F19
FAULT CODE
Saunier Duval
CH Thermistor Disconnected
Medium Severity
Engineer Required
The central heating temperature thermistor appears to have become unplugged or disconnected.
Step-by-Step Fix Guide
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Step 1
Check the thermistor cable connections
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Step 2 Engineer only
Call a Gas Safe engineer if the connection appears secure but fault persists
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.