Low
r1 on Worcester Bosch ZB 7 27 HE

Your boiler is currently performing an internal reset to restore its factory service settings, which is a normal process and not an actual error.

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.

What the manual says

Manufacturer manual

Reset 1: Resetting service functions 0.0 to 4.9 to their factory settings

From this model's manual
Verified against the Worcester Bosch Greenstar 25i Zwb 7 25 installation & service manual.
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

Ensure the boiler is not currently in a service modeWait for the display to cycle through the reset sequenceIf the code persists, press the reset button once to return to normal operation

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