How much does it cost to fix Ideal error code 0 or -. / H?

Typical repair cost for the Ideal 0 or -. / H fault is £120-250 including labour.

0 or -. / H Medium

Ideal 0 or -. / H Fault Code

Q: What does the Ideal 0 or -. / H fault code mean?

Your boiler is working fine to heat your radiators, but it isn't heating your hot water tank as it should.

Also written as 0ORH — same fault.

The Ideal 0 or -. / H fault code means: your boiler is working fine to heat your radiators, but it isn't heating your hot water tank as it should.. It appears on 1 Ideal model in our database.

Technical description: The central heating installation is correctly heated, but the hot water tank (if present) is not.

Typical repair cost £120-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Ideal models that show the 0 or -. / H fault code

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

Maximiser SE Repair: £120-250

Source

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

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026