Aprilaire · Dehumidifier error code

E5 / E6Thermistor failure (high temp E5 / low temp E6)

Cross-checked Power off, standard tools

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OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work.

Related diagnostic guides

Guide · Dehumidifier

Dehumidifier coils frosting or icing up

Light frost that comes and goes is normal: the defrost logic stops the compressor and runs the fan until it clears. Persistent ice means the room is too cold, airflow is restricted, the coil sensor has failed, or the refrigerant charge is low (sealed system, blocked).

6 steps ~40 minmoderate
Guide · Dehumidifier

Dehumidifier error codes: general approach (sensor, bucket, pump)

Most portable dehumidifiers share the same code groups: sensor faults (E1/E2/EH), bucket (P1/FL), pump (E5/P2) and refrigeration protection (E3/EC). Power-cycle and basic checks fix many; sensor faults need a part.

4 steps ~30 mineasy

More Aprilaire dehumidifier codes

Aprilaire · Dehumidifier

E1

Internal humidity/temperature sensor failure

Cross-checked

Aprilaire · Dehumidifier

E2

High refrigeration pressure / temperature

Cross-checked High-voltage / caution

Aprilaire · Dehumidifier

E3

Wall control (Model 76) communication lost

Cross-checked

Aprilaire · Dehumidifier

E4

Insufficient capacity

Cross-checked High-voltage / caution

Aprilaire · Dehumidifier

E7

Float switch open

Cross-checked

Aprilaire · Dehumidifier

E8

Inlet air out of range

Cross-checked
Aprilaire dehumidifier error E5 / E6: Thermistor failure (high temp E5 / low temp E6) · OnCall Tech