Keston Fault Codes

Select a fault code to see its meaning, common causes and how to fix it.

E01 The E01 code appears on Keston C36 boilers (note: the equivalent fault on C40 and C55 models is E02) when the boiler… Read more →
E05 The E05 code is a lockout fault on Keston boilers, but its precise meaning varies by model. On the Keston C36 combi,… Read more →
E09 The E09 code on a Keston boiler indicates a valve drive error — the boiler's control system has detected that the gas… Read more →
E10 The E10 code on a Keston boiler signals that the control board (PCB) has detected an internal error and cannot operate… Read more →
E44 The E44 code on Keston boilers signals that the system water pressure has fallen below the acceptable threshold —… Read more →