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Viessmann · Heat pumps · Viessmann Vitocal 250-A (One Base, monobloc)

F.790Motor of 4/3-way valve not correctly mounted; 4/3-way valve faulty

Name in the manufacturer's documentation (service manual): Motor of 4/3-way valve not correctly mounted; 4/3-way valve faulty[1]

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The Polish page has more detail (plain-language explanation, safe checks, guides): Read in Polish →

Sources

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  1. [1] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 60 manufacturer document – copy from a distributor quote verified F.790
  2. [2] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 60 manufacturer document – copy from a distributor quote verified Motor of 4/3-way valve not correctly mounted
  3. [3] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 60 manufacturer document – copy from a distributor quote verified Check mounting of motor: See separate installation instructions
  4. [4] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 60 manufacturer document – copy from a distributor quote verified Check hydraulic and electrical connections of 4/3-way valve
  5. [5] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 60 manufacturer document – copy from a distributor quote verified Check motor of 4/3-way valve
  6. [6] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 60 manufacturer document – copy from a distributor quote verified Replace motor and/or 4/3-way valve if required