BoilerFaultCodesYour boiler's internal temperature sensors are sending incorrect signals, preventing the system from heating your water or radiators safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Temperature sensors faulty (DHW and CH sensors).
What causes this fault?
This fault occurs when the boiler's internal sensors, which monitor the heat of your water, begin sending incorrect or or 'out-of-range' electrical signals to the main control board. The most common reason is that the sensors have physically degraded over time or developed a scale buildup, meaning they can no longer accurately measure temperature to keep the system running safely.
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 E05 — no call-out fees, no surprises.
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