BoilerFaultCodesWhat the manual says
Manufacturer manualCentral heating flow NTC fault
From this model's manual
Verified against the Glow Worm 30ci Plus installation & service manual, page 39.
What causes this fault?
This fault occurs when the boiler's internal computer can no longer read the temperature of the water being sent to your radiators. The most common reason is that the sensor has either suffered an internal electrical failure or the wiring connecting it to the main control board has become loose or corroded. Because the boiler cannot safely monitor how hot the water is getting, it shuts down as a safety precaution.
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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