F20
FAULT CODE
Saunier Duval
Software Incompatibility
Medium Severity
Engineer Required
The user interface or main board has incorrect or incompatible software.
Step-by-Step Fix Guide
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Step 1
This usually only occurs after PCB or display replacement
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Step 2 Engineer only
The engineer who replaced the component needs to ensure compatible software versions
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.