What does the Baxi EcoBlue E157 fault code mean?
The E157 fault code on the Baxi EcoBlue indicates a thermistor fault, which means that the temperature sensor is malfunctioning or providing incorrect readings. This can lead to improper boiler operation and may affect heating and hot water supply.
Common Causes
- Faulty Thermistor: The thermistor itself may be damaged or have failed, leading to inaccurate temperature readings.
- Wiring Issues: Damaged or loose wiring connections to the thermistor can cause communication problems with the boiler’s control system.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair the issue, as working with gas appliances can be dangerous. Attempting to fix electrical components without proper training may lead to further issues.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing a thermistor on a Baxi EcoBlue is around £120 to £180, which includes parts and labour. This cost reflects the typical price for a replacement thermistor and the service charge of a qualified engineer.