Medium
H.02 – .03 on Baxi Suprima 50

Your boiler's computer brain is momentarily confused by its internal setup and needs to be refreshed or reconfigured.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description

Temporary error- incorrect configuration settings C1/C2.

DIY fix possible

Press the 'Reset' button on the front control panel for at least 5 seconds.Switch the electricity supply to the boiler off at the fused spur switch, wait 30 seconds, and switch it back on.If the code persists after three reset attempts, call a Gas Safe engineer to check the PCB settings.

Find a Gas Safe engineer
Search the official register →

Related guides you might find useful

Boiler won't turn on — 9-step checklist

Work through these before the call-out.

Read →

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 →