Troubleshooting the EH0E Error on a MRCOOL DIY Cassette System

If your MRCOOL DIY Cassette system displays an EH0E error, it typically points to an issue with the water level switch. This switch monitors the water level in the drain pan, and when it detects overflow, it triggers the error. Here's how to troubleshoot and resolve the issue.

Troubleshooting Steps:

1. Check for a Clogged Drain Line
   A blockage in the drain line can prevent proper drainage, causing the error. Clear the line using a wet/dry vacuum or water flush.

2. Inspect the Drain Pan
   A damaged or rusty drain pan can lead to water flow issues. Check for signs of damage and replace if necessary.

3. Ensure the Unit is Level
   If the cassette isn’t level, water won’t drain correctly. Use a level to check the alignment and adjust as needed.

4. Test the Float Switch
   A malfunctioning float switch can trigger the error. Inspect the float to ensure it moves freely and isn’t stuck in the “up” position.

5. Verify Electrical Connections
   Loose or improper connections can also cause issues. Ensure all wiring to the water level switch is secure.