If your Ariston boiler is showing SP1 on the screen, you might think it’s an error. In fact, it’s not a fault code, but a notification that often gets misunderstood due to how it’s displayed. The correct code is actually 5P1, and this article will explain what it means, how to interpret it, and what actions to take.
What Does 5P1 (SP1) Mean?
The 5P1 notification indicates that the boiler has failed to ignite on the first attempt. This notification is part of a normal three-step ignition process:
- 5P1: First failed ignition attempt
- 5P2: Second failed ignition attempt
- 5P3: Third failed attempt – boiler stops trying to ignite
These notifications are connected to two real error codes:
- Error 501: No flame detected during ignition
- Error 502: Flame detected when the gas valve is closed
Why Do People Confuse SP1 and 5P1?
On the digital display, the number “5” often resembles the letter “S”, which leads many users to misread 5P1 as SP1. This confusion is very common, not only in Ariston boilers, but also in models from Chaffoteaux and Elco, which are part of the same group.
SP1 and the Ignition Process
When the boiler can’t ignite, it will display 5P1, then 5P2, and finally 5P3 if ignition fails after three tries. These are notification codes, not actual errors. They indicate that the system is trying to start, but something is preventing ignition.
For example, if there’s no gas supply or the valve is closed, the boiler might show:
- Error 501
- Then 5P1 → 5P2 → 5P3
- Until it stops and locks
In this case, you’ll need to resolve the issue and reset the boiler manually.
Other Brands with Similar Confusions
This type of display confusion isn’t exclusive to Ariston. Users of other brands in the same group often experience the same issue:
- Chaffoteaux: Users misread 5P1 as SP1
- Elco: Similar notification systems that cause the same confusion
All these brands use similar software and display logic due to belonging to the Ariston Thermo Group.
How to Fix 5P1 Notification on an Ariston Boiler
- Reset the boiler:
Press and hold the reset button for a few seconds. - Check the gas supply:
Make sure the gas valve is open and the supply is not interrupted. - Purge the gas line:
If air entered the line, it could block ignition. You may need a technician to bleed the system. - Call a professional:
If the problem persists, contact a certified technician to inspect the ignition system, sensor, or gas valve.
Access All Ariston Replacement Parts Available at Suner
At Suner, we offer a wide selection of 100% original Ariston boiler parts—at prices that make the decision easy. Find the exact replacement your business needs and shop with confidence.
Click here to explore Ariston parts in your Suner store.
When searching for boiler replacement parts, keep in mind that while generic options might be cheaper, original parts deliver better performance and the highest level of reliability.
Frequently Asked Questions – Ariston 5P1 Notification
❓ Is SP1 a real error code?
No. It’s actually 5P1, a notification about failed ignition—not a technical fault.
🔁 Will the boiler restart on its own?
Not in this case. Once it shows 5P3, the unit locks and must be reset manually.
🔍 What if I see error 501 or 502?
These indicate real problems:
- 501: No flame during ignition
- 502: Flame detected while the valve is closed
These may require professional service.
🔥 Is this dangerous?
The boiler is designed to lock out for safety. However, do not attempt ignition repeatedly without fixing the root cause. Always prioritize safety and call a technician if unsure.
Need Replacement Parts for Your Ariston Boiler?
If you’re facing ignition problems or other recurring faults, replacing worn-out components may be necessary.
👉 Access all compatible Ariston boiler parts here – from ignition electrodes to gas valves and control panels.
🛠 All parts are original and guaranteed for proper operation.
Conclusion
The SP1 (5P1) notification on Ariston boilers is not an error but a sign that the ignition attempt has failed. It’s often confused due to the display, but understanding it helps avoid panic and unnecessary service calls. Check your gas supply, reset the unit, and when in doubt, call a professional.