Aprilaire 1710A Troubleshooting Manual page 3

1. Turn the ON/OFF switch OFF, and turn the control knob to OFF to reset the fault.
2. Turn the ON/OFF switch back ON and after 10 seconds, turn the control knob to Test.
The dehumidifier blower will turn on for 3 minutes with the green Status LED blinking,
and then the compressor will turn on with the green Status LED staying on continuously.
You should be able to hear the compressor kick in.
If the compressor doesn't start (go to step 3), there is an electrical issue to address. If
the compressor does start (go to step 4), then you will need to verify that the
refrigeration system is working properly.
3. If the compressor doesn't start
a. Turn the control knob to OFF and the ON/OFF switch to OFF.
b. Remove the front panel of the dehumidifier.
c. Verify that the brown and orange wires are connected to the power board. Verify
that two brown wires are connected to one pole of the run capacitor and one red
wire is connected to the other pole. Give each wire a light tug to make sure all
connections are sound.
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d. Turn the ON/OFF switch back ON. With the front panel still off, stay clear of the
blower motor and turn the control knob to Test. When the green Status LED on the
control board turns on continuously, you should a hear the "click" of the
compressor relay and see that the red LED on the power board that is labeled
"COMP" is on. There should be two red LED's lit on the power board: the FAN LED
and the COMP LED.
If the COMP LED is not on, turn the ON/OFF switch OFF and disconnect the two
black high temperature switch wires from the power board. Verify continuity
(resistance near zero) across the two high temperature switch wires. If there is no
continuity, the high temperature switch will need to be replaced. If there is
continuity, reconnect the switch wires and turn the ON/OFF switch back ON.
For older power boards, the high temperature switch and ribbon cable are connected
to a daughter board that attaches to the power board. Disconnect the high
temperature switch wires and verify that the daughter board is securely attached to
the power board and that the socket on the daughter board is not loose. If the
socket is loose replace the daughter board.
3 | P a g e
If any of the wires were disconnected, place the front panel back on (do not
secure with screws yet), turn the ON/OFF switch ON and turn the control knob
to Test to verify the compressor starts. If it starts, go to step 4 to verify the
performance of the refrigeration system before leaving. If it still does not start,
continue to the next step (d.).
If none were disconnected, continue to the next step (d.).