H0

Ideal Service Reminder / Maintenance Indicator

Ideal boiler displays H0, boiler may still operate but with limited output

Possible Causes

Annual service interval reached, Timer in PCB elapsed, Boiler not reset after last service

How to Fix / Troubleshooting

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.

Repair Difficulty

Very Easy 1/5