Possible causes or Err4:

• Water heater error: 
  • This seems to be the most common interpretation for Err4 in Haier washing machines. It indicates an issue with heating the water during the wash cycle. This could be due to a faulty heating element, water flow problems, or a malfunctioning sensor.
• Water level sensor error: 
  • In some models, Err4 might signify a problem with the sensor that detects the water level in the machine. This could lead to the machine not filling properly or overfilling, causing the error.
• Other potential causes: 
  • Less common possibilities include issues with the control board, thermistor (temperature sensor), or pressure sensor.

Troubleshooting the Err4 error code in Haier Washing Machine

Disclaimer: Before attempting any troubleshooting, always unplug the washing machine for safety reasons. It's also recommended to consult your user manual for specific instructions related to your model and the Err4 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 water supply: 
   • Ensure the water taps are fully open and there are no restrictions in the water lines.
3. Select a lower water temperature: 
   • If the error appears only at the end of the cycle, try selecting a cooler wash setting in the next cycle. This can help rule out a water heater issue.
4. Clean the drain filter: 
   • A clogged drain filter can affect water flow and potentially trigger the Err4 code. Clean the filter according to your manual's instructions.
5. Check for error codes: 
   • Some models might display additional error codes alongside the Err4, which can provide more specific information about the problem. Consult your manual for their meaning.

If the problem persists:

• 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 or you're not comfortable troubleshooting yourself, 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.

I hope this information helps! If you need further assistance, please prioritize safety and consult the appropriate resources.