Aprilaire 1710A Troubleshooting Manual page 13

1. Level the unit front to back, and side to side. The unit may be installed with a slight slope
toward the drain outlet, but must be level side to side.
2. Turn the ON/OFF switch OFF then remove the front panel from the dehumidifier and examine
the insulation on the base to look for any signs of water inside the cabinet. Wipe up any water
that has collected in the base.
3. Clean the drain trap and clean or replace the drain tubing. The drain tubing must have a
continual downward slope to the drain.
IMPORTANT: If using ½" vinyl tubing for the drain line, ensure that there are no upward bends
in the tube that could act as a secondary trap – this will cause an air-lock that could prevent the
flow of water to the drain.
4. With the front panel still off, slowly pour a pint of water into the drain pan near the return
bends of the coils. After the running trap fills, the water should flow out the drain tube to the
drain.
5. Plug or raise the drain tube sufficiently high to prevent water from pouring out of the drain
tube. Slowly pour in an additional pint of water until the bottom of the drain pan is filled. Allow
15-20 minutes for the water to stand in the drain pan and look for any signs of leaks from the
drain pan and drain tube. Unplug the drain and allow the water to drain out.
6. Replace the front panel. Remove one filter door and slide out the filter about 6".
7. Switch the ON/OFF switch ON and turn the control knob to Test.
8. After the blower starts, slowly pour another pint of water into the drain pan just below the
bottom of the evaporator coil in the area where the filter has been pulled from. This will show
that the unit is draining with the highest negative pressure in the cabinet.
Blower Does Not Function
1. Make sure the outlet into which the dehumidifier is plugged has 120 VAC available.
2. Turn the ON/OFF switch OFF and the control knob to OFF.
3. Remove the front panel and disconnect the blue and yellow fan wires from the power board.
4. Inspect the large disk-like component (this is a varistor and it is usually blue or black in color) on
the power board right next to the fan terminals. If this component looks scorched or cracked,
replace the power board.
5. Turn the ON/OFF switch to ON and the control knob to TEST and after the green Status LED on
the control board starts to flash, measure the AC voltage at the fan terminals on the power
board. Use caution as this is line voltage.

If the FAN LED on the power board is lit and there is 120 VAC at the fan terminals,
replace the blower/motor assembly.

If the FAN LED on the power board is lit and there is 0 VAC, turn the ON/OFF switch
OFF and reconnect the fan wires to the power board. Turn the ON/OFF switch back ON
and disconnect the ribbon cable from the control board.
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