Ariston Boiler Error Codes, Causes & How to Fix [2024 Updated]

Ariston boilers error codes and faults – What they mean & how to fix

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.

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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 combi boiler problem and how urgently you need to seek assistance and save you from an unnecessary new boiler cost.

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Fixing an Ariston boiler error

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.

How to fix common Ariston boiler problems

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! Ariston does make electric boilers too so ensure you know what boiler you have.

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 type of boiler and 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 lock out when a problem occurs. When the boiler recognises an error it will automatically stop the boiler from working, this not only protects the boiler itself from potential further damage but also notifies you that something isn’t quite right.

Why reset your Ariston boiler?

There are several reasons why you might need to reset your boiler. After a boiler 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 or a water leak from boiler. 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 and a new boiler.

An annual boiler service 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 more costly problem.

Ensuring that your boiler is performing optimally will help to keep your heating bills to a minimum, therefore, making the cost of a boiler service worth the price. 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 and warranties

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. You get boiler cover which you can pay monthly for then this will also include your yearly boiler service.

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

Ariston central heating circuit error codes

Fault Code	Boiler Model	Possible Cause
101	All Boilers	Overheat
102	E-Combi Evo E-System Evo Clas He Evo (Combi and system)	Pressure sensor error
103	All Boilers	Insufficient circulation
104	All Boilers	Insufficient circulation
105	All Boilers	Insufficient circulation
106	All Boilers	Insufficient circulation
107	All Boilers	Insufficient circulation
108	All Combi Boilers	Insufficient water (request filling)
109	Clas net one / Clas one Combi Clas system one	System pressure greater than 3 bar
110	All Boilers	Central heating flow temperature probe circuit open / short circuit
112	All Boilers	Central heating return temperature probe circuit open / short circuit
114	All Boilers	External sensor circuit open / short circuit
116	All Combi and System Boilers	Floor thermostat contact open
118	All Boilers	Heating delivery probe problem
1p1	All Boilers	Insufficient circulation indication
1p2	All Boilers	Insufficient circulation indication
1p3	All Boilers	Insufficient circulation indication
1p4	Clas Net one Combi Clas one Combi Clas System one	Insufficient circulation indication

Ariston hot water circuit error codes

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

Ariston internal printed circuit board error codes

Fault Code	Boiler Model	Possible Cause
301	All Boilers	EEPROM error
302	All Boilers	Communication error
303	All Boilers	Main printed circuit board (PCB) error
304	All Boilers	Too many resets (> 5) in 15 minutes
305	All Boilers	Main printed circuit board (PCB) error
306	All Boilers	Main printed circuit board (PCB) error
307	All Boilers	Main printed circuit board (PCB) error
3p9	E-combi one E-System one Clas Net one Combi Clas one Combi Clas System one	Schedule service

Ariston external printed circuit board error code

Fault Code	Boiler Model	Possible Cause
407	Clas HE evo Clas he evo system E-combi evo E-system evo	7 Room sensor circuit open/short circuit

Ariston gnition & detection issue error codes

Fault Code	Boiler Model	Possible Cause
501	All Boilers	No flame detected
502	All Boilers	Flame detected with gas valve closed
504	All Boilers	Flame lift
5p1	All Boilers	1st ignition failed
5p3	All Boilers	2nd ignition failed
5p4	All Boilers	Flame cut-off

Ariston air inlet / flue/ gas outlet error codes

Fault Code	Boiler Model	Possible Cause
604	CLAS HE R E-Combi Evo E-System EVO Clas HE evo Combi Clas HE evo System	Insufficient fan speed
610	All Boilers	Thermofuse open
612	Clas 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

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

External printed circuit board error codes

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

Ariston multi-zone heating error codes

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

Choosing the right boiler for reliability

When choosing a new boiler, it is always good to know what issues they have had in the past so that you can make a judgement on your next purchase. A boiler will eventually break, and if you are looking for a new Ariston boiler or something similar, then check out other boiler problems from similar manufacturers such as Firebird error codes & Ravenheat error codes.

You’ll see that the list here is very similar and these boiler manufacturers are in the lesser-known category, similar to Ariston boilers.