Carrier 48TJD008-014 Installation, Start-Up And Service Instructions Manual page 34

PROBLEM
Compressor and Power failure.
condenser fan
Fuse blown or circuit breaker tripped.
will not start.
Defective thermostat, contactor, transformer, or control
relay.
Insufficient line voltage.
Incorrect or faulty wiring.
Thermostat setting too high.
Compressor will not start Faulty wiring or loose connections in compressor circuit.
but condenser fan runs.
Compressor motor burned out, seized, or internal
overload open.
Defective run/start capacitor, overload, or start relay.
One leg of 3-phase power dead.
Compressor cycles Refrigerant overcharge or undercharge.
(other than normally
satisfying thermostat).
Defective compressor.
Insufficient line voltage.
Blocked condenser.
Defective run/start capacitor, overload, or start relay.
Defective thermostat.
Faulty condenser-fan motor or capacitor.
Restriction in refrigerant system.
Compressor makes Compressor rotating in wrong direction.
excessive noise
(48TJ014 scroll only)
Compressor operates Dirty air filter.
continuously.
Unit undersized for load.
Thermostat set too low.
Low refrigerant charge.
Leaking valves in compressor.
Air in system.
Condenser coil dirty or restricted.
Excessive head pressure. Dirty air filter.
Dirty condenser coil.
Refrigerant overcharged.
Air in system.
Condenser air restricted or air short-cycling.
Head pressure too low. Low refrigerant charge.
Compressor valves leaking.
Restriction in liquid tube.
Excessive suction High heat load.
pressure.
Compressor valves leaking.
Refrigerant overcharged.
Suction pressure too low. Dirty air filter.
Low refrigerant charge.
Metering device or low side restricted.
Insufficient evaporator airflow.
Temperature too low in conditioned area.
Field-installed filter drier restricted.
Compressor no. 2 Unit in economizer mode.
will not run.
Table 20 — Cooling Service Troubleshooting
CAUSE
34
REMEDY
Call power company.
Replace fuse or reset circuit breaker.
Replace component.
Determine cause and correct.
Check wiring diagram and rewire correctly.
Lower thermostat setting below room temperature.
Check wiring and repair or replace.
Determine cause. Replace compressor.
Determine cause and replace.
Replace fuse or reset circuit breaker.
Determine cause.
Recover refrigerant, evacuate system, and recharge
to nameplate.
Replace and determine cause.
Determine cause and correct.
Determine cause and correct.
Determine cause and replace.
Replace thermostat.
Replace.
Locate restriction and remove.
Reverse the 3-phase power leads as described
on page 23.
Replace filter.
Decrease load or increase unit size.
Reset thermostat.
Locate leak, repair, and recharge.
Replace compressor.
Recover refrigerant, evacuate system, and recharge.
Clean coil or remove restriction.
Replace filter.
Clean coil.
Remove excess refrigerant.
Recover refrigerant, evacuate system, and recharge.
Determine cause and correct.
Check for leaks, repair, and recharge.
Replace compressor.
Remove restriction.
Check for source and eliminate.
Replace compressor.
Recover excess refrigerant.
Replace filter.
Check for leaks, repair, and recharge.
Remove source of restriction.
Increase air quantity. Check filter and replace if
necessary.
Reset thermostat.
Replace.
Proper operation; no remedy necessary.