BoilerBuddy · Ferroli guide

Ferroli 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 Ferroli codes and symptoms

These examples link to existing records for their specific boiler ranges. Open the matching record for its full context and guidance.

  • Optimax 25 S

    Code F1: F1

    The manual groups F1 with F3 and F8: no communication between the electronic unit and gas valve.

  • Optimax 25 S

    Code F2: F2

    Flame detected while the burner is off.

  • Optimax 25 S

    Code F3: F3

    The manual groups F1 with F3 and F8: no communication between the electronic unit and gas valve.

  • Optimax 25 S

    Code F5: F5

    Fan problem.