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Troubleshooting (continued)
Problem
The dehumidifier
fan runs but the
compressor does
not when the con-
trol is calling for
dehumidification.
Fan runs when
there is a call for
dehumidification
and the ventilation
control is OFF, but
the compressor
cycles on and off
too frequently.
Fan does not run
with ventilation
activated.
Compressor runs
briefly but cycles on
& off with humidity
control turned to
ON.
Evaporator
coil frosted
continuously, low
de-humidifying
capacity.
Unit not providing
ventilation.
Unit removes some
water, but not as
much as expected.
Unit Test to
determine problem:
DR65A3000 Dehumidification System 33-00297EFS—15
Troubleshooting Steps/Possible Causes of Issue
If there is a wire to "FAN" on the dehumidifier, remove that wire and see if the dehu-
midifier fan continues to run. If the fan shuts off, then whatever is controlling the
fan was calling for ventilation. That doesn't mean a control is calling for dehumidity.
Follow the steps from the first issue for further testing.
If there is no wire to the "FAN" terminal and the dehumidifier FAN is running but the
compressor is not, the dehumidifier may be running in defrost.
1. Low ambient temperature and/or humidity causing unit to cycle through defrost
mode.
2. Defective compressor overload.
3. Defective compressor.
4. Defrost thermostat defective.
5. Dirty air filter(s) or airflow restricted.
6. Low refrigerant charge, causing defrost control to cycle.
7. Bad connection in compressor circuit. Fan does not run with fan switch in either
position.
1. Loose connection in fan circuit.
2. Obstruction prevents fan rotation.
3. Defective fan.
4. Defective fan relay.
5. Defective fan capacitor.
1. Defrost thermostat loose or defective.
2. Low refrigerant charge.
3. Dirty air filter(s) or airflow restricted.
1. Check control wire connections (check connections at fresh air damper also).
2. Defective fresh air damper.
3. Dirty air intake. Clean outside intake hood.
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.
4. Dirty air filter.
5. Defective defrost thermostat.
6. Low refrigerant charge.
7. Air leak such as loose cover or ducting leaks.
8. Defective compressor.
9. Restrictive ducting.
10. Optional Condensate Pump Safety Switch open.
1. Detach field control wiring connections from main unit.
2. Connect the R and FAN contacts from the main unit together; only the impeller
fan should run. Disconnect the wires.
3. Connect the R and DHUM contacts from the main unit together; the compressor
and impeller fan should run.
4. If these tests work, the main unit is working properly. You should check the
control panel and field control wiring for problems next.
5. Remove the control panel from the mounting box and detach it from the field
installed control wiring. Connect the blue, yellow, and green wires from the
control panel directly to the corresponding colored pigtails on the main unit.
Leave the violet, white, and red wires disconnected!
6. Turn on the humidity control. The compressor and impeller fan should run.
7. If these tests work, the problem is most likely in the field control wiring.
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