BoilerFaultCodesIdeal F9 Fault Code
The Ideal F9 fault code means: your boiler's internal computer has lost its settings or suffered a technical failure and can no longer control the heating system.. It appears on 21 Ideal models in our database.
Technical description: Printed circuit board (PCB) unconfigured or fault
What causes the Ideal F9 fault?
This fault occurs when the boiler's main control board loses its identity or suffers an internal electronic failure, meaning it can no longer communicate with the rest of the components. The most common reason is a glitch in the software memory or a physical defect in the plug-in configuration chip that tells the board exactly which model of boiler it is controlling.
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.
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A cover plan would handle faults like F9: no call-out fees, no surprise bills.
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Ideal models that show the F9 fault code
Click a model for the full fault code list and model-specific repair notes.
- Atlantic Combi Repair: £250-450
- Classic Repair: £250-450
- CLASSIC2 Repair: £150-350
- ESPRIT ECO2 Repair: £100-£250
- EXCLUSIVE2 Repair: £250-450
- i Combi 2 Repair: £250-£450
- Independent Repair: £250-450
- INDEPENDENT SYSTEM Repair: £150-£350
- Independent System S15 Repair: £250-£450
- INSTINCT2 Repair: £90-180
- Logic Air Repair: £150-300
- Logic Code Combi ESP1 Repair: £100-£350
- Logic Combi C24 C30 C35 Repair: £180-450
- Logic Combi ESP1 Repair: £100-180
- LOGIC HEAT Repair: £150-350
- Logic Max Combi Repair: £100-£350
- Logic Max Heat Repair: £150-350
- Logic Max Heat 2 Repair: £250-400
- Logic Max System Repair: £100-£350
- LOGIC SYSTEM Repair: £250-£450
- Logic+ Heat H Repair: £180-450
Source
Ideal F9 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 31 August 2026