Heat pumps · Error codes · Clivet
H8Clivet
H8 on a Clivet heat pump: Pressure sensor error
Short answer
On a Clivet heat pump, H8 means: Pressure sensor error. The manual does not say whether the heat pump stops. An engineer is needed to fix the cause. The wording differs by model range — each is shown below.
Reviewed 23 September 2026 · 2 sources
What it means
On the Edge EVO 2.0 EXC (WiSAN-YME 1 S)
The manual says: Pressure sensor error.
Likely causes:
- See Clivet WiSAN-YME manual corrective-action column for this code (not reliably transcribed).
On the Sphera EVO 2.0 (MiSAN-YEE split + SQKN-YEE indoor)
The manual says: High pressure sensor error.
Likely causes:
- See Sphera EVO 2.0 service manual troubleshooting (p.49-105) for this code.
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
On the Edge EVO 2.0 EXC (WiSAN-YME 1 S)
- See Clivet WiSAN-YME manual corrective-action column for this code (not reliably transcribed).
On the Sphera EVO 2.0 (MiSAN-YEE split + SQKN-YEE indoor)
- See Sphera EVO 2.0 service manual troubleshooting (p.49-105) for this code.
Sources
- CLIVET WiSAN-YME 1 S 2.1-14.1 Manual for Installation, Use and Maintenance, M0PE00002-00 10-22 (ManualsLib copy) ↗ · M0PE00002-00 · page 169 · Reviewed 23 September 2026
- CLIVET SPHERA EVO 2.0 Service Manual SM21G011GB-00 (27-03-2023) (ManualsLib copy) ↗ · SM21G011GB-00 · page 47 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026