E321
Potterton fault code
Potterton E321: hot water temperature sensor fault (also shown as 163)
Engineer only
Potterton describes E321 on Potterton Assure (in Baxi's fault table) boilers as: hot water temperature sensor fault (also shown as 163).
What you can safely do
There is nothing you can safely do yourself with this one. Leave the boiler off and book an engineer.
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: Potterton Assure (in Baxi's fault table). Codes can differ between models, so check your manual.