Potterton Assure Fault Codes

The Potterton Assure is the brand's current range — combi, system and heat-only boilers launched in 2019 on the same modern BDR Thermea platform as the Baxi 800/600 family. As Potterton's contemporary offering it carries the group's up-to-date fault reporting; owners will meet E-prefixed codes for lockouts and temporary-block conditions shown on a modern backlit display, with the platform's improved precision over the older single E-number scheme. The Assure sells strongly into social housing and new installations, so many are young boilers under warranty — which sets the ownership playbook: homeowner basics for pressure and winter condensate, the code noted exactly for anything else, and Potterton's support line while cover lasts. The codes below link through to full diagnosis pages.

Where Assure fault codes appear

The Assure has a modern backlit display showing status in normal running and the fault code when tripped. Record the code exactly as displayed — a photo is reliable — including any prefix or second part, before resetting or reporting it.

Resetting a Potterton Assure

Press the reset button briefly; the boiler clears and retries. Low-pressure faults want the system topped up to 1–1.5 bar via the filling loop first — the display shows pressure. On a warrantied Assure, a returning code is a support-line call with your registration details, not a paid repair.

Common Assure problems

As a current range the Assure's real-world list is short and universal: pressure events on small sealed systems, winter ignition lockouts from frozen condensate runs, occasional sensor codes. Register the warranty, keep the annual service, and insist on clean system water at installation — the three habits that keep a modern boiler off its own fault-code pages.

Most common Assure fault codes

See all Potterton fault codes →

Last reviewed 25 August 2026.