Ariston Boiler Error Codes

If your Ariston boiler has stopped working and is showing a fault code, the code can help narrow down what has gone wrong.

Some faults relate to water pressure or circulation, while others involve ignition, sensors or electronic components. The exact meaning can vary between Ariston models, so the code should always be checked against the manual for your particular boiler.

ReliaHeat provides boiler fault diagnosis and repairs across Edinburgh, Midlothian and East Lothian.

Call 07502183583 Request a Boiler Repair

Ariston Boiler Error Codes

If your Ariston boiler has stopped working and is showing a fault code, the code can help narrow down what has gone wrong.

ReliaHeat provides boiler fault diagnosis and repairs across Edinburgh, Midlothian and East Lothian.

Request a Boiler Repair Call 07502183583

What Do Ariston Boiler Error Codes Mean?

Ariston boilers use fault codes to indicate why the appliance has shut down or detected a problem.

The code is useful information for an engineer, but it does not always identify the failed component on its own. Several different faults can sometimes produce similar symptoms.

When contacting us, tell us the Ariston model and the exact code shown on the display. This can help us prepare for the visit.

Ariston Error Code 108 – Low Water Pressure

On current Ariston documentation, 108 indicates that the heating circuit needs filling because the water pressure is too low.

If your boiler has a pressure gauge, check the reading against the instructions for your particular model.

Some Ariston boilers allow the homeowner to restore the pressure using the filling loop. Follow the manufacturer’s instructions rather than guessing at the correct pressure.

If code 108 keeps returning, repeatedly topping the boiler up is not a permanent solution. Ariston advises contacting a qualified engineer where pressure repeatedly falls, as the system may need to be checked for water loss.

Ariston Error Codes 103–107 – Circulation Problems

Codes 103, 104, 105, 106 and 107 are associated with poor or failed circulation through the heating circuit on a number of current Ariston boilers.

There can be several possible causes, including problems with circulation, pumps, air within the system or restrictions in the heating circuit.

That does not mean these codes automatically indicate sludge or that the heating system needs a powerflush.

An engineer should diagnose the cause first. If contamination is found to be contributing to the problem, system cleaning can then be considered.

Ariston Error Codes 305–307 – PCB Faults

Ariston documentation lists 305, 306 and 307 as PCB faults on several boiler ranges.

The printed circuit board is responsible for controlling and communicating with many of the boiler’s components.

A PCB code does not mean you should immediately replace the boiler.

The appliance should first be inspected to establish whether the fault lies with the board itself, a connection or another related component.

Ariston Error Code 501 – No Flame Detected

501 is listed by Ariston as a no-flame or failed-ignition fault on current models.

If this appears, the boiler has been unable to establish or confirm a flame.

There are several possible reasons, so this isn’t something to diagnose by replacing parts yourself.

If your gas supply appears to be operating normally and the code returns after an appropriate reset, arrange for the boiler to be checked.

Can I Reset an Ariston Boiler?

Some Ariston faults can be reset from the boiler controls.

Follow the instructions in the manual for your exact model. Ariston specifically warns against repeatedly resetting a boiler when the fault keeps coming back; current manuals limit the number of resets that can be carried out within a short period.

A reset may clear an isolated shutdown, but it does not repair an underlying fault.

If the same error keeps returning, stop resetting the appliance and arrange an inspection.

Ariston boiler in a modern kitchen interior

When Should I Call a Gas Safe Engineer?

Call an engineer if the fault repeatedly returns, the boiler will not restart, pressure continues to fall, heating or hot water remains unavailable, or you are unsure what the code means.

Do not remove the boiler casing or attempt work on gas, combustion or internal electrical components yourself.

ReliaHeat can investigate the fault and explain what repair is required before further work is carried out.

Repair or Replace an Older Ariston Boiler?

A fault code by itself is not a reason to replace a boiler.

For an older appliance, however, it can be worth considering the boiler’s age, general condition, repair history, availability and cost of parts, and whether other problems are developing.

We can assess the fault first and explain the repair options.

If replacement is becoming the more sensible route, you can then compare that with the cost of a new boiler installation rather than making the decision based on an error code alone.

Ariston Boiler Repairs in Edinburgh and the Lothians

ReliaHeat investigates boiler faults across Edinburgh, Midlothian and East Lothian.

When getting in touch, send us the boiler model and the error code shown on the display where possible.

We can assess the appliance, identify the likely cause and explain the next step.

Ariston Boiler Showing an Error Code?

If your Ariston boiler has stopped working or the same fault code keeps returning, contact ReliaHeat to arrange an assessment.

Request a Boiler Repair Call 07502183583