Heat pumps · Error codes · Clivet
PbClivet
Pb on a Clivet heat pump: Antifreeze protection
Short answer
On a Clivet heat pump, Pb means: Antifreeze protection. The manual does not say whether the heat pump stops. 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: Antifreeze protection.
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: Water side heat exchanger anti-freeze.
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 |
|---|---|
| Severity | Information only |
| Engineer needed? | No |
The manual does not say whether the heat pump stops.
What you can check
- Read the display; this is a protection/indication state and the manual says the unit returns to normal automatically.
- Keep the heat pump powered in cold weather so frost protection can run.
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 171 · Reviewed 23 September 2026
- CLIVET SPHERA EVO 2.0 Service Manual SM21G011GB-00 (27-03-2023) (ManualsLib copy) ↗ · SM21G011GB-00 · page 48 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026