BoilerFaultCodesWhat the manual says
Manufacturer manualCentral heating flow NTC fault
From this model's manual
Verified against the Glow Worm Ci Range installation & service manual, page 34.
What causes this fault?
This fault occurs when the internal sensor responsible for monitoring the heat of the water leaving the boiler fails or sends an incorrect signal. The most common reason is that the sensor has physically degraded over time or developed an electrical short, meaning the boiler can no longer safely regulate its temperature. In some cases, it may be caused by loose or damaged wiring connecting the sensor to the main control board.
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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