Verified boiler fault code

Warmflow E31 Fault Code (Agentis Boilers (B-Series, I-Series and E-Series))

Remote-control communication error.

Safety disclaimer

Boiler repair help from Aza & Sons Services

Fault code summary

Manufacturer: Warmflow
Fault code: E31
Fault type: Communication, Electrical
Severity: medium
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

Remote-control communication error.

What does this fault code mean?

Remote-control communication error.

Common causes

Damaged remote-control cable
Remote-control fault

Symptoms

E31 displayed on the LCD

What can the homeowner safely check?

Check that the remote control has not been switched off and record the code; do not open the boiler.

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 inspect the remote-control cable, remote control and control interfaces.

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 E31 mean?

Remote-control communication error.

Can I reset a Warmflow E31 fault?

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