F.160 on a Viessmann One Base: CAN bus general communication fault between the affected electronics modules
Short answer
On a Viessmann heat pump, F.160 means: CAN bus general communication fault between the affected electronics modules. The manual does not say whether the heat pump stops. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: CAN bus general communication fault between the affected electronics modules.
Part involved: CAN bus general communication fault between the affected electronics modules.
When it shows: System characteristics: No communication between the affected electronics modules.
Likely causes:
- CAN bus general communication fault between the affected electronics modules.
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Resetting itself: Not stated per code in Viessmann document 6171807 GB 10/2021.
Manual reset: User may acknowledge via HMI after noting the code (6249162 p.57); the message returns if the cause persists.
What you can check
- On the HMI, tap the message and "?" to read the system characteristics and Viessmann's user tips; note the code (e.g. F.xxx) and text for your contractor (operating instructions 6249162 p.57).
- Acknowledge the message once via the HMI; do not acknowledge fault messages several times in quick succession (6249162 p.58) - notify your contractor.
What the engineer will check
- Check the CAN bus cable.
- Check the CAN bus subscriber numbers.
- Isolate the system from the power supply. Restart the system. If the fault persists, replace the CAN bus cables. Replace the electronics modules if required.
Who to ask for: Viessmann-trained heat pump installer/service engineer.
Sources
- Installation and service instructions Vitocal 150-A, AWO(-M)-E-AC/AWO(-M)-E-AC-AF 151.A (6171807, 2021-10) ↗ · 6171807 VSA00001 · page 104 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026