Trouble Shooting Charts - Hussmann MD Series Installation & Operation Manual

TROUBLE SHOOTING CHARTS

TROUBLE
Compressor will not start no
noise
Compressor will not start, cuts
out on overload
Warm storage temperature
Compressor runs
continuously. Product too
warm
Compressor runs
continuously. Product too cold
PROBABLE CAUSE
1. Power disconnected
2. Blown fuse or breaker
3. Defective or broken wiring
4. Defective overload
5. Defective temperature
control
1. Low voltage
2. Defective compressor
3. Defective relay
4. Restriction (pinched cap
tube)
5. Restriction (moisture)
6. Condenser blocked with
dust and dirt
7. Defective condenser fan
motor
1. Short of refrigerant
2. Cabinet location too warm
3. Refrigerant overcharge
4. Low voltage, compressor
cycling on overload
1. Short of refrigerant
2. Inefficient compressor
1. Defective control
2. Short on refrigerant
SOLUTION
1. Check service cord or
wiring connection.
2. Replace fuse or reset
breaker
3. Repair or replace
4. Replace
5. Replace
1. Check voltages at cabinet,
should not be more than 5%
below rating.
2. Replace
3. Replace
4. Repair or replace
5. Leak check, replace drier
evacuate and recharge
6. Clean condenser
7. Replace
1. Leak check, replace drier
evacuate and recharge
2. Move to cooler location or
correct excessive heat source.
3. Purge system, evacuate and
recharge.
4. Check voltage at
compressor should not be
more than 5% below rating
1. Leak check, replace drier,
evacuate and recharge
2. Replace
1. Replace
2. Leak check, replace drier,
evacuate and recharge.
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