High
268 on Worcester Bosch Greenstar 1000

Your boiler has detected an internal communication glitch during its self-test phase, which prevents it from firing up safely.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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.

What the manual says

Manufacturer manual

Relay test was activated

Shared across the Greenstar 1000 range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

What causes this fault?

Test mode notification

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Related fault codes

269View →270View →

All 106 fault codes on the Greenstar 1000

Seeing a different code? Every code this model can display, in one place.

2002012022032042082132142222232242272282292322332342352372382402412452492502512522532542582592622632652692702732752832842853053063413473513533573583603623633643655226041010101310181019102110231025106810731074208529082910291529162920292329242925292629272928293029312940294629482949295029512952295529562957295829592960296129622963296429652966296729722973297429802981

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