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4.2 Troubleshooting
No dehumidification, neither hour meter display nor
compressor run and POWER button does not turn ON.
1. Unit unplugged or no power to outlet
2. Defective control board
3. Loose connection in internal wiring
No dehumidification, neither hour meter display nor
compressor run with POWER button ON.
1. Defective control board
2. Loose connection in internal wiring
Some dehumidification, air mover runs continuously but
compressor only runs sporadically.
1. Unit is in defrost cycle, DEFROST light on
2. Defrost thermistor defective
3. Loose connection in compressor circuit
4. Defective compressor overload
5. Defective compressor
6. Defective relay
7. Low refrigerant charge
No dehumidification, air mover runs but compressor does
not.
1. Bad connection in compressor circuit
2. Safety float switch closed, check pump reservoir
3. Defective compressor capacitor
4. Defective compressor overload
5. Defective compressor
6. Defective control board
7. Low refrigerant charge
Air mover does not run. Compressor runs briefly but
cycles on and off.
1. Loose connection in blower circuit
2. Obstruction prevents impeller rotation
3. Defective air mover
4. Defective control board.
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 filter dirty
5. Defective defrost thermistor
6. Low refrigerant charge
7. Air leak such as loose front cover
8. Defective compressor
9. Restrictive exhaust or inlet ducting
10. Thermistor connection detached from board
Unit runs but does not pump water.
1. Hose kinked or plugged
2. Pump motor defective
3. Pump check valve plugged
4. Bad connection in pump circuit
5. Hose disconnected internally
6. Defective control board
Unit pumps water automatically but not when PURGE
button is pushed.
1. Bad connection in PURGE button circuit
2. Defective control board
Evaporator coil frosted continuously, low dehumidifying
capacity.
1. Defrost thermistor defective
2. Low refrigerant charge
Compressor runs with POWER button OFF.
1. Defective relay
2. Defective control board
3. Upper housing not sealed to tower
Bypass door remains open.
1. Ambient temperature above set point.
2. Defective actuator.
3. Defective board.
4. Loose connection between board and actuator.
Bypass door remains closed.
1. Ambient temperature below set point.
2. Defective actuator.
3. Defective board.
4. Loose connection between board and actuator.
5. Loose temperature sensor connection.
4.3 Air Mover Replacement
The blower has a PSC motor and internal thermal overload
protection. If defective, the complete assembly must be
replaced.
1. Unplug power cord
2. Remove the front cover
3. Remove the 5 screws attaching blower inlet ring
