Problem:

High and Low-Pressure Protection.

Origin:

Here are the possible reasons:

• Insufficient water flow.

• Gas overload.

• High or low-pressure sensor fault.

Solution:

First, disconnect the heat pump for 1 minute, then power it back on and check if the error code is still present.

Is the error still there?

Please ensure that the pressure gauge is not reading 0 when the heat pump is turned off.

If the needle is at 0, it indicates a lack of gas in the heat pump, and a service request will be required.

If the pressure gauge reads correctly (ambient air temperature displayed in degrees on the gauge when the heat pump is defrosted and has been off for at least 30 minutes), you should test the flow sensor.

The flow sensor is a blade located at the heat exchanger outlet:

Ensure that the blade's orientation is correct.

Next, you can manually test the sensor. To do this:

Stop the circulation, leaving the heat pump on.

Unscrew the sensor.

Press the sensor in the direction of the arrow until the heat pump starts.

For code E05, it may occur during the first use or due to a gas leak for E06. Check the pressure gauge reading when the heat pump is off to ensure it's not at 0.

• Change the operating mode and see if the code appears in other modes. If the code disappears, the 4-way valve has been reset.

• High or low-pressure sensor fault. To check this, inspect the connections of these high-pressure and low-pressure sensors as indicated in the electrical diagram of the user manual.

Try swapping the sensors to see if the code changes.

If it changes, the sensor needs to be replaced.

Please note that a qualified technician should perform any work related to the refrigerant gas when replacing this sensor !