F.32 High

Glow-worm F.32 Fault Code

Also written as F32 — same fault.

The Glow-worm F.32 fault code means: your boiler is struggling to manage its internal temperature because the fan is spinning at the wrong speed, likely due to extreme cold or a mechanical issue.. It appears on 6 Glow-worm models in our database.

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.

Technical description: Fan frost protection function active – fan speed outside the tolerance values

What causes the Glow-worm F.32 fault?

This fault occurs when the boiler's control system detects that the fan is not spinning at the required speed to safely clear exhaust gases. It is often triggered when the fan is physically stuck due to debris or ice, or when the electrical signals between the fan and the main control board are interrupted.

This fault is frequently seen during periods of extreme cold, as the frost protection mode can struggle if the air intake or flue becomes blocked by ice or snow.

Typical repair cost £180-350 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Glow-worm models that show the F.32 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Glow-worm F.32 fault code information on this page is sourced and cross-checked against the official Glow-worm service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026