E7 displayed, fan may run but compressor does not engage

Safety: Unplug the unit. The compressor and associated wiring carry mains voltage. Only proceed if you are competent with electrical testing.

Steps:

• 1. Access compressor terminals: Remove the rear or side panel to expose the compressor. Remove the terminal cover to access the start, run, and common pins.
• 2. Check overload protector: Inspect the thermal overload device clipped to the compressor. Ensure it is firmly attached and its terminals are not burnt. Test for continuity; replace if open when cool.
• 3. Test compressor windings: With all wires removed from the compressor, measure resistance between each pair of pins. You should see low but finite resistance values; any open circuit or direct short to the compressor shell indicates a failed compressor.
• 4. Inspect start relay/PTC: Many Ebac units use a PTC start device or relay on the compressor. Check for signs of overheating or cracking. Replace if suspect.
• 5. Verify supply to compressor: With the unit reassembled enough to run safely, and using extreme caution, verify that the control board is sending power to the compressor relay when dehumidification is demanded.
• 6. Replace components: Replace a faulty overload protector, start relay/PTC, or compressor as indicated by testing. Compressor replacement requires a qualified refrigeration technician.

Note: Do not bypass the overload protector or operate the compressor with damaged wiring.