Vokèra A02 Fault Code (Vision C)

Safety disclaimer

Fault code summary

Manufacturer

Vokèra

Fault code

A02

Fault type

Overheating, Safety lockout

Severity

lockout

Reset

The Vision C table says Reset, then check appliance operation; frequent resets require an installer.

Applicable models

Vision Combi 25 C, Vision Combi 30 C

Quick answer

Limit thermostat fault.

What does this fault code mean?

Limit thermostat fault.

Common causes

• Limit thermostat fault.

Symptoms

• Vision C displays A02 as a final alarm.

What can the homeowner safely check?

• Use the documented reset only once and check whether the appliance operates normally.

Boiler reset information

The Vision C table says Reset, then check appliance operation; frequent resets require an installer.

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

• Investigate the limit thermostat and boiler temperature condition.

Applicable boiler models

• Vision Combi 25 C
• Vision Combi 30 C

Related fault codes

• A01 — Vision C

  Ignition failure, flame not sensed, or internal fault.

  Read fault code
• A03 — Vision C

  Fan tachometer signal fault.

  Read fault code
• A04 — Vision C

  Insufficient system water pressure.

  Read fault code
• A06 — Vision C

  Domestic-hot-water thermistor fault.

  Read fault code
• A07 — Vision C

  Primary-flow thermistor fault, overtemperature or temperature differential condition.

  Read fault code
• A08 — Vision C

  Return thermistor fault, overtemperature or inverted temperature differential.

  Read fault code
• A09 — Vision C

  Flue thermistor or flue-thermistor counter fault, or flue thermistor overtemperature.

  Read fault code
• A77 — Vision C

  Low-temperature thermostat fault.

  Read fault code

Manufacturer documentation

FAULT CODES — A02: Limit thermostat fault; Final; Reset, check appliance operation.

Last verified

2026-09-12

Frequently asked questions