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Quest 185 Cool
Installation, Operation and Maintenance Instructions
23
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Troubleshooting (Continued)
Symptom
Possible Reason
Troubleshooting Procedure
Troubleshooting Procedure for Performance
Related Issues
This method of diagnosis is used to function check the
internal components in the dehumidifier. This is to be
used when a performance issue is suspected.
1. Set the humidity controller all the way to the most
humid setting or off position – Did the unit shut off?
2. If yes, turn the fan setting to the ON position – does
the fan start?
3. If fan starts, leave in the fan ON position and set the
humidity all the way to driest setting. May have to wait
5 minutes for the compressor to start.
4. Listen for a distinct buzzing/humming sound of a com-
pressor starting up – do you hear this noise?
5. If compressor is running and continues to run, after
about 15 minutes you should feel a slight increase in air
temperature being discharged out of the discharge air
side of the unit.
6. If so, depending on your environmental
conditions (temp/Rh%), you should see some water
production out of the hose within
30 minutes or so. (Note: If the room
temperature is 55 degrees or below and/or
in area of low relative humidity, the
dehumidifier will produce little to no water.)
7. Collecting the water removed in a 24 hour period will
give a measurement of performance.
WARNING!
ELECTRICAL SHOCK HAZARD:
ELECTRICAL POWER MUST BE PRESENT
TO PERFORM SOME TESTS. THESE TESTS
SHOULD BE PERFORMED BY A QUALIFIED
SERVICE PERSON.
Fan is not running.
Dehumidification
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.
Low dehumidification
capacity (evaporator is
frosted
continuously).
Dehumidification is be-
ing called for.
1. Defrost thermostat loose or
defective.
2. Low refrigerant charge.
3. Dirty air filter(s) or air flow
restricted.
4. Excessively restrictive ducting
connected to unit.
No ventilation. Ven-
tilation is being called
for.
1. Loose connection in
ventilation control circuit.
2. Loose connection in damper
power circuit.
3. Defective fresh air damper.
Dehumidifier
removes some
water, but not as much
as expected.
1. Air temperature and/or humid-
ity have dropped.
2. Humidity meter and or ther-
mometer used are
out of calibration.
3. Unit has entered defrost cycle.
4. Dirty air filter(s) or air flow is
restriced.
5. Defective defrost
thermostat.
6. Low refrigerant charge.
7. Air leak such as loose cover or
ducting leaks.
8. Defective compressor.
9. Restrictive ducting.
SERVICE
