BoilerFaultCodesDaikin 27 Fault Code
The Daikin 27 fault code means: your boiler has lost its connection to the weather sensor outside, but your heating and hot water should still continue to work normally using default settings.. It appears on 2 Daikin models in our database.
Technical description: Short circuit outdoor sensor - Check the wiring of the outdoor sensor. Replace outdoor sensor. Boiler controller is not suitable for this application. Replace boiler controller for the appropriate version.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like 27: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Daikin models that show the 27 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Daikin 27 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 31 August 2026