BoilerFaultCodesGrant PP7 Fault Code
The Grant PP7 fault code means: your boiler has detected very cold temperatures and is automatically running to prevent the internal pipes from freezing.. It appears on 2 Grant models in our database.
Technical description: Winter anti-freeze protection in operation
What causes the Grant PP7 fault?
This code appears when the boiler's internal sensor detects that the water temperature has dropped below a safe threshold, typically around 8°C. To protect itself from frost damage, the boiler automatically fires the burner or runs the pump to circulate warm water until the temperature rises. This is a normal safety feature rather than a breakdown of any specific part.
This status code is most common during the winter months when outdoor temperatures drop low enough to affect the water held within the boiler casing.
DIY fix possible
No action is required as this is a normal safety function.Ensure the condensate pipe outside is not frozen or blocked.Check that your oil supply is sufficient to allow the boiler to run its cycle.
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Gas Safe Register →Grant models that show the PP7 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Grant PP7 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 27 April 2026