BoilerFaultCodesDaikin E1-71 Fault Code
Also written as E171 — same fault.
The Daikin E1-71 fault code means: your boiler has experienced a fundamental electronic control failure that has caused it to lock down for safety.. It appears on 1 Daikin model in our database.
Technical description: EK lockout failure – this is a permanent error
What causes the Daikin E1-71 fault?
This fault occurs when the boiler's internal computer, or 'brain', suffers a critical hardware failure that prevents it from managing safety functions. It is typically caused by a component failure on the printed circuit board or a communication breakdown between the electronic control box and the rest of the system. Because the boiler can no longer guarantee safe operation, it will stop working immediately and cannot be overridden.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Daikin models that show the E1-71 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Daikin E1-71 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