Toggle on/off Low

Worcester Bosch Toggle on/off Fault Code

Also written as TOGGLEONOFF — same fault.

The Worcester Bosch Toggle on/off fault code means: your boiler is simply flashing because the reset button was tapped, and it is waiting for a moment to restart its normal cycle.. 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: Reset button pressed by mistake.

DIY fix possible

Wait 30 seconds for the boiler to complete its internal checkIf the light continues to flash, press and hold the reset button for five secondsWait for the display to return to a steady temperature reading

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Worcester Bosch models that show the Toggle on/off fault code

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

Source

Worcester Bosch Toggle on/off 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