Ideal · Logic Code Combi ESP1
FU boiler fault code
Logic Code Combi ESP1 — models 26 / 33 / 38
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What FU means
FU indicates the flow/return temperature difference is greater than 50C.
Gas Safe engineer: Contact Ideal or arrange a Gas Safe registered engineer for diagnosis.
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
No homeowner action is listed. Do not reset or adjust the boiler; contact Ideal or arrange a Gas Safe registered engineer.
When to contact an engineer
Contact Ideal or arrange a Gas Safe registered engineer for diagnosis.
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