Medium
262 on Worcester Bosch Greenstar 2000

Your boiler's computer system has encountered a software glitch and needs to be restarted to clear the error.

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.

What the manual says

Manufacturer manual

Internal OS error

From this model's manual
Verified against the Worcester Bosch Greenstar 27cdi installation & service manual, page 81.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Locate your boiler's power supply switch or plug.Switch it off and wait for 60 seconds to allow the internal memory to clear.Switch the power back on and see if the error clears itself.

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