BoilerFaultCodesTechnical description
Without flow temperature sensor for low loss header
What causes this fault?
This fault occurs when the boiler loses communication with the sensor responsible for tracking water temperature in the main mixing chamber of your plumbing. The most common reason is that the sensor itself has failed internally or the wiring connecting it to the boiler's main control board has become loose or damaged. Without this data, the boiler cannot accurately balance the heat output for your home.
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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