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TROUBLESHOOTING GUIDE
SYMPTOM TROUBLESHOOTING PROCEDURE / POSSIBLE REASON
Dehumidifier is not
draining properly.
• Check drain trap to be sure it is clear.
• Check drain line for continuous slope.
• Confirm trap is properly installed and primed.
Dehumidifier is producing
hot air.
• Reheat of outgoing air will cause a temperature increase across the dehumidifier,
which is normal.
• Unit will possibly run continuously initially. After unit has “dried” home,
dehumidifier will cycle, reducing load.
HVAC fan does not turn
on when CYCLE TIME dial is
in “TEST” mode.
• Make sure there is power to the HVAC equipment.
• Check the wiring diagram for the R, C, W, Y, GH, and GS at the HVAC equipment,
thermostat, and the dehumidifier.
• Make sure the sensor is connected to the Outdoor Temperature Sensor terminals
or the System Setup block is set to “TIMED” mode.
• Check the voltage across the R and C terminals at the dehumidifier. Voltage
should be 18 VAC minimum–30 VAC maximum.
• In “TEST” Mode, the HVAC fan will activate for 4 minutes, DO NOT LEAVE IN
TEST MODE AS DEHUMIDIFIER WILL NOT OPERATE.
Dehumidifier Blower is running,
but no airflow.
• Normally Open Damper was used instead of Normally Closed Damper in backflow.
Damper needs to be switched.
• Total HVAC system static is higher than 0.8” w.c.
Dehumidifier not adequately
dehumidifying.
• Unit will need time to “dry” materials in home before effectively changing RH.
• Too little airflow through dehumidifier.
• Total HVAC system static is higher than 0.8” w.c.
• Compressor is not turning on.
• System undercharged.
LED CODES
Green LED
Activity Status
ON Solid Compressor ON
Blinking 1 second ON, 1 second OFF Sampling
Blinking 1/2 second ON, 1/2 second OFF Defrosting
Test Mode
At the end of test mode (3 minutes of DEH Fan + 1 minute of Compressor ON & DEH Fan), the Red and Green LEDs will turn ON and OFF alternately until
the knob has been turned away from “TEST”.
Red LED
Activity Status
1 Blink every 5 seconds The RH sensor is having problems
2 Blink every 5 seconds The temperature sensor is opened or shorted
3 Blink every 5 seconds The Model 70 fails to respond after 3 consecutive attempts
4 Blink every 5 seconds The refrigerant charge has been detected as low
5 Blink every 5 seconds The temperature sensor is out of the operating range
6 Blink every 5 seconds The frost sensor is opened or shorted
7 Blink every 5 seconds The float switch has opened
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