F41
FAULT CODE
Ferroli
Maximum Delta-T Protection Activated
High Severity
Engineer Required
On Ferroli Bluehelix Tech boilers, F41 indicates the maximum allowable temperature difference between flow and return has been exceeded, triggering protection.
Step-by-Step Fix Guide
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Step 1
Check for closed isolation valves or radiator valves
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Step 2
Bleed all radiators
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Step 3 Engineer only
If fault persists, call a Gas Safe engineer — this may indicate a pump failure or system sludge
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.