Ideal Heating · Logic Code Combi ESP1
F2 / Fn / LnFlame loss
This code applies to Logic Code Combi ESP1 26, Logic Code Combi ESP1 33, Logic Code Combi ESP1 38. Fault codes narrow down the likely problem, but they do not replace a model-specific diagnosis.
What you can safely check
- Check whether another gas appliance works and whether a prepayment meter has credit.
- In freezing weather, visually check an accessible external condensate pipe for ice and follow the manufacturer's thawing guidance if applicable.
- Reset once only if the user manual permits it. If the code returns, arrange an engineer.
How an engineer may fix it
Test the gas supply and inlet pressure, ignition and ionisation components, condensate route, flue, gas valve and combustion settings; repair or replace the failed component.
Manufacturer source: Ideal Heating — Logic Code Combi ESP1 Installation & Servicing (UIN 222364 A04). Checked 15 August 2026. The appliance manual and an engineer’s on-site diagnosis take precedence. Never remove the boiler case yourself.