S.58
FAULT CODE
Vaillant
Noise Reduction Mode Active
Low Severity
DIY Check Possible
Status code: The boiler's modulation is being limited to reduce noise. This may occur due to wind effects on the flue or at certain operating conditions.
Cold Weather Note
S.58 can be more common in windy weather when the flue terminal is exposed.
Step-by-Step Fix Guide
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Step 1
No action required — the boiler is operating at reduced output to minimise noise
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Step 2
If persistent, a Gas Safe engineer should check the flue terminal for wind effects
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.