Broan B98DHV Installation & Operation Instructions

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Installation & Operation Instructions 800.558.1711

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.

Dehumidication

is being called for.

Compressor is

not running.

Dehumidication

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.

Dehumidication 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. Dehumidier 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.

6. Open circuit between

FLOAT terminals.

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Broan B98DHV 98 Pint Dehumidifier

Installation & Operation Instructions - Page 16