F21
FAULT CODE
Ferroli
Outdoor Sensor Fault
Low Severity
Engineer Required
The outdoor sensor is faulty or disconnected.
Step-by-Step Fix Guide
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Step 1
Check cable
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Step 2 Engineer only
An engineer can replace the sensor
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.