Boiler locks out with E14; may indicate domestic hot water (DHW) sensor fault on combi models.

Safety: Turn off power and close domestic water isolation valves before removing any DHW components.

• Locate DHW sensor: On IBC combi boilers, the DHW sensor is typically mounted on the DHW outlet or plate heat exchanger.
• Inspect wiring: Ensure the sensor connector is firmly attached and the cable is not damaged or wet.
• Check mounting: Confirm the sensor is properly inserted or clamped to the DHW outlet for accurate temperature reading.
• Reset: Restore power and clear the error. If E14 returns, the sensor is likely defective.

Replace the DHW temperature sensor with the correct IBC part. If the error remains, the control board may require professional diagnosis and replacement.