Verified boiler fault code
Viessmann 10 Fault Code (Vitodens/Vitotronic fault-code checker row for outdoor sensor)
Short circuit in the outdoor temperature sensor.
Safety disclaimer
Fault code summary
- Manufacturer
- Viessmann
- Fault code
- 10
- Fault type
- Temperature sensor, Electrical
- Severity
- Not specified
- Reset
- Not specified
- Applicable models
- Vitodens 200-W, Vitodens 222-F, Vitotronic 300, Vitotronic 200, Vitotronic 200-H, Vitodens 050/200-H, Vitodens 300-K, Vitocontrol-S
Quick answer
Short circuit in the outdoor temperature sensor.
What does this fault code mean?
Short circuit in the outdoor temperature sensor.
Common causes
- Outdoor temperature sensor short circuit.
Symptoms
- Boiler operates based on outdoor temperature of 0°C/32°F or in constant mode, depending on the listed control.
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 the outdoor temperature sensor and its cable.
Applicable boiler models
Related fault codes
Manufacturer documentation
Viessmann UK Fault CodesFault Code 10 | Vitodens 200-W / 222-F / Vitotronic 300 / 200/ 200-H / 050/200-H / 300-K / vitocontrol-S | Short circuit – Outdoor temperature sensor
Last verified
2026-09-12
Frequently asked questions
What does Viessmann 10 mean?
Short circuit in the outdoor temperature sensor.