BoilerFaultCodesWhat the manual says
Manufacturer manualDomestic hot water (DHW) sensor short circuit – check connections to DHW sensor are in place
From this model's manual
Verified against the Keston C36 installation & service manual, page 32.
What causes this fault?
This fault occurs when the boiler's internal computer receives an incorrect electrical signal from the sensor that monitors your hot water temperature. The most common reason is that the sensor has suffered a physical failure or an electrical short, preventing the boiler from knowing how hot the water is. It can also be caused by loose or damaged wiring between the sensor and the main control board.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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