5
www.jondon.com
Toll-Free 1-800-556-6366
Some dehumidification, air mover runs continuously but
compressor only runs sporadically.
1. Unit is in defrost cycle, DEFROST light on
2. Defrost thermistor defective or loose
3. Loose connection in compressor circuit
4. Defective compressor overload
5. Defective compressor
6. Defective relay
7. Upper housing is not sealed to lower housing
8. Check dehumidistat for proper setting
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
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
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
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 (pump phase)
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 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.
1. Defective relay
2. Defective control board
3. Upper housing not sealed to tower
No hour meter display when the HOURS button is pressed.
1. Battery charge is low. Replace battery
2. Defective control board
4.4 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 four screws attaching the blower to the
mounting support
4. Disconnect the blower leads
5. Reassemble the new blower using the above procedure
in reverse
4.5 Thermistor Replacement
The defrost thermistor is attached to the refrigerant suction
line between the accumulator and the evaporator.
To replace thermistor:
1. Unplug the dehumidifier
2. Remove the front cover
3. Remove aluminum tape
4. Remove control panel
5. Unthread thermistor from condenser grommet
6. Detach thermistor from control board jumper, J1
7. Reassemble thermistor and dehumidifier using the above
procedure in reverse
4.6 Condensate Pump Replacement
The internal condensate pump removes water that collects in
the reservoir.
To replace the condensate pump:
1. Unplug the unit
2. Remove the front cover
3. Unplug the pump wires from the wire harness
