The error E11 means that there is a significant temperature difference between the water inlet and outlet.

To identify the problem, here are the two checks to perform:

If the code E3 appears before E11:
- Depending on the operating mode of the device, the compressor shutdown cycle of the heat pump (PAC) is too long, which results in a temperature increase in the heat exchanger.
--> Adjust parameter P8 from 10°C to 20°C (instructions will be provided), allowing the compressor more time to shut off before displaying the error.

If the code E3 does not appear:
- This may indicate a flow sensor fault that is not signaling the PAC to shut off when filtration stops. In this case, the flow sensor should be replaced.

- Disconnect the power to the PAC to clear the E11 error.
- Disconnect the power to the filtration pump.
- Restart the PAC, leave the filtration pump turned off, and check if the error code E3 appears.
- If the E3 code appears, unscrew the water outlet connection, manually test the flow sensor by gently pulling on it to activate it, and check if the E3 code has disappeared.

You can then re-establish the water outlet connection.

If the problem persists, we recommend checking the settings of your valves and bypass:
- Inlet at 100%
- Outlet at 100%
- Bypass at 50%

If the problem continues, we suggest electrically disconnecting the unit, removing the top cover, and swapping sensors CN17 and CN18.
- If the error code changes, this indicates that sensor CN18 is faulty.
- If the error code remains the same, there is an issue with the electronic board.

After this check, it is imperative to put the sensors back in their original positions.