BoilerFaultCodesIdeal F15 Fault Code
The Ideal F15 fault code means: your boiler has stopped working because the internal pump that moves hot water around your pipes has developed an electrical fault or has failed.. It appears on 3 Ideal models in our database.
Technical description: Pump Fault: Check pump wiring, if OK replace pump
What causes the Ideal F15 fault?
This fault occurs when the boiler's main internal unit detects that the pump is no longer spinning or has an electrical connection failure. The most common reason is that the motor inside the pump has burnt out or become seized after years of pushing water through the system. In some cases, it can also be caused by a loose wiring connection or a leak dripping onto the pump's electrical terminals.
This issue is frequently seen at the start of autumn when a pump that has been idle all summer is suddenly asked to work and fails to restart.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Ideal models that show the F15 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal F15 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