TROUBLESHOOTING

Electrical Shock Hazard

Disconnect power before servicing.

Replace all parts and panels before operating.

Failure to do so can result in death or electrical shock.

PROBLEM

 

CAUSE

 

CORRECTION

 

 

 

 

 

 

 

1.

Unit not turned “ON” or not set dry

1.

Set control to “CONTINUOUS.” This will allow the fan and com-

 

 

enough.

 

pressor to run regardless of the ambient humidity.

 

 

 

 

 

 

 

2.

No power to unit.

2a.

Power supply cord not plugged in. Plug in cord.

 

 

 

2b.

Unit plugged into outlet that has no power to it (blown fuse or

 

 

 

 

tripped circuit breaker). Advise customer to correct this problem

Unit will not run - no fan

 

 

 

with a qualified electrician.

 

 

 

 

 

and no compressor.

3.

Bucket In/Water Level switch open.

3a.

Empty bucket.

 

 

 

3b.

Make sure bucket is installed properly.

 

 

 

3c. Check switch. Replace, if defective.

 

 

 

 

 

 

 

4.

Defective power supply cord or loose

4.

Check wiring and supply cord. Repair or replace defective parts.

 

 

wiring in unit.

 

 

 

 

 

 

 

 

 

 

5.

Defective humidistat.

5.

Run diagnostics. Replace electronic control, if needed.

 

 

 

 

 

 

 

1.

Mechanical Models: Deicer thermostat

1a.

Let evaporator coil thaw. Normal if coil is frosted over.

 

 

open.

1b.

Replace deicer thermostat if it is still open after coil thaws and

Fan runs - compressor

 

 

 

warmed up.

2.

Electronic Models: Thermistor out of

2a.

Unit in defrost mode. Raise room temperature.

 

does not run.

 

range or evaporator is less than 30°F.

2b.

Run diagnostics. Replace electronic control, if needed.

 

 

 

 

 

 

 

3.

Compressor overload or relay defective.

3.

Check both components and replace, if defective.

 

 

 

 

 

 

 

4.

Compressor windings open.

4.

Check continuity and replace if one or both windings are open.

 

 

 

 

 

 

Fan does not run -

1.

Fan motor not getting power.

1.

Check wiring. Repair or replace, as necessary.

 

 

 

 

 

2.

Fan motor defective.

2.

Replace fan motor.

compressor runs.

 

 

 

 

 

3.

Fan blade jammed.

3.

Remove obstruction. Replace if fan blade is damaged.

 

 

 

 

 

 

 

Fan and compressor run -

1.

Ambient room temperature is too cold

1.

Turn unit off until room temperature reaches 65°F (18.3°C).

evaporator coil frosted over.

 

(non deicer model).

 

 

 

 

 

 

 

 

 

Fan and compressor run -

1.

Unit out of refrigerant.

1.

Follow sweep charge procedure to find and repair leaks.

 

 

 

 

 

2.

Humidity too low.

2.

Turn unit off until humidity goes up.

no dehumidification.

 

 

 

 

 

3.

Dirty evaporator or blocked air filter.

3.

Clean air filter and/or evaporator.

 

 

 

 

 

 

 

 

1.

Area is not sealed off - open doors and/

1.

Isolate area by closing doors and windows.

 

 

or windows.

 

 

 

 

 

 

 

 

 

Unit runs - insufficient

2.

Grilles obstructed.

2.

Move unit or items so grilles are not blocked.

 

 

 

 

 

3.

Dirty evaporator or blocked air filter.

3.

Clean air filter and/or evaporator.

dehumidification.

 

 

 

 

 

4.

Low refrigerant charge.

4.

Follow sweep charge procedure to find and repair leaks.

 

 

 

 

 

 

 

 

5.

Unit too small for area being

5.

Close off into smaller area.

 

 

dehumidified.

 

 

 

 

 

 

 

 

 

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Whirlpool AD50USS, AD50DSS, AD70USS, AD35DSS, AD25BSS, AD35USS manual Troubleshooting, Problem Cause Correction