Low
PP7 on Grant Vortex Blue

Your boiler has detected very cold temperatures and has automatically turned on its built-in safety mode to prevent the internal pipes from freezing.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

Winter anti-freeze protection in operation

DIY fix possible

Wait for the cycle to complete naturally as the boiler warms itself upEnsure any external condensate pipes are properly insulated or 'lagged'Check that the room thermostat is set to a reasonable minimum temperature

Find a Gas Safe engineer
Search the official register →

Related fault codes

PP1View →PP2View →

Related guides you might find useful

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →