What the manual says
Manufacturer manualSensor fault S1: Air in the installation. Purge the air from the boiler and CH installation. Check the connection of the ntc on the hot water tube. Check wiring for break. Replace S1.
From this model's manual
Verified against the Daikin Ekombg 22 Combi installation & service manual.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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