BoilerFaultCodesYour boiler has detected that a key temperature sensor has failed or disconnected, which is preventing the system from heating up safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Primary thermistor open circuit.
What causes this fault?
This fault occurs when the boiler's main control board loses communication with the temperature sensor that monitors the heat exchanger. The most common reason is that the internal sensor component has failed due to age, or the electrical wiring connecting it to the brain of the boiler has become loose or damaged.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
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A boiler cover plan would cover faults like 07 — no call-out fees, no surprises.
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