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Ultra-Aire SD12 Installer’s & Owner’s Manual
7.3 Troubleshooting
To turn the dehumidifier ON, make contact between yellow and blue
wires.
To turn the fan ON, make contact between yellow and green wires.
To power an HVAC accessory, connect the accessory to the white (or
red) wire and the yellow wire.
No fans or compressor running. Dehumidification is being called for.
No fan or ventilation call.
1. Dehumidifier unplugged or no power to outlet.
2. Humidity control set too high.
3. Loose connection in dehumidifier internal or control wiring.
4. Defective control transformer.
Compressor is not running. Condensing unit fan and dehumidifier fan
are running. Dehumidification is being called for.
1. Defective compressor run capacitor (Sec. 7.7).
2. Loose connection in compressor wiring.
3. Defective compressor overload (Sec. 7.7A).
4. Defective compressor (Sec. 7.7).
Compressor and condensing unit fan are not running. Dehumidifier
fan is running. Dehumidification is being called for. No fan or ventila-
tion call.
1. No power to condensing unit.
2. Defrost thermostat open.
3. Low pressure switch open.
4. Defective Cond. Relay.
5. Defective condensing unit fan motor.
6. Defective condensing unit fan motor capacitor.
7. Loose connection in condensing unit internal or control wiring.
Compressor and condensing unit fan cycle on and off. Dehumidifier
fan is running. Dehumidification is being called for. No fan or ventila-
tion call.
1. Low ambient temperature and/or humidity causing unit to cycle
through defrost mode.
2. Dirty air filter(s) or dehumidifier air flow restricted.
3. Defrost thermostat defective (Sec. 7.9).
4. Problem with condensing unit power supply.
5. Loose connection in condensing unit internal or control wiring.
Compressor cycles on and off. Dehumidifier fan and condensing unit
fan are running. Dehumidification is being called for.
1. Defective compressor overload (Sec. 7.7A).
2. Defective compressor (Sec. 7.7).
3. Loose connection in compressor wiring.
Condensing unit fan not running. Compressor cycles on and off.
Dehumidifier fan is running.
1. Defective condensing unit fan motor.
2. Defective condensing unit fan motor capacitor.
FOR HVAC INSTALLER ONLY
3. Loose connection in condensing unit fan wiring.
Dehumidifier fan is not running. Dehumidification or fan or ventilation
is being called for.
1. Dehumidifier unplugged or no power to outlet.
2. Loose connection in dehumidifier fan circuit.
3. Obstruction prevents fan impeller rotation.
4. Defective fan.
5. Defective fan relay.
6. Defective impeller run capacitor.
Low dehumidification capacity (evaporator is frosted continuously).
Dehumidification is being called for
1. Defrost thermostat loose or defective (Sec. 7.9).
2. Low refrigerant charge.
3. Dirty air filter(s) or dehumidifier air flow restricted.
4. Excessively restrictive ducting connected to unit.
5. Low ambient temperature dehumidifier operation.
6. Low humidity dehumidifier operation.
No ventilation. Ventilation is being called for.
1. Loose connection in ventilation control circuit.
2. Loose connection in damper power circuit.
3. Defective fresh air damper.
Dehumidifier removes some water, but not as much as expected.
1. Air temperature and/or humidity have dropped.
2. Humidity meter and/or thermometer used are out of calibration.
3. Unit has entered defrost cycle (Sec. 7.9).
4. Dehumidifier air filter dirty (Sec. 6.1 & 6.2).
5. Defective defrost thermostat (Sec 7.9).
6. Low refrigerant charge (Sec. 7.4).
7. Air leak such as loose cover or ducting leaks.
8. Defective compressor (Sec. 7.7).
9. Restrictive ducting (Sec. 3.8).
10. Optional Condensate Pump Safety Switch open (Sec 7.11).
11. Defective condensing unit fan motor.
12. Defective condensing unit fan motor capacitor.
13. Loose connection in condensing unit power or control wiring.
Unit Test to determine problem:
1. Detach remote control wiring connections from dehumidifier.
2. Connect the yellow and green pigtails from the main unit together;
only the impeller fan should run. Disconnect the wires.
3. Connect the yellow and blue pigtails from the main unit together;
the condensing unit and impeller fan should run.
4. If these tests work, the dehumidifer is working properly. You should
check the remote control and control wiring for problems next.
5. Remove the remote control cover from the remote control base and
detach the field installed control wiring. Remove the remote control
base from the wall and carry the remote control to the dehu-
midifier. Connect the blue, yellow, red, and green wires from the
dehumidifer directly to the corresponding terminals on the remote
control. Leave the white wire disconnected!
6. Turn on the fan switch; the dehumidifier impeller fan should run.
Turn off the fan switch.
7. Turn on the humidity control; the condensing unit and dehumidifier
impeller fan should run.
8. If these tests work, the problem is most likely in the field control
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