0 Low

Pro 0 Fault Code

The Pro 0 fault code means: your boiler is working perfectly and is currently sitting in sleep mode because your heating and hot water are already at the desired temperature.. It appears on 1 Pro 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: Standby - no demand for heat.
Typical repair cost £0 (including labour)

DIY fix possible

Turn up your room thermostat to see if the boiler fires upTurn on a hot water tap to trigger a demandCheck that your heating programmer or timer is set to 'On'

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Boiler cover options

Avoid the next call-out bill

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Pro models that show the 0 fault code

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

Source

Pro 0 fault code information on this page is sourced and cross-checked against the official Pro service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026