200 O Low

Worcester Bosch 200 O Fault Code

Also written as 200O — same fault.

The Worcester Bosch 200 O fault code means: your boiler is working normally and is currently heating up your radiators.. It appears on 10 Worcester Bosch models 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: Boiler in heating mode

What causes the Worcester Bosch 200 O fault?

This is a normal operational status and not a mechanical fault or failure. It appears when your thermostat or programmer has requested warmth, signaling the boiler to ignite the burner and circulate hot water to your radiators. You may see this code frequently during colder periods as the system works to maintain your target indoor temperature.

You will see this code more regularly during the autumn and winter months when your central heating is scheduled to be active.

DIY fix possible

This fault may be fixable without an engineer. Check your manual first.

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Worcester Bosch models that show the 200 O fault code

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

Source

Worcester Bosch 200 O 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