Brand hub
Ideal Fault Codes
Find Ideal boiler fault code explanations with conservative guidance for safe checks and lockout faults. Use this hub to move into the right appliance section, then open the exact code page for the documented meaning, evidence limits and safe next steps.
Definitions can vary by model and region. Some codes remain unconfirmed; check the complete display, exact model and the page's sources before taking action.
Appliance hubs
1
Fault code pages
18
Guides linked in
3
Appliance types
Appliance codes across brands
Selected code pages
Code categories in this library
Counts refer to published code pages, not how often an appliance develops a fault.
unconfirmed (5)
PCB and control (3)
sensor (3)
ignition (2)
fan and flue (1)
flame-loss (1)
More code pages
F9 for Boiler
PCB fault on the documented Instinct2 models
C6 for Boiler
Meaning unconfirmed; exact model documentation is required
F5 for Boiler
Return-thermistor fault in Ideal’s documented F5 guidance
C0 for Boiler
BCC activation fault
C2 for Boiler
BCC chip fault
C5 for Boiler
Meaning unconfirmed; exact model evidence required
C7 for Boiler
Meaning unconfirmed; exact model evidence required
D4 for Boiler
Meaning unconfirmed; exact model evidence required
F1 for Boiler
Low water pressure
F2 for Boiler
Flame loss or ignition fault
F3 for Boiler
Fan fault
F4 for Boiler
Flow-thermistor fault
Related guides
Practical background guides connected to this brand's fault-code pages.
Boiler Fault Codes: When to Stop and Call a Professional
First separate an emergency from a routine fault. A code needs the exact model and full display; it cannot by itself establish a safe reset or identify a part to replace.
When to Call an Appliance Engineer
Use the exact manual for permitted owner checks. Recurring faults, unsafe symptoms and work inside the appliance need appropriate professional help; emergencies need immediate action.
Why Your Boiler Keeps Losing Pressure
Use the pressure target and filling instructions for your exact boiler and installation. Repeated pressure loss needs investigation; a low reading alone does not identify a failed component.