Fault 100 means electronics modules connected to PlusBus are not functioning due to a voltage error on PlusBus. The manual's first action is: “Check whether the PlusBus power supply on the HBMU heat management unit is OK: Remove all connected PlusBus components and reconnect one by one. Check that no more than 1 Vitolrol 200-E is connected to the HBMU. Check whether there is a short circuit at the PlusBus cable.”
- Model
- Viessmann Vitodens 111-W
- Display shows
- Electronics modules connected to PlusBus not functioning (100)
- Type
- Fault code
- Source
- Manual p. 71
What 100 means
Electronics modules connected to PlusBus not functioning p. 71
Common causes
- Voltage error PlusBus p. 71
What to do
- Check whether the PlusBus power supply on the HBMU heat management unit is OK: Remove all connected PlusBus components and reconnect one by one. Check that no more than 1 Vitolrol 200-E is connected to the HBMU. Check whether there is a short circuit at the PlusBus cable. p. 71
If 100 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 100; 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.