F39
FAULT CODE
Ferroli
External Temperature Probe Fault
Low Severity
Engineer Required
The optional external temperature probe (for weather compensation) has a wiring fault or has been disconnected after weather compensation mode was activated.
Step-by-Step Fix Guide
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Step 1
Check the external sensor cable for damage
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Step 2 Engineer only
If weather compensation is not being used, an engineer can disable this function in the boiler settings
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.