A3.2 High

Grant A3.2 Fault Code

Also written as A32 — same fault.

The Grant A3.2 fault code means: your boiler has detected that the water pump responsible for circulating heat around your home is not operating correctly, which prevents your heating or hot water from working.. It appears on 6 Grant 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: Pump fault diagnosis
Typical repair cost £250-450 (including labour)

Engineer required

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

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Grant models that show the A3.2 fault code

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

Source

Grant A3.2 fault code information on this page is sourced and cross-checked against the official Grant service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026