50/70 Low

Grant 50/70 Fault Code

Also written as 5070 — same fault.

The Grant 50/70 fault code means: your boiler is displaying a specific configuration code rather than a fault, indicating it has been set to run at a specific power level.. It appears on 1 Grant model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Model and Heat Output (kW/Btu/h) - 15.1 (51 500) / 18.1 (61 750) / 20.7 (70 600)

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 50/70 fault code

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

Source

Grant 50/70 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