E008 on a Viessmann Vitocal 100-A: Compressor driver limitation alarm (blocks: Machine)
Short answer
On a Viessmann heat pump, E008 means: Compressor driver limitation alarm (blocks: Machine). The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Compressor driver limitation alarm (blocks: Machine).
Part involved: Compressor driver limitation alarm.
When it shows: If the compressor does not reach the speed at the intended ramp value within 30 minutes, the alarm is triggered and the compressor switches off for safety purposes. The alarm is reset manually if it triggers 3 times an hour.
Likely causes:
- If the compressor does not reach the speed at the intended ramp value within 30 minutes, the alarm is triggered and the compressor switches off ….
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: Auto-resets per s.13 when condition clears; manual reset required if triggered more than 3 times/hour.
Manual reset: Placing the controller in OFF mode resets alarms and hour counters (6167577 s.13, printed p.34); if alarms persist when switched on, contact technical assistance.
What you can check
- Note the E-code (e.g. E006) shown on the Vitocal 100-A controller display and give it to your installer.
- Per 6167577 s.13, switching the controller to OFF resets alarms; if the alarm is still present when switched back on, stop and contact your installer/Viessmann technical assistance (do not keep cycling it).
- Check the heat pump breaker/isolator in the consumer unit is ON and the outdoor unit is not blocked by leaves, debris or snow.
What the engineer will check
- Read alarm log (Hist) on controller; contact Viessmann technical assistance if alarm persists.
Who to ask for: Viessmann-trained heat pump engineer with F-gas refrigeration certification.
Certification: F-gas certificate (UK F-gas Regulations; Viessmann: refrigerant work by authorised refrigeration engineers only).
Sources
- Installation/service instructions Vitocal 100-A outdoor unit controller (6167577, 9/2020) ↗ · 6167577 VSA00001 · page 36 (PDF p.38) table 13.2; detail s.13.11 printed p.34-35 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026