Verified boiler fault code

Warmflow E22 Fault Code (Agentis Boilers (B-Series, I-Series and E-Series))

Flash data corrupted.

Safety disclaimer

Boiler repair help from Aza & Sons Services

Fault code summary

Manufacturer: Warmflow
Fault code: E22
Fault type: PCB/electronics, Electrical
Severity: high
Reset: The official table directs the user to a service engineer; no user reset is specified.
Applicable models: B21, B26, B33, I21, I26, I33, I44, I21PRO, I26PRO, I33PRO, I44PRO, I21P/PRO, I26P/PRO, I33P/PRO, I44P, I21S/PRO, I26S/PRO, I33S/PRO, I21C/PRO, I26C/PRO, I33C/PRO, E21, E26, E33, E44, E21PRO, E26PRO, E33PRO, E44PRO, E21P/PRO, E26P/PRO, E33P/PRO, E44P, E21S/PRO, E26S/PRO, E33S/PRO, E21C/PRO, E26C/PRO, E33C/PRO

Quick answer

Flash data corrupted.

What does this fault code mean?

Flash data corrupted.

Common causes

PCB fault

Symptoms

E22 displayed on the LCD

What can the homeowner safely check?

Record the code and do not open the control panel or attempt to reprogramme the boiler.

Boiler reset information

The official table directs the user to a service engineer; no user reset is specified.

When should I call an engineer?

Contact a suitably qualified heating engineer when the fault persists, the boiler locks out, or the manufacturer instructions do not resolve it. For gas appliance work in the UK, use a Gas Safe registered engineer.

Engineer diagnosis

A qualified engineer should diagnose the PCB and data fault.

Applicable boiler models

Related fault codes

Manufacturer documentation

Warmflow Agentis Boiler Manual 6572 G

Last verified

2026-09-12

Frequently asked questions

What does Warmflow E22 mean?

Flash data corrupted.

Can I reset a Warmflow E22 fault?

The official table directs the user to a service engineer; no user reset is specified.