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 fault code page for quick meaning, safe first checks, and escalation advice.
Appliance hubs
1
Fault code pages
18
Guides linked in
3
Appliance types
Global appliance category hubs
Most searched fault codes
Most common fault families
sensor (4)
fan and flue (3)
ignition (3)
flame-loss (2)
low-pressure (2)
PCB and control (2)
Popular priority codes
F9 for Boiler
The boiler is not seeing healthy water circulation
F4 for Boiler
The boiler has failed to ignite on demand
L2 for Boiler
The boiler has lost or failed to prove flame
C5 for Boiler
Fan, flue, or air pressure sensing problem
C6 for Boiler
Fan, flue, or air pressure sensing problem
C7 for Boiler
Control board or internal communication fault
F2 for Boiler
Flame detection has been lost during operation
F3 for Boiler
Fan, flue, or air pressure sensing problem
HF for Boiler
The boiler has failed to ignite properly
L1 for Boiler
The boiler has overheated or hit a high temperature limit
L5 for Boiler
Control board or internal communication fault
L6 for Boiler
Flame detection has been lost during operation
Related guides
Practical background guides connected to this brand's fault-code pages.
Boiler Fault Codes: When to Stop and Call a Professional
Boiler issues need a more cautious approach than most white goods, especially where gas, combustion, or repeated lockouts are involved.
When to Call an Appliance Engineer
Guidance on recognising when simple checks have been exhausted and it is time to arrange a repair.
Why Your Boiler Keeps Losing Pressure
Learn the difference between a one-off pressure drop and repeated pressure loss, plus the safe top-up and recheck advice that stays within normal user controls.