has been collected from various sources. However, we suggest you consult a certified Gas-Safe Engineer in your area before making any decisions, as every individual’s home situation is unique.

Posted by: Martin Astley 14 July 2023