Troubleshooting Fan Circuit - Aprilaire 1730A Troubleshooting Manual

Troubleshooting Fan Circuit

1. Turn the ON/OFF switch OFF and put a jumper between the REMOTE terminals.
2. Remove the dehumidifier cover.
3. Remove the electrical panel.
4. Check all electrical connections using wire color and printing on the control board to
verify proper placement and verify all connections are fully seated and secure.
a. Blue wire from fan to FAN BLU terminal on control board, A.
b. Black wire from fan to piggy back terminal on yellow jumper wire, to NTRL YEL
on control board, B.
c. The other end of the yellow jumper wire to one side of the 10µF fan capacitor, C.
d. Brown wire from fan to other side of the 10µF fan capacitor, D.
e. Green/Yellow wire from fan to electrical plate using screw and ring terminal, E.
5. Turn ON/OFF switch ON and measure the voltage between the FAN BLU and NTRL YEL
terminals.
a. The voltage should be between 103.5 – 126.5VAC. If the voltage is correct, move
to next step.
b. If the voltage is not within this range, replace the control board assembly (4923
or 5329, see parts list on pg. 15).
6. Disconnect the wires from the 10µF fan capacitor and measure the capacitance.
a. The capacitance should be between 9.5 – 10.5µF.
b. If the capacitance is not within this range, the capacitor is bad, replace the fan
capacitor (5399).
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