1023 R Low

Worcester Bosch 1023 R Fault Code

Also written as 1023R — same fault.

The Worcester Bosch 1023 R fault code means: your boiler has been running for a very long period without a break and has temporarily paused itself for safety and maintenance reasons.. It appears on 1 Worcester Bosch model in our database.

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: Maximum run time including standby time reached
Typical repair cost £0-80 (including labour)

DIY fix possible

Press the Reset button on the boiler control panelSwitch the boiler power off at the wall socket, wait 30 seconds, and switch it back onCheck that your thermostat is not set to a temperature much higher than needed

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Worcester Bosch models that show the 1023 R fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch 1023 R fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026