Stadler Form Humidifiers & Dehumidifiers Error Codes

CL

Humidifier shows 'CL' or a cleaning icon and beeps periodically

Cleaning / Descaling Reminder

E1

Stadler Form dehumidifier displays E1 and stops dehumidifying

Room Temperature Sensor Fault

E2

Stadler Form dehumidifier shows E2 and will not run the compressor

Evaporator Coil Temperature Sensor Fault

E3

Dehumidifier displays E3 and shuts down shortly after starting

Humidity Sensor (RH Sensor) Failure

E4

Stadler Form dehumidifier shows E4 and will not start the compressor or fan

Refrigerant System / Defrost Protection Error

E5

Dehumidifier displays E5 and stops operation

Compressor Overload / Overheat Protection

E6

Stadler Form dehumidifier shows E6 and will not start

Internal Communication / Control Board Error

E7

Dehumidifier displays E7 and stops dehumidifying

Water Level Sensor / Float Switch Error (Dehumidifier Tank)

E8

Dehumidifier shows E8 and shuts down unexpectedly

Fan Motor / Fan Feedback Error

E9

Dehumidifier displays E9 and will not start

Power Supply / Voltage Error

Er

Humidifier shows 'Er' or 'Err' and will not operate

General Sensor / Control Error

F

Stadler Form humidifier displays an 'F' or filter icon and stops or reduces output

Filter / Wick Replacement Reminder

HI

Humidifier displays 'HI' and stops humidifying

High Humidity Limit Reached

Lo

Humidifier displays 'Lo' and does not produce mist

Low Water Level / Empty Tank

Symptom

Dehumidifier bucket fills too quickly or overflows when using continuous drain hose

Drainage System Blockage or Misrouting

Symptom

Dehumidifier coils freeze into a solid block of ice

Defrost Control or Airflow Problem

Symptom

Dehumidifier control buttons do not respond or require very hard presses

Worn Tact Switches or Contaminated Control Panel

Symptom

Dehumidifier display works but compressor never starts, even in very humid conditions

Compressor Start Circuit Failure

Symptom

Dehumidifier is excessively noisy or vibrates strongly during operation

Mechanical Vibration or Loose Components

Symptom

Dehumidifier runs briefly then shuts off with the bucket not full and no error code

Overheat or Thermal Protection Trip

Symptom

Dehumidifier runs but does not collect water in the tank

Refrigeration System Underperformance

Symptom

Humidifier base becomes unusually hot to the touch

Overheating Power Supply or Shorted Component

Symptom

Humidifier display and lights work but fan does not run

Fan Motor or Fan Driver Failure

Symptom

Humidifier display shows incorrect humidity compared to other hygrometers

Humidity Sensor Calibration Drift

Symptom

Humidifier emits a white dust on nearby furniture

Mineral Aerosolization from Hard Water

Symptom

Humidifier fan runs but there is no visible mist and no increase in humidity (evaporative models like Oskar, Karl)

Saturated or Clogged Evaporative Filter

Symptom

Humidifier has a persistent musty or moldy smell

Microbial Growth in Tank and Base

Symptom

Humidifier leaks water onto the table or floor

Tank or Base Seal Leakage

Symptom

Humidifier makes loud buzzing or rattling noise during operation

Fan Imbalance or Motor Wear

Symptom

Humidifier night mode or dimming function does not work

LED Control or Settings Logic Fault

Symptom

Humidifier powers on but produces no mist (ultrasonic models like Stadler Form Eva, Anton, or Mia)

Ultrasonic Transducer Failure

Symptom

Humidifier produces very weak mist output even at maximum setting

Restricted Water Flow or Partially Scaled Transducer

Symptom

Humidifier randomly shuts off and restarts or changes settings by itself

Control Panel or Touch Sensor Malfunction

Symptom

Humidifier turns off shortly after starting, indicator shows tank is empty even when full

Water Level Detection Failure (Humidifier)