BoilerFaultCodesDaikin E1-69 / E1-70 Fault Code
Also written as E169E170 — same fault.
The Daikin E1-69 / E1-70 fault code means: your boiler’s internal computer has encountered a software error while checking its settings, which has caused the system to stop working for safety.. It appears on 1 Daikin model in our database.
Technical description: Parameter CRC fault – try resetting the boiler
What causes the Daikin E1-69 / E1-70 fault?
This fault occurs when the boiler's internal computer detects a data corruption error between its main memory and the settings plug. It essentially means the boiler can no longer verify its own configuration, so it shuts down as a safety precaution to prevent running with incorrect instructions. The most common reason is a failing main circuit board or a loose electrical connection at the parameter plug.
DIY fix possible
Locate the power switch or fused spur for the boilerTurn the power off for 30 secondsTurn the power back on and press the 'Reset' button on the display panelMonitor the boiler to see if the error screen clears
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Gas Safe Register →Daikin models that show the E1-69 / E1-70 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Daikin E1-69 / E1-70 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