Fault 163 indicates the burner is in a fault state due to a checksum error during data memory access on the HBMU heat management unit. The manual's first action is: “Reset the appliance. If the fault occurs repeatedly, replace the HBMU heat management unit. See chapter "Replacing the HBMU heat management unit".”
- Model
- Viessmann Vitodens 111-W
- Display shows
- Burner in a fault state (163)
- Type
- Fault code
- Source
- Manual p. 72
What 163 means
Burner in a fault state p. 72
Common causes
- Checksum error, data memory access, HBMU heat management unit p. 72
What to do
- Reset the appliance. If the fault occurs repeatedly, replace the HBMU heat management unit. See chapter "Replacing the HBMU heat management unit". p. 72
If 163 is still not resolved
The manual gives no further instruction for this code. Open the code table in the PDF or contact Viessmann service.
This page summarises what the manufacturer’s manual says about 163; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with Viessmann. Found a mistake? Report an error.