Platform & Control Notes
Vitodens 100-W / 200-W / 222-F fault codes. These models share the same Viessmann control platform and fault code set. Reset is via the 'R' button on the control panel. Codes starting with letters (E_, F_, B_) appear on the boiler display. Some additional 'detailed codes' (plain numbers) appear in the service menu under coding address 38:XX and indicate hold/wait states rather than hard faults.
Model Families & Platforms
- Vitodens 100-W (Compact residential condensing boiler)
- Vitodens 200-W (Advanced residential condensing boiler)
- Vitodens 222-F (Floor-standing condensing boiler with storage tank)
Diagnostic Characteristics & Common Service Topics
Viessmann boilers utilize specific display codes and safety lockouts to protect the heat exchanger, combustion system, and hydronic loop. Everyday issues like pressure loss, flame sensing errors, or circulator faults trigger specific responses depending on the controller generation.
| Code | Meaning | Action Required |
|---|---|---|
| 30 | Burner blocked — short circuit on boiler water temperature sensor. | Sensor diagnosis/replacement is a tech task. Call a pro if the boiler stays blocked. |
| 38 | Burner blocked — boiler water temperature sensor cable broken (open circuit). | Sensor diagnosis/replacement is a tech task. Call a pro if the boiler stays blocked. |
| B0 | Burner blocked — flue gas temperature sensor shorted out. | Flue-sensor diagnosis is a pro task; call a tech to check the sensor and wiring. |
| B8 | Burner blocked — flue gas temperature sensor cable broken (open circuit). | Flue-sensor diagnosis is a pro task; call a tech to check the sensor and wiring. |
| E1 | Ionization current too high during calibration. | Combustion/calibration fault — call a pro to check the ionization electrode gap and combustion air quality. Press 'R' to reset. |
| E2 | Heating water flow rate too low during calibration. | Check boiler pump flow and ensure adequate circulation volume. Remove scaling or blockage. Press 'R' to reset. |
| E3 | Heat transfer too low during calibration — temperature limiter caused shutdown. | Ensure adequate heat transfer and water flow. Press 'R' to reset. Repeated faults need a pro. |
| E5 | Burner blocked — flame amplifier fault. | Call a pro — control unit likely needs replacement. |
Complete Error Code Library
For the complete searchable error-code lookup table for Viessmann equipment (including all 33 codes, exact lockout causes, and technician actions), visit the Phillips Hydronics Error Code Library.
Related Symptom & Diagnostic Guides
Sources & Documentation
- error-codes.json — Viessmann Detailed Fault Codes for Vitodens 200-W and 222-F (11/2017); Vitodens 100-W B1HE Installation & Service Instructions