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Christopher MitchellJul 26, 2025
How to fix A7 error on Viessmann VITOCAL 300 Heat Pump?
- JJody DeckerJul 26, 2025
If A7 is displayed on your Viessmann Heat Pump, for type AW, the ventilation duct may be clogged; check and clean the ventilation duct. For type BW, the primary circuit may have leaks or the primary pump may be faulty. For type WW, the intermediate circuit may have leaks or the intermediate circuit pump may be faulty. In these cases, check the pressure gauge and primary pump, and notify your local specialist.
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