Ideal · Logic Combi ESP1
F5
Logic Combi ESP1 — models 24 / 30 / 35
What F5 means
Return thermistor.
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.
Safe check: Restart the appliance once using the normal controls.
Gas Safe registered engineer: If the message remains or returns after one restart, contact Ideal or arrange a Gas Safe registered engineer.
Official source: Ideal Logic Combi ESP1 User Guide · UIN 222353 A04 (03/2023) · §8 Fault Codes, code F5, p. 8