E20Baxi
Baxi E20: central heating temperature sensor fault: short circuit or open circuit
Checked against Baxi's own documentation: Baxi: boiler error codes. Last reviewed October 2026. How we check
Engineer only
Baxi describes E20 on Platinum, Duo-tec, EcoBlue, Megaflo, Assure, Main Eco and original 600/800 boilers as: central heating temperature sensor fault: short circuit or open circuit.
What you can safely do
There is nothing you can safely do yourself with this one. Leave the boiler off and book an engineer.
Before you book an engineer
- Write down the code exactly as the display shows it: E20.
- Find your boiler's model name. It is usually on the front panel or in the user manual. The table below shows why it matters: Baxi codes can mean different things on different models.
- Note when it started and what the boiler was doing (heating, hot water, or starting up).
- If the boiler is still under warranty, check your warranty paperwork before you book anyone.
Call a Gas Safe engineer if
- Book a Gas Safe registered engineer.
Find a Gas Safe engineer near you
Opens the official Gas Safe Register search.
Applies to Platinum, Duo-tec, EcoBlue, Megaflo, Assure, Main Eco and original 600/800. Codes can differ between models, so check your manual.