Error code
Ideal Boiler Fault Code HF
Quick answer
HF
The boiler has failed to ignite properly
First safe action
Check whether other gas appliances appear to have lost supply, without dismantling the boiler.
Meaning
Ideal boiler fault code HF usually means the boiler could not ignite or complete its startup sequence correctly.
Likely causes
- Temporary gas supply interruption
- Ignition or electrode fault
- Control problem affecting startup
Safe first checks
- Check whether other gas appliances appear to have lost supply, without dismantling the boiler.
- If the manufacturer permits a user reset, try the standard reset process once.
- Stop further reset attempts if the fault returns.
How to reset
- Follow the reset instructions shown on the boiler control panel or in the manual.
- If the code reappears after one reset, book a qualified engineer.
When to call an engineer
If the fault returns after one reset, stop there and arrange a Gas Safe registered engineer.
Safety warning
Do not remove the boiler casing or try to work on gas, ignition, or combustion components yourself.
Useful hub links
Related fault codes
F4 for Ideal Boiler
The boiler has failed to ignite properly
F9 for Ideal Boiler
Water circulation or pump performance issue
L1 for Ideal Boiler
The boiler has overheated or hit a high temperature limit
L2 for Ideal Boiler
The boiler has failed to ignite properly
F5 for Ideal Boiler
A boiler sensor is giving an invalid reading
F6 for Ideal Boiler
A boiler sensor is giving an invalid reading
Relevant guides
Frequently asked questions
Can I keep resetting a Ideal boiler with HF?+
No. If HF returns after one standard user reset, stop there and arrange a qualified engineer if the manual gives no safe next step.
Is HF something I can repair myself?+
Boiler faults should be treated cautiously. Stay within the user checks in the manual, and leave gas, combustion, and internal boiler repairs to a qualified professional.