Dehumidifier shows E5 and will not start the compressor.

Safety: Unplug the unit and wait several minutes before touching components near the compressor. Capacitors may hold charge; avoid contact with capacitor terminals.

Steps:

• Check supply voltage: Plug the unit into a known-good outlet (no extension leads). Low voltage can trigger current protection.
• Access compressor compartment: Remove the rear or side panel to expose the compressor and electrical box on its side.
• Inspect wiring: Look for burnt connectors, melted insulation, or loose spade terminals on the compressor, overload protector, and start relay/PTC.
• Test the overload and PTC (if equipped): With a multimeter, check continuity through the overload protector (should be closed at room temp). The PTC relay should not be shorted. Replace any visibly damaged or failed components.
• Replace start components if suspect: Install a compatible Challenge compressor start relay/PTC and/or compressor overload protector for your model, matching the original ratings.
• Reassemble and test: Refit covers, plug in, and run the unit. If E5 persists and the compressor hums then trips, the compressor itself may be mechanically seized.

Warning: Compressor replacement and sealed system work must be done by a qualified refrigeration technician.