BoilerBuddy · Ariston guide
Ariston boiler fault codes and symptoms
BoilerBuddy helps you diagnose boiler problems, work through minor checks, and escalate major problems to a Gas Safe engineer. Start with the exact code and range shown on your appliance; meanings can differ between models.
From the fault-code directory
Common Ariston codes and symptoms
These examples link to existing records for their specific boiler ranges. Open the matching record for its full context and guidance.
Clas ONE
Code 108: 108
108 indicates insufficient water pressure.
Clas ONE
Code 501: 501
501 indicates that no flame was detected.
Clas ONE
Code 103: 103
Insufficient circulation.
Clas ONE
Code 205: 205
DHW inlet probe open circuit (solar temperature probe).