Ideal · Logic Code Combi ESP1
F4 boiler fault code
Logic Code Combi ESP1 — models 26 / 33 / 38
Get a Gas Safe engineer
Free. Enter your postcode.
What F4 means
F4 indicates a flow thermistor fault.
Gas Safe engineer: If the message remains or returns after one restart, contact Ideal or arrange a Gas Safe registered engineer.
If you smell gas, a CO alarm sounds, anyone feels unwell, or there is an unsafe flame, leave and call 0800 111 999 from outside.
Renting? Report it to your landlord or housing provider first. They are responsible for gas safety and boiler repairs, and the repair should not cost you.
Safe check
Restart the appliance once using the normal controls.
When to contact an engineer
If the message remains or returns after one restart, contact Ideal or arrange a Gas Safe registered engineer.
Source and provenance
- Ideal Logic Code Combi ESP1 26/33/38 Installation & Servicing · UIN 222364 A04 · §4.1 Fault Finding Chart Main Menu, printed p. 56
installation and servicing instructions
10/2023 · UIN 222364 A04
- Logic Code Combi ESP1 User Guide · UIN 222364 A04 · §8 Fault Codes, printed p. 8
user guide
10/2023 · UIN 222364 A04