BoilerFaultCodesViessmann 364 Fault Code
The Viessmann 364 fault code means: your boiler's internal control system has detected a fault and may have shut down, so heating or hot water may be unavailable until a qualified engineer checks it.. It appears on 13 Viessmann models in our database.
Technical description: Internal fault.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Viessmann models that show the 364 fault code
Click a model for the full fault code list and model-specific repair notes.
- Vitodens 050-W B0HA-19 Repair: £180-450
- Vitodens 050-W B0HA-25 Repair: £180-450
- Vitodens 050-W B0KA-25 Repair: £180-450
- Vitodens 050-W B0KA-30 Repair: £180-450
- Vitodens 050-W B0KA-30-M Repair: £180-450
- Vitodens 050-W B0KA-35 Repair: £180-450
- Vitodens 100-W B1HF-11 Repair: £90-200
- Vitodens 100-W B1HF-19 Repair: £90-200
- Vitodens 100-W B1HF-25 Repair: £90-200
- Vitodens 100-W B1HF-32 Repair: £90-200
- Vitodens 100-W B1KF-26 Repair: £90-200
- Vitodens 100-W B1KF-30 Repair: £90-200
- Vitodens 100-W B1KF-35 Repair: £90-200
Source
Viessmann 364 fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026