High Lockout
E130 on Main Eco Compact

Your boiler has shut down because a sensor has detected that the exhaust gases are becoming too hot, which is a safety feature to prevent damage.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description

Flue negative thermistor coefficient (NTC) sensor operated

What causes this fault?

This fault occurs when the internal temperature of the exhaust gases exceeds a safe limit, triggering a safety shut-off to protect the boiler. The most common reasons are a build-up of debris or limescale inside the main heat exchanger which prevents heat from transferring to the water, or damaged internal insulation that is allowing too much heat to reach the sensor.

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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Related fault codes

E110View →

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