• home
  • Blog
  • Troubleshooting Ariston Boiler Error Codes | Expert Solutions & Fixes

Updated: November 20, 2024

Ariston, a division of the Ariston Thermo Group, boasts a rich history spanning over 90 years. Established by Italian industrial pioneer Aristide Merloni, the brand prides itself on being global leaders in heating comfort and energy efficiency. Nonetheless, like any appliance, Ariston boilers may encounter issues and breakdowns over time. In this blog, we’ll delve into Ariston Boiler Error and Fault Codes to help you troubleshoot and resolve any issues you may encounter

Ariston, a prominent member of the Ariston Thermo Group, boasts a legacy of over 90 years in the industry. Founded by Italian industrial pioneer Aristide Merloni, the brand has positioned itself as a global leader in heating comfort and energy efficiency. Despite its reputation, like any appliance, Ariston boilers are susceptible to encountering issues and breakdowns over time. In this blog, we’ll delve into Ariston Boiler Error and Fault Codes to aid in troubleshooting and resolving potential issues.

Ariston offers a diverse range of combi, system, and regular boilers to cater to various heating needs. Their combi boilers boast a power output ranging from 24 to 38kW, suitable for both small flats and large houses, depending on the chosen power output. System boilers, on the other hand, feature a power output between 18 and 30kW. Lastly, their regular boilers are available in 24kW models.

The error codes provided in this blog aim to assist you in identifying any problems you may encounter with your Ariston boiler, facilitating easier troubleshooting and potential fixes. However, if the issue is internal or complex, we highly recommend contacting a Gas Safe Engineer for professional assistance and resolution.

What are boiler fault codes?

Boiler fault codes serve as alphanumeric or numeric indicators presented on a boiler’s control panel. They are designed to communicate specific issues or malfunctions within the heating system. These codes play a crucial role in aiding both homeowners and service technicians in promptly identifying and diagnosing problems, thus facilitating efficient troubleshooting and repairs. Each code corresponds to a particular fault or condition, providing users with valuable insight into the nature of the issue without requiring them to open the boiler or delve into intricate technical details.

Why Ariston Boiler Error Codes Matter

Imagine your boiler is like your car it might hum along smoothly most of the time, but when it coughs up a warning light, you know it’s time to pay attention. Error codes are your boiler’s way of shouting, “Help me!” Ignoring them? Well, that’s like ignoring your gas tank hitting empty not a good idea.

Read about: Combi boilers common faults  

Potterton Boiler Error Codes / Fault Codes

Ariston Boiler Error and Fault Codes Central Heating Circuit Issues

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

Hot Water Circuit Issues Ariston Boiler Error Codes

Error CodeModelPossible Cause
Hot Water Circuit Issues
202Clas HE evo Clas he evo system E-combi evo E-system evo2 bottom storage temperature probe open/short circuit
204Clas HE evo Clas he evo system E-combi evo E-system evoSolar collector temperature probe open/short circuit
205E-combi one E-System one Clas Net one Combi Clas one CombiDomestic hot water in probe open circuit
207Clas HE evo Clas he evo system E-combi evo E-system evoSolar collector overheating
208Clas HE evo Clas he evo system E-combi evo E-system evoCollector frost protection temperature

Internal Printed Circuit Board (PCB) Issues Error Codes

Error CodeModelPossible Cause
Internal Printed Circuit Board (PCB) Issues
301All BoilersEEPROM error
302All BoilersCommunication error
303All BoilersMain printed circuit board (PCB) error
304All BoilersToo many resets (> 5) in 15 minutes
305All BoilersMain printed circuit board (PCB) error
306All BoilersMain printed circuit board (PCB) error
307All BoilersMain printed circuit board (PCB) error
3p9E-combi one E-System one Clas Net one Combi Clas one Combi Clas System oneSchedule service
External Printed Circuit Board (PCB) Issues
407Clas HE evo Clas he evo system E-combi evo E-system evo7 Room sensor circuit open/short circuit

Ignition & Detection Issues Error Codes

Error CodeModelPossible Cause
Ignition & Detection Issues
501All BoilersNo flame detected
502All BoilersFlame detected with gas valve closed
504All BoilersFlame lift
5p1All Boilers1st ignition failed
5p3All Boilers2nd ignition failed
5p4All BoilersFlame cut-off

Air Inlet / Flue / Gas Outlet Issues error codes

Error CodeModelPossible Cause
Air Inlet / Flue / Gas Outlet Issues
604CLAS HE R E-Combi Evo E-System EVO Clas HE evo Combi Clas HE evo SystemInsufficient fan speed
610All BoilersThermofuse open
612Clas HE Evo Combi Clas He Evo System E-Combi Evo E-system Evo Clas net one combi Clas one combi Clas system oneFan speed has incorrect measurement

Multi-Zone Heating Issues error codes

Error CodeModelPossible Cause
Multi-Zone Heating Issues
701E-Combi Evo E-System EVO Clas HE evo combi Clas he evo systemZone 2 outgoing sensor defective
702E-Combi Evo E-System EVO Clas HE evo combi Clas he evo systemZone 2 return sensor defective
703E-Combi Evo E-System EVO Clas HE evo combi Clas he evo systemZone 3 outgoing sensor defective
704E-Combi Evo E-System EVO Clas HE evo combi Clas he evo systemZone 3 return sensor defective
705E-Combi Evo E-System EVO Clas HE evo combi Clas he evo systemHydraulic separation sensor defective
706E-Combi Evo E-System EVO Clas HE evo combi Clas he evo systemZone 2 overheating
707E-Combi Evo E-System EVO Clas HE evo combi Clas he evo systemZone 3 overheating

In certain situations, replacing your old boiler with a new one may prove to be more cost-effective than repairing it. Some issues can incur high repair costs, making investing in a new boiler a practical choice. Moreover, newer boilers tend to be more energy-efficient, offering potential savings on both energy consumption and utility bills. Therefore, purchasing a new boiler is often considered a wise long-term investment.

For a quote on a new boiler, consider reaching out to Let’s Heat. Our extensive range of products coupled with the expertise of our Gas Safe engineers ensures professional and reliable service. We’re dedicated to helping you find the perfect boiler to suit your home and heating requirements, ensuring optimal comfort and efficiency.

How to Troubleshoot Basic Ariston Boiler Issues

Checking Water Pressure
Low pressure? It’s like trying to drink through a pinched straw. Check the gauge on your boiler and top up the pressure using the filling loop if necessary.

Resetting Your Boiler
Sometimes, all your boiler needs is a quick reset. Turn it off, wait a minute, and turn it back on. If the error persists, move on to other troubleshooting steps.

Inspecting the Thermostat
A faulty thermostat can mess with your boiler’s performance. Make sure it’s set to the desired temperature and hasn’t run out of battery.

Tips for Preventing Ariston Boiler Issues

Schedule Regular Servicing
A stitch in time saves nine. Get your boiler serviced annually to keep it running smoothly.

Monitor Boiler Performance
Stay alert for unusual noises, fluctuating temperatures, or error codes. The sooner you catch an issue, the easier (and cheaper) it is to fix.

Use Manufacturer-Approved Parts
When replacing parts, stick to those recommended by Ariston. Generic parts may save you a buck now but could cost you more in the long run.

Read about:

Intergas Boiler Error Codes / Fault Codes

Biasi Boiler Error Codes / Fault Codes 

Zanussi Boiler Error Codes & Fault Codes

Why choose letsheat?

Punctuality:

At LetsHeat, we prioritize simplicity and quality in our work. Utilizing state-of-the-art management systems, we efficiently schedule jobs, confirm appointments, send reminders, and handle billing. With next-day installations and emergency services available, we’re quick to respond to your call and ensure prompt service.

Customer Care:

Building strong relationships with our customers is our top priority. We take the time to thoroughly understand your heating requirements and strive to minimize disruption to your home while working.

Experienced Staff

: Our extensive experience in the heating industry has enabled us to expand our services nationwide. We’re deeply committed to our work, and our engineers are not only highly skilled but also helpful and informative. From boiler installation, maintenance, and repair to service plans, we cover all aspects. We work with various boiler types,

including heat only, system, and combi boilers, and offer installation of heat pumps and central heating systems. Additionally, we provide comprehensive plumbing services and much more. Choose LetsHeat for reliable, professional heating and plumbing solutions tailored to your needs.

Alpha Boiler Fault Codes / Error Codes List

Combi boilers common faults  

Regular Boilers and how does it works

Ravenheat Boilers Error Codes / Fault Codes List

FAQs

Why is my Ariston boiler heating not working?

There are various reasons why your Ariston boiler might fail to ignite. These can include:
faulty ignition leads
blocked burner
broken diaphragms or airlocks
problem with the spark generator
low gas pressure
no or little gas supply
debris in the pilot jet

How to fix ignition failure on an Ariston boiler

Before contacting a heating engineer, you first can check the boiler pressure to see whether it isn’t too low or too high. Otherwise, having a Gas Safe engineer take a loot at it is the best course of action.

How to fix an Ariston faulty fan?

First of all, you should never attempt to fix the issue yourself. This is a problem that requires the expertise of a Gas Safe engineer. The heating engineer would first check that the fan is getting the needed power, by looking at the voltmeter. If it is, then it’s very likely that a replacement fan will need to be fitted.

What does error 108 on my Ariston boiler mean?

Error 108 signals low water pressure. You can fix this by topping up the system using the filling loop.

How do I reset my Ariston boiler?

Turn it off, wait about a minute, and turn it back on. If the issue persists, consult the error code for further guidance.

What should I do if my boiler shows error 304?

Check the flue pipe for blockages and ensure the fan is operational. If needed, call a technician.

Can I fix Ariston boiler error 501 myself?

You can check the gas supply and clean the burner, but if the issue continues, it’s best to get professional help.

How often should I service my Ariston boiler?

An annual service is recommended to keep your boiler in tip-top shape and prevent potential problems.

Read more about:

Vokèra Boiler Fault Codes / Error Codes List

Ravenheat Boilers Error Codes / Fault Codes List

Ferroli Boiler Error Codes / Fault codes List