Heat pumps · Error codes · Vokèra
28Vokèra · Vokera AriaPRO (R410A inverter)
28 on a Vokèra Vokera AriaPRO: Discharge temperature error
Short answer
On a Vokèra heat pump, 28 means: Discharge temperature error. 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: Discharge temperature error.
Likely causes:
- Not stated in the AriaPRO table; the unit is secured and blocked - wait at least 10 minutes before restart; repeated occurrences require checking unit components.
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
What you can check
- Read and note the exact code shown on the controller display.
- Check the heat pump's breaker/isolator at the consumer unit is on.
- Check the outdoor unit is not blocked by leaves, debris or snow and has clear space around it.
- Restart once via the controller (OFF then ON) as the manual allows; if the code returns, call an engineer.
What the engineer will check
- Not stated in the AriaPRO table; the unit is secured and blocked - wait at least 10 minutes before restart; repeated occurrences require checking unit components.
Sources
- Vokera AriaPRO Installation and Servicing Instructions, booklet cod. R&S 330 Rev. 0 (4/11) ↗ · R&S 330 Rev. 0 · page 29 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026