Compressor cycles on and of. Dehumidifcation is being called for. No fan call.
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 flter(s) or air fow restricted.
Fan is not running. Dehumidifcation or fan is being called for.
1. Loose connection in fan circuit.
2. Obstruction prevents fan impeller rotation.
3. Defective fan.
4. Defective fan relay.
Low dehumidifcation capacity (evaporator is frosted continuously). Dehumidifcation is being called for
1. Defrost thermostat loose or defective.
2. Low refrigerant charge.
3. Dirty air flter(s) or air fow restricted.
4. Excessively restrictive ducting connected to unit.
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.
Unit 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.
4. Air flter dirty.
5. Defective defrost thermostat.
6. Low refrigerant charge.
7. Air leak (eg. loose cover or ducting leaks).
8. Defective compressor.
9. Restrictive ducting.
10. Optional Condensate Pump Safety Switch open.
11. Unit is in (Lo)w fan mode
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