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15
800.558.1711 Installation & Operation Instructions
SERVICE
Symptom Possible Reason Troubleshooting Procedure
CAUTION!CAUTION!
TROUBLESHOOTING SHOULD BE PERFORMED BY A QUALIFIED HVAC TECHNICIAN.
Troubleshooting
Troubleshooting Procedure for Control
Related Issues
This method of diagnosis will test the 3 main
components of the control circuit individually to
indicate any potential problems. This is to be used
when the control will not activate the main unit.
1. Detach eld control wiring connections from
the terminals on the main unit.
2. Connect the 24V and FAN terminals
together; only the fan should run.
Disconnect the terminals.
3. Connect the 24V and DEHU terminals
together; fan and compressor should run.
Disconnect the terminals.
4. If this test works, the main unit is working
correctly from a control standpoint.
5. Reconnect eld control wiring to the terminals
on the main unit.
6. Remove the control panel cover and detach
the eld wiring from the control connections.
7. Connect the 24V and FAN terminals together;
only the fan should run. Disconnect the terminals.
8. Connect the 24V and DEHU terminals
together; fan and compressor should run.
Disconnect the terminals.
9. If this test works, then the eld control wiring
is ok.
10. If the problem persists, then the control is
most likely faulty.
WARNING!WARNING!
ELECTRICAL SHOCK HAZARD:
ELECTRICAL POWER MUST BE PRESENT
TO PERFORM SOME TESTS. THESE TESTS
SHOULD BE PERFORMED BY A QUALIFIED
SERVICE PERSON.
Neither fan nor
compressor
running.
Dehumidication
is being called for.
Compressor is
not running.
Dehumidication
is being called for.
Fan is running.
1. Defective compressor
run capacitor.
2. Loose connection in
compressor circuit.
3. Defective compressor
overload.
4. Defective compressor.
5. Defrost thermostat open.
Compressor
cycles on and o.
Dehumidication is
being called for.
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 lter(s) or air
ow restricted.
6. Defective fan or relay.
1. Dehumidier unplugged
or no power to outlet.
2. Humidity control set
too high.
3. Loose connection in
internal or control wiring.
4. Defective compressor
relay.
5. Defective control
transformer.
Fan is not running.
Dehumidication
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.
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