What does the Baxi E118 fault code mean?
The Baxi E118 fault code indicates a problem with the primary flow temperature sensor, which is responsible for measuring the temperature of the water flowing through the heating system. This fault can prevent the boiler from operating efficiently, leading to heating issues within the property.
Common Causes
- Faulty Temperature Sensor: The primary flow temperature sensor may be malfunctioning or damaged, leading to incorrect temperature readings.
- Wiring Issues: There could be damaged or loose wiring connections between the sensor and the boiler’s control board, affecting the sensor’s performance.
Can I fix it myself? (DIY)
This fault typically involves internal components and electrical connections, so it is recommended that a Gas Safe Engineer is required to diagnose and repair the issue safely.
Estimated Repair Cost (2026 UK Prices)
The estimated cost for repairing the E118 fault code is likely to be between £150 and £250. This includes approximately £100-£150 for the replacement of the primary flow temperature sensor and £50-£100 for labor, depending on the engineer’s rates.