Ideal boiler displays H0; the boiler may still operate but with limited output.

Safety first: H0 is usually not a fault but a reminder. However, regular servicing is essential for safe operation.

User steps:

• Check the manual: Confirm that H0 on your specific Ideal model (e.g. Logic, Vogue) is a service reminder.
• Arrange a service: Contact a Gas Safe registered engineer to carry out an annual service, including combustion checks, cleaning, and safety tests.
• Reset reminder: The engineer will reset the service interval via the boiler controls after completing the service.