No burner ignition
Ferroli Optimax HE 38 C Fault codes & diagnostics
20 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Severity at a glance
Each cell = one fault code. Hover to identify.All 20 documented codes
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Flame detected with the burner off
High limit protection
Flue gas fault
Fan problem
No flame after the ignition phase (6 times in 4 min.)
Flow sensor disconnected
Flue gas fault
Flow sensor fault
Return sensor fault
Flue sensor fault
Flow sensor fault
Fan problem
Supply voltage under 180V. - Electric supply problem
Irregular mains frequency - Electric supply problem
Incorrect system water pressure - Pressure too low / Sensor damaged
External probe fault - Sensor damaged or short-circuited
Incorrect system water pressure - Pressure too high above 3 - 5 bar
Flow sensor fault - Sensor damaged
N/A for UK market - Wiring interrupted / Sensor damaged