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4.2 Troubleshooting
No dehumidification, neither blower nor compressor run
and power switch does not light when ON.
1. Unit unplugged or no power to outlet.
2. Power switch defective.
3. Loose connection in internal wiring.
No dehumidification, neither blower nor compressor run
with power switch ON and lit.
1. Low pressure control open.
2. Power switch defective.
3. Loose connection in internal wiring.
4. Check thermostat setting.
Some dehumidification, blower runs continuously but
compressor only runs sporadically.
1. Unit is in defrost cycle.
2. Defrost thermostat defective or loose.
3. Loose connection in compressor circuit.
4. Defective compressor overload.
5. Defective compressor.
6. Defective relay.
No dehumidification, blower runs but compressor does not.
1. Bad connection in compressor circuit.
2. Pump safety switch closed.
3. Defective compressor capacitor.
4. Defective compressor overload.
5. Defective compressor.
6. Defective relay.
Blower does not run. Compressor runs briefly but cycles on
and off.
1. Loose connection in blower circuit.
2. Obstruction prevents impeller rotation.
3. Defective blower.
Figure 5: Refrigeration system
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. Defrost timer incorrectly set for conditions.
6. Defective defrost thermostat.
7. Low refrigerant charge.
8. Air leak such as loose cover.
9. Defective compressor.
10. Restrictive exhaust ducting.
Unit runs but does not pump water.
1. Hose kinked or plugged.
2. Pump motor or float switch defective.
3. Pump check valve plugged.
4. Bad connection in pump circuit.
5. Hose disconnected internally.
Unit pumps water automatically but not when purge switch
is pushed.
1. Bad connection in purge switch circuit.
2. Defective purge switch.
Evaporator coil frosted continuously, low dehumidifying
capacity.
1. Defrost thermostat loose or defective.
2. Defrost timer incorrectly set or defective.
3. Low refrigerant charge.
4. Dirty air filter or air flow restricted.
Compressor runs with power switch OFF.
1. Defective relay.
2. Defective power switch.
4.3 Blower Replacement
The motorized impeller has a PSC motor and internal
thermal overload protection. If defective, the complete
assembly must be replaced.
1. Unplug the power cord.
2. Remove the top and cabinet front (6 screws).
3. Disconnect the impeller leads.
4. Remove four screws holding the impeller to the
impeller brackets.
5. Remove impeller. Use care to avoid hooking wiring,
tubing or electrical components.
6. Reassemble with the new impeller in the above
procedure reversed.
