BoilerFaultCodesIdeal E06 Fault Code
The Ideal E06 fault code means: your boiler is having trouble measuring the temperature of your hot water, which usually means it cannot provide consistent heat to your taps.. It appears on 6 Ideal models in our database.
Technical description: DHW thermistor error
What causes the Ideal E06 fault?
This fault occurs when the sensor responsible for monitoring the temperature of your hot water fails or sends an incorrect signal to the boiler's control board. The most common reason is that the internal components of the sensor have degraded over time or developed a lime scale coating, preventing it from reading the heat accurately. In some cases, the error is caused by loose or corroded electrical connections between the sensor and the main unit.
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 E06 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal E06 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