Dehumidifiers

Not collecting water, icing coils, pumps and error codes.

4 field manuals · 49 error codes · 11 diagnostic guides · 9 brands

Field service manuals

Field manual · Dehumidifier

Portable dehumidifier: field service manual

Portable 120 V compressor dehumidifiers (roughly 20-70 pint class) with bucket, gravity-drain and built-in pump options. Many brands share Midea, Gree or similar platforms, so code sets overlap; always confirm in the model manual.

8 components5 common failuresFrigidaire, GE, LG, hOmeLabs, Midea, Honeywell, Whynter

Field manual · Dehumidifier

Whole-house ducted dehumidifier (Aprilaire / Santa Fe class): electrical and airflow field manual

Plug-in 120 V whole-house dehumidifiers installed in basements, crawlspaces or attics and ducted stand-alone or to the HVAC system. Detailed values come from Aprilaire's 1830/1850/1870 troubleshooting manual; Santa Fe units follow the same principles but have their own documents. Electrical and airflow side only; the refrigeration circuit is out of scope.

8 components6 common failuresAprilaire, Santa Fe

Field manual · Dehumidifier

Frigidaire 50-pint dehumidifier (FFAD5033 and similar): quick sheet

Frigidaire portable dehumidifiers, especially the FFAD5033W1 50-pint and related FFAD / FGAC models (pump models show the PU code). Codes per Frigidaire's dehumidifier error code guide.

5 components3 common failuresFrigidaire

Field manual · Dehumidifier

hOmeLabs portable dehumidifiers (HME0200xx): quick sheet

hOmeLabs portable dehumidifiers sold online: HME020030N, HME020006N (marketed as '4500 sq ft') and HME020031N. Retailer listings disagree on pint ratings for the same model number, so read the rating label.

4 components3 common failureshOmeLabs

Diagnostic guides

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

Guide · Dehumidifier

Dehumidifier won't turn on (no display)

Check outlet, cord and any reset button first. Then internal fuse, transformer (on some whole-house units) and the control board.

4 steps ~45 minmoderate

Guide · Dehumidifier

Dehumidifier humidity reading wrong or runs nonstop

Compare against a known-good hygrometer. A dusty or failed humidity sensor, a set point too low for the space, or an undersized unit makes it run nonstop.

3 steps ~30 mineasy

Guide · Dehumidifier

Dehumidifier blows warm air or smells

A working dehumidifier always discharges slightly warmer air than it takes in; that is normal. Musty smell comes from a dirty bucket, filter or coil.

4 steps ~30 mineasy

Guide · Dehumidifier

Dehumidifier runs but collects little or no water

Rule out the easy causes first: setpoint already reached, room too cool, dirty filter, blocked airflow, or water going down a hose. Then confirm the compressor actually runs and the coil gets cold. A compressor that runs with a warm coil is a sealed-system failure: refer, do not repair.

6 steps ~45 minmoderate

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

Bucket full light (or P1/P2/Eb) stays on with an empty bucket

The bucket switch logic depends on a float and a small switch or magnet. A misseated or warped bucket, a float stuck with slime, or a failed float switch causes a false full signal. On units drained by hose, a loose hose connection can leak water into the bucket.

5 steps ~25 mineasy

Guide · Dehumidifier

Dehumidifier fan not running

Confirm it is a real fault: many units run the fan on after the compressor stops, and some stop the fan at setpoint. Then check for a jammed blade, a loose motor plug, the fan capacitor (on PSC motors) and the board output.

5 steps ~45 minmoderate

Guide · Dehumidifier

Continuous drain or built-in pump not draining

Gravity drains fail from uphill or sagging hoses, a hose end sitting in water, missing washers or loose fittings. Pump drains fail from an unseated pump hose, kinks, a clogged pump filter screen or a dead pump. Most fixes are hose routing and cleaning.

7 steps ~30 mineasy

Guide · Dehumidifier

Dehumidifier noisy or vibrating

Fan and compressor sound is normal. Abnormal noise usually comes from an unlevel unit, a loose panel or bucket, debris or ice hitting the fan, or a failing fan motor. Grinding on a brand-new unit suggests shipping damage.

5 steps ~30 mineasy

Guide · Dehumidifier

Dehumidifier shuts off or will not stay running

Many stops are by design: setpoint reached, bucket full or removed, defrost, compressor restart delay or a scheduled rest. Real faults are overload trips from heat or poor airflow, power problems (extension cords, tripped breakers) and failing controls.

5 steps ~30 mineasy

Aprilaire · 8 codes

Aprilaire · Dehumidifier

E1

Internal humidity/temperature sensor failure

The user interface is not getting a good signal from its on-board RH/temperature sensor board.

Cross-checked

Aprilaire · Dehumidifier

E2

High refrigeration pressure / temperature

The compressor discharge got too hot; the code clears by itself unless it repeats on several starts in a row.

Cross-checked High-voltage / caution

Aprilaire · Dehumidifier

E3

Wall control (Model 76) communication lost

The unit is configured for a remote wall control and cannot talk to it.

Cross-checked

Aprilaire · Dehumidifier

E4

Insufficient capacity

The coil (suction line) did not cool down enough after the compressor started, so the unit cannot reach its setpoint.

Cross-checked High-voltage / caution

Aprilaire · Dehumidifier

E5 / E6

Thermistor failure (high temp E5 / low temp E6)

The high-temperature or low-temperature (frost) thermistor reads open or shorted.

Cross-checked

Aprilaire · Dehumidifier

E7

Float switch open

The float switch input is open: water in the secondary pan, a faulty or wrong-type switch, or a missing jumper when no switch is used.

Cross-checked

Aprilaire · Dehumidifier

E8

Inlet air out of range

Incoming air is too cold (below about 50 F), too hot, or too dry (dew point below about 40 F) for the compressor to run. It clears by itself.

Cross-checked

Aprilaire · Dehumidifier

E9

Outdoor temperature sensor failure

The outdoor sensor signal is out of range; only shown when ventilation with temperature limits is enabled.

Cross-checked

Danby · 5 codes

Danby · Dehumidifier

E2

Room temperature sensor fault

The ambient thermistor failed.

Single source

Danby · Dehumidifier

E3

Coil temperature sensor fault

The evaporator coil sensor failed.

Single source

Danby · Dehumidifier

E4

Humidity sensor fault

The relative-humidity sensor failed.

Single source

Danby · Dehumidifier

EC

Display/main board communication error

Display and main board are not talking. (Some generic sources use EC for refrigerant problems on other brands.)

Single source

Danby · Dehumidifier

P2

Defrost / coil protection (status)

The unit pauses to defrost or protect the coil.

Single source

Frigidaire · 5 codes

Frigidaire · Dehumidifier

AS / ES / F1 / F2 / L1 / F5

Temperature or humidity sensor fault

The control lost a valid reading from the room humidity sensor or a temperature (coil or room) sensor.

Cross-checked

Frigidaire · Dehumidifier

E4 / C5

Electronic control failure

The control board detected an internal fault.

Cross-checked

Frigidaire · Dehumidifier

EC / F0

Sealed system failure

The control decided the refrigeration circuit is not cooling the coil as it should, which Frigidaire treats as a sealed-system failure.

Cross-checked Licensed pro only

Frigidaire · Dehumidifier

H3 / E5

Compressor overload protection

The compressor protector tripped because the unit ran too hot or could not shed heat.

Cross-checked

Frigidaire · Dehumidifier

PU

Pump-out failure

The pump did not empty the bucket within the time the control allows.

Cross-checked

GE · 5 codes

GE · Dehumidifier

88

Waiting for setpoint (not a fault)

Shown at power-up until a humidity setting is chosen.

Cross-checked

GE · Dehumidifier

E1

Humidity sensor error

The humidity sensor reading is faulty.

Cross-checked

GE · Dehumidifier

E2

Temperature sensor error

A temperature sensor reading is faulty.

Cross-checked

GE · Dehumidifier

P1 / E0 / E01

Pump not pumping in pump-out mode

The unit is set to pump out but the pump is not moving water.

Cross-checked

GE · Dehumidifier

P2

Bucket full

The bucket is full and must be emptied.

Cross-checked

Hisense · 4 codes

Hisense · Dehumidifier

E2

Control panel communication error

Display/keypad and main board are not communicating.

Single source

Hisense · Dehumidifier

E3

Room temperature sensor fault

Room sensor reads open or shorted.

Single source

Hisense · Dehumidifier

E4

Evaporator coil sensor fault

Coil sensor reads open or shorted.

Single source

Hisense · Dehumidifier

EC

Memory (EEPROM) error

The main board memory reports a fault.

Single source

Honeywell · 6 codes

Honeywell · Dehumidifier

E1 / E2

Temperature sensor fault

A temperature sensor input is faulty.

Cross-checked

Honeywell · Dehumidifier

E3

Refrigeration protection / high room temperature

The unit stopped to protect the refrigeration system, typically because the room is too hot or the unit was recently moved or tipped.

Cross-checked

Honeywell · Dehumidifier

E5

Pump or drainage fault

The pump or drain path is not clearing water.

Single source

Honeywell · Dehumidifier

EH

Humidity sensor fault

The humidity sensor reading is faulty.

Cross-checked

Honeywell · Dehumidifier

P1

Water tank pulled out / not seated

The tank is out, misseated or full.

Cross-checked

Honeywell · Dehumidifier

SA

Rest period (not a fault)

After about 24 hours of running the unit pauses for about an hour, then restarts by itself.

Single source

LG · 5 codes

LG · Dehumidifier

CH

Refrigerant leak detected

LG uses this code to report a refrigerant leak; there is no owner fix.

Cross-checked Licensed pro only

LG · Dehumidifier

CH 01 / CH 02 / CH 03

Electronic fault (humidistat or main board)

The control found a fault in the humidity sensing circuit or main board.

Cross-checked

LG · Dehumidifier

CH 24

Pressure switch error

The refrigeration pressure protection tripped, usually from poor airflow.

Cross-checked High-voltage / caution

LG · Dehumidifier

CH 67

Fan lock error

The control did not see the fan turning when commanded.

Cross-checked

LG · Dehumidifier

CL

Child lock on (not a fault)

The control panel is locked; buttons do nothing until it is released.

Cross-checked

Midea · 6 codes

Midea · Dehumidifier

AS

Humidity sensor error

The room humidity sensor reading is missing or out of range.

Cross-checked

Midea · Dehumidifier

E3

Unit malfunction

Midea lists this as a general malfunction with no further detail.

Single source

Midea · Dehumidifier

Eb

Bucket removed or misplaced (pump models)

On pump models the control sees the bucket missing or out of position.

Cross-checked

Midea · Dehumidifier

EC

Refrigerant leakage detection

The control concluded the coil is not getting cold, which it treats as a refrigerant loss.

Cross-checked Licensed pro only

Midea · Dehumidifier

ES

Evaporator tube temperature sensor error

The coil (evaporator tube) thermistor reading is missing or out of range; this sensor drives defrost control.

Cross-checked

Midea · Dehumidifier

P2

Bucket full or not seated

The float switch reports a full or missing bucket; the compressor stops.

Cross-checked

TCL · 5 codes

TCL · Dehumidifier

E1 / E2

Temperature sensor fault

A temperature sensor or the main board is reporting a fault.

Cross-checked

TCL · Dehumidifier

E3

Refrigeration protection / suspected low charge

The unit sees poor coil temperature change and cycles off; low refrigerant is possible.

Cross-checked Licensed pro only

TCL · Dehumidifier

E5

Pump sensor fault

The pump or its sensor reports a problem.

Single source

TCL · Dehumidifier

EH

Humidity sensor fault

The humidity sensor signal is invalid.

Cross-checked

TCL · Dehumidifier

P1

Bucket not in place

The bucket is missing or not seated on its switch.

Cross-checked

Official manufacturer support

We link to official documentation and never host it.

FrigidaireFrigidaire dehumidifier error code guideGEGE Appliances dehumidifier fault code articleGEGE Appliances dehumidifier model support (owner manuals by model)LGLG US dehumidifier error codesMideaMidea US dehumidifier FAQ and error codeshOmeLabshOmeLabs manualsHoneywellHoneywell portable dehumidifier supportWhynterWhynter product support (manuals by model)AprilaireAprilaire dehumidifier FAQ (codes and filter care)Santa FeSanta Fe (Therma-Stor) whole-house dehumidifiers