Smell gas? Leave the property and call the National Gas Emergency line on 0800 111 999

E125

Potterton fault code

Potterton E125: water circulation fault

Engineer only

The boiler has detected that water isn't circulating properly through it.

What you can safely do

There is nothing you can safely do yourself with this one. Leave the boiler off and book an 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.

From Potterton's own fault tables. Your model name is usually on the front of the boiler or in the user manual.

Model	Meaning
Potterton Assure (in Baxi's fault table)	Water circulation fault

What causes E125?

It is listed as a water circulation fault, which needs a Gas Safe registered engineer to diagnose.