Verified boiler fault code

Warmflow E62 Fault Code (Agentis Boilers (B-Series, I-Series and E-Series))

MMI/control-PCB error on the boiler.

Safety disclaimer

Boiler repair help from Aza & Sons Services

Fault code summary

Manufacturer: Warmflow
Fault code: E62
Fault type: PCB/electronics, Electrical
Severity: high
Reset: The manual directs the user to a service engineer; no user repair or 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

MMI/control-PCB error on the boiler.

What does this fault code mean?

MMI/control-PCB error on the boiler.

Common causes

Damaged cable in control-panel PCB
PCB fault

Symptoms

E62 displayed on the LCD

What can the homeowner safely check?

Record the code and do not open the control panel or attempt to inspect the PCB.

Boiler reset information

The manual directs the user to a service engineer; no user repair or 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 assess the control-panel cable, boiler PCB and related electronics.

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 E62 mean?

MMI/control-PCB error on the boiler.

Can I reset a Warmflow E62 fault?

The manual directs the user to a service engineer; no user repair or reset is specified.