MEDIUMError Code
2F: Outdoor Temperature Sensor Fault (Boiler - Viessmann)
Viessmann boiler outdoor temperature sensor has failed or reading incorrectly.
What This Error Code Means
Outdoor sensor circuit is open, shorted, or out of range.
Common Causes
Sensor wiring damaged
Outdoor sensor failed
Corrosion at connections
Direct sun exposure
Water ingress in housing
Affected Brands
Viessmann
How ROMA Heating Fixes This Error Code
Check sensor wiring for damage
Measure sensor resistance
Clean connections
Replace outdoor sensor
Verify weather-dependent control
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