Possible causes of Err9 error code:

1. Water level sensor issue:

• Faulty sensor: The sensor responsible for measuring water level might be malfunctioning, leading to inaccurate readings and triggering the error.
• Blockage: Debris or limescale buildup might obstruct the sensor, preventing it from getting accurate readings.

2. Water intake system issue:

• Faulty inlet valve: The valve that controls water flow into the machine might be stuck open, causing overfilling and triggering the Err9 code.
• Blocked hose or filter: Kinks or blockages in the water inlet hose or filter can restrict water flow and lead to the error.

3. Control board malfunction:

• Less commonly, the error could indicate a problem with the control board itself, misinterpreting signals from the sensors or sending incorrect commands to the inlet valve.

4. Other potential causes:

• Leaking drum: A small leak in the drum could cause the water level to rise unexpectedly, triggering the error.
• Drain hose issues: A faulty drain hose connection or blockage could prevent proper water drainage, leading to overfilling and the Err9 code.

Troubleshooting the Err9 error code in Haier Washing Machine

Important disclaimer: Before attempting any troubleshooting, always unplug the machine and turn off the water supply for safety reasons. It's crucial to consult your user manual for specific instructions related to your model and the Err9 code.

1. Reset the machine: 
   • Sometimes, a simple reset can clear temporary glitches. Unplug the machine for a few minutes and then plug it back in.
2. Check for leaks: 
   • Inspect the machine for any visible leaks around the hoses, connections, or drum.
3. Clean the drain filter: 
   • Locate and clean the drain filter according to your manual's instructions. A clogged filter can restrict water flow and contribute to overfilling.
4. Visually inspect the hoses: 
   • Look for any kinks, twists, or blockages in the water inlet and drain hoses. Clear any obstructions and straighten any bends.
5. Check the pressure sensor: 
   • If your model allows, consult your manual to locate and visually inspect the pressure sensor for any visible debris or damage. Do not attempt to clean or manipulate the sensor unless you have expertise in appliance repair.

If the problem persists:

• Consult your user manual: Refer to your specific model's manual for troubleshooting instructions related to the Err9 code. It might provide additional details or model-specific steps.
• Contact Haier support: They can offer further assistance, diagnose the issue based on your model, and advise on professional repair if necessary.
• Seek professional repair: If the cause seems complex, you're uncomfortable troubleshooting yourself, or suspect issues with internal components like the sensor, valve, or control board, a qualified technician can properly diagnose and fix the problem.

Additional information:

• The specific meaning and troubleshooting steps can vary depending on your Haier washing machine model.
• It's crucial to prioritize safety and avoid any actions that could damage the machine or void your warranty.
• If you're unsure about any step, consult your manual or seek professional help.

Remember: If you need further assistance, please prioritize safety and consult the appropriate resources:

• Haier support: They can offer further assistance, diagnose the issue based on your model, and advise on professional repair if necessary.
• Qualified technician: If the cause seems complex, you're uncomfortable troubleshooting yourself, or suspect issues with internal components, a qualified technician can properly diagnose and fix the problem.

I hope this information helps!