BoilerFaultCodesViessmann 980 Fault Code
The Viessmann 980 fault code means: your boiler isn't getting enough water flowing through it to heat your hot water tap supply, so it has paused hot water heating until the flow improves, though your central heating may still work.. It appears on 13 Viessmann models in our database.
Technical description: Minimum flow rate not achieved before the start of DHW heating: Shut-off or too much constriction; Scaling or sludge; Incorrect hydraulic configuration; Circulation pump faulty, air in the heating circuit; System pressure unstable or too low
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 980 fault code
Click a model for the full fault code list and model-specific repair notes.
- Vitodens 050-W B0HA-19 Repair: £100-300
- Vitodens 050-W B0HA-25 Repair: £100-300
- Vitodens 050-W B0KA-25 Repair: £100-300
- Vitodens 050-W B0KA-30 Repair: £100-300
- Vitodens 050-W B0KA-30-M Repair: £100-300
- Vitodens 050-W B0KA-35 Repair: £100-300
- Vitodens 100-W B1HF-11 Repair: £120-350
- Vitodens 100-W B1HF-19 Repair: £120-350
- Vitodens 100-W B1HF-25 Repair: £120-350
- Vitodens 100-W B1HF-32 Repair: £120-350
- Vitodens 100-W B1KF-26 Repair: £120-350
- Vitodens 100-W B1KF-30 Repair: £120-350
- Vitodens 100-W B1KF-35 Repair: £120-350
Source
Viessmann 980 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