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December 22, 2020
GENERAL TROUBLE SHOOTING GUIDE FOR CERTIFIED TECHNICIANS
The following guide deals with common performance issues related to the entire line of cabinets, such as
electrical problems of the unit, plugged cap tubes, moisture, etc.
Problem
Probable Cause
Remedy
Condensing unit will not start
and fan will not start
1. Power cord is disconnected or no
voltage at source
1
2. Blown fuse or tripped circuit breaker
1
3. Control stuck in “On” position
4. Loose wire on temperature control
1. Verify power cord is OK and check
voltage at outlet with a voltmeter.
Voltage must be +/- 10% of name plate
voltage
1
2. Replace fuse or reset circuit breaker.
Check power at outlet with voltmeter. If
circuit is overloaded, reduce load or
use another circuit
1
3. Replace
4. Check/tighten all connections
Compressor Unit will not start,
but fan motor starts
1. Loose wire on compressor connections
2. Low voltag
e
1
3. Start Capacitor bad
4. Relay bad
5. Defective compressor
1. Check and tighten all compressor
connections
2. Measure voltage at compressor with a
voltmeter. Voltage must be +/- 10% of
name plate voltage
1
3. Replace
4. Replace
5. Replace
Condensing Unit starts but
short cycles
1. Overload defective
2. Defective thermostat
3. Check capillary tube
4. Low voltage
5. Defect in compressor winding
6. Loose connections on control or
compressor housing
7. Low refrigerant leve
l
1. Replace
2. Replace
3. Replace capillary tube and filter drier
4. Correct problem
5. Replace Compressor
6. Check and tighten all electrical
connections
7. Check pressure/leak and, as
necessary, charge with the proper
amount of refrigerant as shown on
name plat
e
2
Compressor operates
continuously, too warm
1. Low refrigerant leve
l
2. Poor ventilation
3. Room temperature is too warm
4. Excessive frost build-up
5. Plugged condenser
6. Fan motor not running or too
noisy
7.
Fan
blade unbalanced or loose
8. Dirty condenser
9. Weak compressor
10. Check Capillary Tube
1. Check for leaks and, as necessary,
charge with the proper amount of
refrigerant as shown on name plat
e
2
2. Ensure 3 – 6” clearance from walls for
air flow
3. Adjust room temperature to achieve 75
degrees (F) and 55% RH
4. Defrost and clean cabinet
5. Clean Condenser
6. Replace fan motor
7. Replace
8. Clean
9. Replace
10. Replace Capillary Tube and Filter Drier
Compressor operates
continuously, too cold
1. Thermostat controller set incorrectly
2. Thermostat stuck in closed position
3. A short in the wire harness or
compressor cord
4. Thermostat improperly located
1. Follow Temperature Adjustment
guidelines
2. Check pressure and, as necessary,
charge with the proper amount of
refrigerant as shown on name plate
2
3. Replace
4. Call C. Nelson
Wide temperature variations
1. Improper refrigerant leve
l
2
2. Defective Thermostat
1.
Check pressure and, as necessary,
charge with the proper amount of
refrigerant as shown on name
plate
2
2. Replace
