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Troubleshooting Fault Codes
The red Fault LED on the control board will blink to indicate a fault. The number of blinks determines
the fault that was detected – carefully count the number of blinks:
1 blink The control board is not receiving a good signal from the RH sensor on the sensor arm.
1. Turn off power to the dehumidifier using the ON/OFF switch and remove the sensor arm
(can be accessed through the filter door). Inspect the pins on the sensor arm, if they are
bent they will likely fail so replace the sensor arm.
2. Inspect the socket the sensor arm plugs into on the control board – if it wiggles with very
little effort, then one or more pins have likely broken from the control board and you will
need to replace the control board.
2 blinks The control board is not receiving a good signal from the thermistor on the sensor arm.
1. Turn off power to the dehumidifier using the ON/OFF switch and remove the sensor arm
(can be accessed through the filter door). Inspect the pins on the sensor arm, if they are
bent they will likely fail so replace the sensor arm.
2. Inspect the socket the sensor arm plugs into on the control board – if it wiggles with very
little effort, then one or more pins have likely broken from the control board and you will
need to replace the control board.
3 blinks A Model 70 or Model 76 control, wired to the Remote terminals of the control board, had
communication, but has now stopped communicating.
1. Use the color of the wire connected to the A, B, + and – (on the Model 76, the “+” and “-“
terminals are labeled “R/+” and “C/-“) terminals on both the base of the Model 70 or 76
and the dehumidifier control board to verify that they are wired correctly. Make sure the
terminal screws on both the control board and the Model 70 or 76 base are tight.
Note: The Model 76 has two “DH” terminals – these should not be used when it is wired
to the Remote terminals on the control board.
2. If connections are correct and secure, turn off the dehumidifier and remove the Model
70 or 76 control. Use a short section of 4-wire cable to reconnect the control to the
control board to see if there is a problem with the existing wire. Turn the dehumidifier
back on. If the “3 blinks” fault continues, the Model 70 or 76 must be replaced, if the
fault is gone, then the wire between the control and the dehumidifier must be replaced.
4 blinks The temperature of the suction line, as sensed by the Frost Sensor, has not dropped at least
5°F lower than the incoming air temperature in 20 minutes. The two reasons that this would
happen is that the compressor is not running, or the refrigeration system is not operating
properly.
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