Viessmann OC Fault Code (Vitodens 200 fault-code checker row)

Safety disclaimer

Fault code summary

Manufacturer

Viessmann

Fault code

OC

Fault type

Flame detection, Safety lockout

Severity

high

Reset

Not specified

Applicable models

Vitodens 200

Quick answer

Flame signal still present after switching off.

What does this fault code mean?

Flame signal still present after switching off.

Common causes

• Flame signal remains after the burner is switched off.

Symptoms

• Burner control switches to lockout.

What can the homeowner safely check?

This information was not provided in the verified manufacturer source.

Boiler reset information

Reset information was not provided in the verified manufacturer source. Do not repeatedly reset an unresolved fault.

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

• Assess flame detection and burner shut-off.

Applicable boiler models

• Vitodens 200

Related fault codes

No related verified fault codes are available for this range.

Manufacturer documentation

Fault Code OC | Vitodens 200 | Burner control switches to lockout | Flame signal still present after switching off

Last verified

2026-09-12

Frequently asked questions