BoilerFaultCodesIdeal ERROR CODE 7 Fault Code
Also written as ERRORCODE7 — same fault.
The Ideal ERROR CODE 7 fault code means: your boiler has shut down because it has detected that the exhaust gases are becoming dangerously hot, which usually suggests a serious internal blockage or a lack of water circulation.. It appears on 2 Ideal models in our database.
Technical description: FLUE OVERHEAT
What causes the Ideal ERROR CODE 7 fault?
This fault occurs when the internal sensors detect that the exhaust gases are reaching unsafe temperatures, triggering an emergency shutdown to protect the appliance. The most common reason is a lack of water flowing through the heat exchanger to carry the heat away, often caused by a failed pump or a significant internal blockage. In some cases, it can also be triggered by a heavy buildup of limescale or debris within the main heat exchanger itself.
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 ERROR CODE 7 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal ERROR CODE 7 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