Troubleshooting - Carrier 73TCA005101B Start-Up And Service Instructions

SYMPTOM AND
PROBABLE CAUSE
COMPRESSOR DOES NOT RUN
Opening in Power Circuit
1. Control off
2. Blown fuse
3. Defective wiring
4. Defective service cord
5. Loose electrical connections
6. Faulty switches, thermostat, or fan
Compressor Power Supply Open
1. Loose leads at compressor terminals
2. Defective motor overload switch
3. Defective capacitor
4. Open compressor windings
5. Seized compressor
COMPRESSOR RUNS BUT CYCLES
Fan Operating Erratically
1. Loose lead at fan motor
2. Defective or burned out motor
3. Outdoor air restricted or recirculating
4. Overcharge or noncondensables in system
5. Restricted discharge line
6. Defective motor overload switch
7. Outdoor thermostat capillary touching suction tube
8. Outdoor coil freezing up due to low temperature
(outdoor thermostat may be set too low)
Cycles on Compressor Overload
1. Defective run capacitor
2. Defective compressor bearings or valves
3. Greatly restricted indoor air (iced indoor coil)
4. Low refrigerant charge
5. Indoor capilliary restricted
6. Liquid line restricted
7. Compressor hot
8. Weak or inconsistent line power
INSUFFICIENT COOLING
Cooling Air Not Adequate
1. Dirty filter or coil
2. Iced indoor coil (slightly low refrigerant charge)
3. Defective fan motor
Condenser Air Not Adequate
1. Outside air restricted
2. Dirty coil
3. Defective fan motor
Unit Undersized
Capilliary Restricted
Compressor Flooding
1. Unit overcharged
2. Defective electrical connections

TROUBLESHOOTING

PROBABLE REMEDY
1. Reset control button.
2. Replace fuse.
3. Replace wiring.
4. Replace service cord.
5. Tighten connections.
6. Replace defective component.
1. Tighten leads.
2. Replace switch.
3. Replace capacitor.
4. Replace compressor.
5. Replace compressor.
1. Tighten lead.
2. Repair or replace motor.
3. Check for dirty filter, proper clearances around unit —
remove any obstructions.
4. Reclaim refrigerant, evacuate and recharge system according to
nameplate specifications.
5. Check for obstruction in line; replace tubing if required.
6. Replace switch.
7. Move thermostat capillary away from suction tube.
8. Set outdoor thermostat higher.
1. Replace capacitor.
2. Replace compressor.
3. Defrost indoor coil
4. Add charge according to approved method.
5. Replace capillary.
6. Replace strainer.
7. Verify refrigerant charge.
8. Check line voltage at time of compressor start-up.
1. Clean as required.
2. Recharge.
3. Replace fan motor.
1. Check for obstructions and dirty filter. Remedy as required.
2. Clean coil.
3. Replace fan motor.
Re-evaluate unit for proper capacity.
Replace capillary.
1. Reclaim refrigerant, evacuate and recharge system according to
nameplate specifications.
2. Check connections per wiring diagrams.
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