What it means
Baxi's Platinum, Platinum+, Assure, Duo-tec 2 GA and EcoBlue Advance user guides all list E20. Platinum boilers show E followed by the number; the others show 20 next to an error symbol.
What to check, in order
- Write down the code
Baxi's Platinum user guide says E20 indicates a faulty component: make a note of it.
- Contact your installer or a Gas Safe engineer
Baxi gives no fix you can do yourself for E20.
When to call a Gas Safe engineer
Baxi's code list calls E20 a central heating NTC sensor fault: a short circuit or open circuit in the sensor or its wiring.
A repair visit will usually check the sensor's reading and its wiring.
- Note the model and serial number. They're on a label on the data badge, usually under the boiler or behind the front cover.
- Write down the exact code, and what the appliance was doing when it appeared.
- Check whether it's still under warranty. If it is, the repair may cost you nothing.
Quick answers
What does the Baxi E20 fault code mean?
The sensor that measures the heating water temperature, or its wiring, has failed, so the boiler has stopped for safety. Baxi's Platinum, Platinum+, Assure, Duo-tec 2 GA and EcoBlue Advance user guides all list E20. Platinum boilers show E followed by the number; the others show 20 next to an error symbol.
Can I fix Baxi E20 myself?
Engineer only (engineer visit). Start with: write down the code; contact your installer or a Gas Safe engineer. Baxi's code list calls E20 a central heating NTC sensor fault: a short circuit or open circuit in the sensor or its wiring.
Is Baxi E20 worth repairing?
Worth fixing. A temperature sensor is a routine part for an engineer to replace.
Checked against
Last reviewed October 2026. Manufacturers update their pages, and your manual is the final word. Spotted a mistake? Email contact@appliance-error-codes.com.