BoilerFaultCodesDaikin U4-67 Fault Code
Also written as U467 — same fault.
The Daikin U4-67 fault code means: your boiler has experienced a communication error that has stopped it from working, and it requires a manual power reset to clear the internal memory.. It appears on 1 Daikin model in our database.
Technical description: Remote reset supervision, switch off the power at the mains – if problem repeats Contact a heating engineer
What causes the Daikin U4-67 fault?
This fault occurs when the boiler's internal computer loses track of its safety checks and needs to clear its temporary memory. The most common reason is a brief disruption in communication between the main control board and the display, or an electrical glitch that causes the software to stall. If a power reset doesn't work, it usually indicates that the wiring has come loose or the electronic circuit board is failing.
DIY fix possible
Locate the fused spur switch or main power switch for the boilerTurn the power 'Off' and wait for at least 30 secondsTurn the power back 'On' and wait for the boiler to restart
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Gas Safe Register →Daikin models that show the U4-67 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Daikin U4-67 fault code information on this page is sourced and cross-checked against the official Daikin service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026