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Heat pumps · Error codes · Clivet
L9Clivet

L9 on a Clivet heat pump: Compressor frequency difference to target greater than 15 Hz

Short answer

On a Clivet heat pump, L9 means: Compressor frequency difference to target greater than 15 Hz. 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: Compressor frequency difference to target greater than 15 Hz.

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: Actual compressor frequency differs from target frequency by more than 15 Hz protection.

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.
  • 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

A code explains what the controller detected, not a confirmed root cause.

Reviewed: 23 September 2026