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No dehumidification, air mover runs but compressor does
not.
. 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
Air mover does not run. Compressor runs briefly but cycles
on and off.
. Loose connection in blower circuit
2. Obstruction prevents impeller rotation
3. Defective air mover
Unit removes some water but not as much as expected.
. 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 cover
8. Defective compressor
9. Restrictive exhaust or inlet ducting
Unit runs but does not pump water.
. 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 (pump phase)
Unit pumps water automatically but not when PURGE
button is pushed.
. Bad connection in PURGE button circuit
2. Defective control board
Evaporator coil frosted continuously, low dehumidifying
capacity.
. Defrost thermistor loose or defective
2. Low refrigerant charge
3. Dirty air filter or restricted air flow
4. Upper housing is not sealed to lower housing
Compressor runs with POWER button OFF.
. Defective relay
2. Defective control board
3. Upper housing not sealed to tower
No hour meter display when the HOURS button is pressed.
. Unit is plugged in
2. Battery charge is low. Replace battery
3. Defective control board
5.3 Air Mover
The motorized impeller has a PSC motor and internal
thermal overload protection. If defective, the complete
assembly must be replaced.
. Unplug power cord
2. Remove the four screws attaching the bottom plate to
the lower housing
3. Disconnect the impeller leads
4. Remove the four screws holding the impeller to the
bottom plate
5. Reassemble the new impeller using the above
procedure in reverse
5.4 Thermistor
The defrost thermistor is
attached to the refrigerant
suction line between
the accumulator and the
evaporator.
To replace thermistor:
. Unplug the dehumidifier
2. Remove the front housing
3. Cut cable ties and remove aluminum tape.
4. Remove control panel
5. Unthread thermistor from control housing grommet
6. Detach thermistor from control board jumper, J
7. Reassemble thermistor and dehumidifier using the
above procedure in reverse
Figure 4: Thermistor attached
to the refrigerant line.
Figure 5: Picture of pump and reservoir.
