I have an E1 error

The E1 error code on a DeLonghi portable air conditioner typically indicates a probe or temperature sensor failure. It means the internal thermostat (or thermistor) that monitors the room temperature or evaporator coils is shorted, disconnected, or malfunctioning.

Step-by-Step Troubleshooting

Before purchasing replacement parts or calling for repairs, perform these basic troubleshooting steps:

1. Perform a Hard Reset

Sometimes the sensor registers a glitch and simply needs a fresh start.

• Turn the air conditioner off completely.
• Unplug the power cord from the wall outlet.
• Wait 5 to 10 minutes to let the internal capacitors discharge.
• Plug it back in and turn it on to see if the error is cleared.

2. Check and Clean the Filters

A heavily clogged filter limits airflow and can cause the system to freeze or overheat, triggering sensor errors.

• Remove the air filters at the back of the unit.
• Wash them with warm water and mild soap.
• Let them dry completely, put them back in, and reset the unit.

3. Fully Drain the Unit

If the internal condensation tray is completely full, it can trip float switches or error codes.

• Locate the drain plug at the bottom back of the unit.
• Place a shallow pan underneath and drain all the water completely before attempting a restart.

4. Check for Wiring Issues

If you are comfortable opening the portable AC housing (and the unit is unplugged), you can check if the sensor wires came loose from the circuit board.

For tips on accessing and fixing loose sensors or resetting your system:

How to Reset DeLonghi Portable Air Conditioner – Power Cycle & Error Code Reset Guide

Next Steps

If the error code remains after these steps, the internal temperature sensor (thermistor) or the control board is likely defective and needs to be replaced.

Depending on your model, you can check if replacement parts are available on the DeLonghi Spare Parts site. If your machine is still covered under the manufacturer's warranty, contact DeLonghi Customer Support to arrange for an authorized repair or a unit replacement.