High
F.32 on Vaillant Ecomax Condensing 600/800 series

Your boiler's fan is failing to spin at the correct speed, which prevents it from safely venting exhaust gases and starting your heating.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

What the manual says

Manufacturer manual

Fan turning–speed malfunction (too fast at start–up), Fan unit obstructed, plug–in fan connector not correctly inserted, Hall sensor defective, fault in cable loom, defective electronic control system

From this model's manual
Verified against the Vaillant Ecomax Condensing 600 800 Series installation & service manual, page 49.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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