BoilerFaultCodesYour boiler's main temperature sensor has developed a fault or is disconnected, meaning the system cannot safely monitor how hot the water is getting.
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 fault
What causes this fault?
This fault occurs when the boiler's control board loses communication with the sensor that measures the water temperature. The most common reason is that the sensor has physically failed due to wear and tear, or the electrical connection between the sensor and the main circuit board has become loose or corroded.
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 E07 — no call-out fees, no surprises.
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