BoilerFaultCodes Overheat Detection High
Your boiler has automatically turned itself off because it detected that the water inside has become dangerously hot.
Call an engineer soon
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: If a temperature over 100°C is detected in the primary circuit by the sensor 23, the safety solenoids close and the fan stops. It is possible to reset the boiler when the primary circuit temperature falls below 76°C.
Typical repair cost £150-300 (including labour)
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.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like Overheat Detection — no call-out fees, no surprises.
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Chaffoteaux Talia Green 25 is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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