Ideal · Logic Combi2
F0U boiler fault code
Logic Combi2
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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.
What F0U means
F0U indicates flow/return differential > 50°c.
Safe check
Record the displayed code. Do not open the boiler or inspect the pump, valves or internal water circuit.
When to contact an engineer
The fault remains or returns after the user guide action; contact Ideal if the boiler is under warranty or arrange a Gas Safe registered engineer.
Safety notice
A boiler fault code alone is not a gas or carbon-monoxide emergency. 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.
Source and provenance
- Logic Combi2 User Guide · §1.9, printed p. 9 · F0U Flow/Return Differential > 50°C
user guide
10/2023 · UIN 237664 A01