L9 error with Mitsubishi ecodan heat pump

Michel54 · 2024-12-15T19:54:43Z

Hi everyone, Two years ago, I purchased a 14kW Ecodan air-to-water heat pump with R32 refrigerant. Recently, I decided to install a Wi-Fi remote to monitor the temperature in my living room and control the heating more efficiently. However, after enabling the remote, I encountered an issue where the system displays an L9 error after a few hours, and the heat pump shuts down. Based on my research, this error seems to indicate a flow issue. I have already taken the following steps to resolve it: Cleaned the water filter: I ensured there was no debris or blockages in the system. Checked the water pressure: It is approximately 1.6 bars when the system is off, which seems to be within the acceptable range. Increased the pump speed: I set the pump speed to level 5 to rule out insufficient flow as the cause. Unfortunately, none of these actions resolved the issue. During my observations, I noticed something unusual: the circulatory pump does not start even when the room temperature is below the set temperature. The pump only starts if I manually trigger it through the heat pump settings. Once it starts, it operates normally, which suggests the pump itself is not faulty. Additionally, I activated the feature to display the ambient temperature reading, and the values seem accurate. This makes it even more puzzling why the circulatory pump fails to start automatically. At this point, I am left without heating and am unsure how to proceed. Does anyone have any insights into the cause of the L9 error or potential solutions to this issue? Thank you in advance for your help!

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SUNandAIR

(@sunandair)

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24/12/2024 3:32 pm

@michel54 it’s really good news that your heating is now working. It’s always a bit unnerving, offering advice without fully knowing the system. I hope everything continues to work effectively for you...

best wishes

👍

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L9 error with Mitsubishi ecodan heat pump

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