Hisense Dehumidifier Error E4 — How to Fix It

What it means

Hisense dehumidifier error E4 means the temperature sensor (NTC thermistor) has failed or is reading out of range.
Unplug for 30 minutes and restart.
If E4 persists, the sensor requires professional replacement.

How to Fix It

Unplug and wait 30 minutes before restarting

Disconnect from the wall socket and leave unplugged for 30 minutes.
A temporary E4 caused by a sensor voltage spike or temperature extreme often clears after a full power reset.
Check the operating temperature

Hisense dehumidifiers have a rated operating range (typically 5°C–35°C / 41°F–95°F).
Operating outside this range can cause E4.
Move the unit to a room within the operating temperature range.
Allow a hot unit to cool down

If the unit was running in a very warm room or with restricted ventilation, the temperature sensor may have read too high.
Unplug and allow to cool in a ventilated area for 30 minutes.
Ensure adequate clearance around the unit

A dehumidifier placed in a corner or cupboard cannot dissipate heat properly, causing the temperature sensor to read abnormally high.
Ensure at least 30 cm of clear space on all sides.
Contact Hisense support for E4 replacement

The temperature sensor (NTC thermistor) is an internal component.
If E4 persists after a reset and adequate ventilation, the sensor has failed and requires replacement by an authorised technician.

Frequently Asked Questions

Hisense dehumidifier E4 in a hot summer room — expected?

Possibly.
If the room temperature exceeds 35°C (95°F), E4 can appear because the temperature sensor reading is outside the unit specification.
Move the unit to a cooler location or cool the room.

Hisense dehumidifier E4 then E2 alternating — cause?

Alternating sensor errors often indicate a failing control board or a wiring fault on the sensor connector rather than two separate sensor failures.
This requires inspection by a service technician.

Can I bypass the E4 temperature sensor fault to keep the dehumidifier running?

No.
The temperature sensor is a safety component — bypassing it could allow the unit to overheat without any protection.
Do not attempt to bypass or disconnect the sensor.