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Ariston Boiler Error Codes [2021 Updated]

With over 50 years of experience, it’s no wonder that Ariston boilers have stood the test of time as they provide high-quality and efficient boiler options.

However, when you do run into a problem, being able to understand and interpret your Ariston boiler error codes can be surprisingly handy. It allows you to quickly identify the magnitude of the problem and how urgently you need to seek assistance.

As with any issue when it comes to your boiler, it is always advised to reach out to a gas safe engineer who will know how to safely resolve the problem at hand. Whilst the language of error codes may seem a little unusual, for those that are trained, it quickly isolates and identifies the problem area.

In this article, we are going to outline the main Ariston boiler error codes, in addition to this, we identify how to reset your Ariston boiler, offer preventative maintenance advice, and let you know how to find a gas safe engineer in your area. So let’s dive in!

What are Ariston boiler error codes?

Ariston boiler error codes are the numerical and occasionally alphanumerical codes displayed on your boiler when there is an issue. This code usually identifies the fault so that you can pinpoint the cause of the problem.

Ariston boiler error codes are predominantly used by professional gas safe engineers to identify the problem with the boiler so that they can resolve it. However, it is always beneficial to understand these error codes yourself.

How to reset an Ariston boiler

To reset your Ariston boiler you simply need to locate the reset button and hold it down for up to 10 seconds. All boilers will have a reset button, however, depending on the make and model, its location might look slightly different. If you can’t automatically see the reset button then check in the menu on the display screen of the boiler. As always, remember to check your specific Ariston boiler manual for more information and the specific location for your Ariston model.

All modern boilers have a safety feature that will force the boiler to lockout when a problem occurs. When the boiler recognises an error it will automatically stop working, this not only protects the boiler itself from potential further damage but also notifies you that something isn’t quite right.

There are several reasons why you might need to reset your boiler. After a problem has been resolved you often need to reset your boiler so that the error is cleared and the system can be refreshed to start back up again. Any error codes or flashing lights displayed will stop at this point.

Sometimes simply resetting your boiler can resolve the problem in the first place. If advised to do so by your gas safe engineer, you can reset your Ariston boiler yourself which might save you time and money if the engineer doesn’t need to make a home visit.

If you need to consistently reset your Ariston boiler, it could be an ongoing fault in the system. If this is the case then it is worth checking with your gas safe engineer to see if there are any faults that could lead to serious hazards. This might also be a sign to consider upgrading your boiler.

Ariston boiler maintenance

It is important to conduct an annual maintenance check on your Ariston boiler. Not only will this ensure a long life for your boiler but it can also prevent some potentially large future costs.

An annual maintenance check can ensure that your boiler is operating safely. It is an opportunity to identify any small problems that can be easily repaired or replaced, but that could have turned into a much bigger and costly problem.

Ensuring that your boiler is performing optimally will help to keep your heating bills to a minimum. An efficient boiler will take less fuel which results in cheaper bills and lower carbon emissions. If you think that your boiler is not running efficiently and is on its’ last legs, then reach out to our expert advice team today to help find an optimal boiler alternative.

Ariston boilers usually include a manufacturer’s warranty which lasts between 2-12 years and means that any faults can be repaired or replaced for free.

Remember to have your annual maintenance check carried out by a gas safe registered engineer so that you can feel confident that it has been completed to a high standard.

How to find a gas safe engineer

We have identified the importance of using a gas safe engineer for any breakdown or maintenance work on your boiler. They are fully trained and equipped to work with this equipment and understand how to handle gas-based devices.

You can identify whether or not an engineer is gas safe by checking if they are on the gas safe register and if they have their gas safe ID. In the UK we have an official list of engineers who are registered. Simply search your postcode to find a suitable gas safe registered engineer near you.

Ariston boiler error codes

If your boiler has suddenly displayed an error code, then use the below guide to help identify the possible cause. To jump straight to a specific issue, then please use the list below.

  • Central heating circuit error codes
  • Hot water circuit error codes
  • Internal printed circuit board error codes
  • External printed circuit board error code
  • Ignition & Detection Issue error codes
  • Air inlet / flue/ gas outlet error codes
  • Clas Net One, Clas One, E-Combi and E-System error codes

Central heating circuit error codes

Fault CodeBoiler ModelPossible Cause
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 one
System pressure greater than 3 bar
110All BoilersCentral heating flow temperature probe circuit open / short circuit
112All BoilersCentral heating return 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 one
Insufficient circulation indication

Hot water circuit error codes

Fault CodeBoiler ModelPossible Cause
202Clas HE evo
Clas he evo system
E-combi evo
E-system evo
2 bottom storage temperature probe open/short circuit
204Clas HE evo
Clas he evo system
E-combi evo
E-system evo
Solar collector temperature probe open/short circuit
205E-combi one
E-System one
Clas Net one Combi
Clas one Combi
Domestic hot water in probe open circuit
207Clas HE evo
Clas he evo system
E-combi evo¨C16CE-system evo
Solar collector overheating
208Clas HE evo¨C17CClas he evo system¨C18CE-combi evo¨C19CE-system evoCollector frost protection temperature

Internal printed circuit board error codes

Fault CodeBoiler ModelPossible Cause
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 one
Schedule service

External printed circuit board error code

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

Ignition & Detection Issue error codes

Fault CodeBoiler ModelPossible Cause
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 error codes

Fault CodeBoiler ModelPossible Cause
604CLAS HE R
E-Combi Evo
E-System EVO
Clas HE evo Combi
Clas HE evo System
Insufficient 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 one
Fan speed has incorrect measurement

Clas Net One, Clas One, E-Combi and E-System error codes

External printed circuit board error codes

Fault CodesPossible Cause
411Room sensor circuit open or short circuit zone 1
412Room sensor circuit open or short circuit zone 2
414Room sensor circuit open or short circuit zone 3

Multi-zone heating error codes

Fault CodesPossible Cause
701Send sensor defective (Zone 1)
702Send sensor defective (Zone 2)
703Send sensor defective (Zone 3)
711Return sensor defective (zone 1)
712Return sensor defective (zone 2)
713Return sensor defective (zone 3)
722Overheating in zone 2
723Overheating in zone 3
750All heating zones locked

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