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Table 10 – Troubleshooting Chart
SYMPTOM CAUSE REMEDY
Compressor a nd condenser fan will not start.
Power failure Call power company
Fuse blown or circuit breaker tripped Replace fuse or reset circuit b reaker
Defective contactor, transformer, or high--pressure,
loss --of--charge or low--pressureswitch
Replace component
Insufficient line voltage Determine cause and correct
Incorrect or faulty wiring Check wiring diagram and rewire correctly
Thermostat setting toohigh
Lower thermostat setting below room tempera-
ture
Compressor will not start but condenser fan
runs
Faulty wiring or loose connections in compressor cir-
cuit
Check wiring andrepair or replace
Compressor motor burned out, seized, or Determine cause
internal overload open Replace compressor
Defective run/start capacitor, overload, start relay Determine cause and replace
One leg of 3--phase power dead
Replace fuse or reset circuit b reaker
Determine cause
Three--phase scroll compressor
Scroll compressor is rotating in the wrong direction
Correct the direction of rotation by reversing the
3--phase power leads to the unit.
makes excessive noise, and there may be a
low pressure differential.
Compressor cycles (other than normally sat-
isfying thermostat).
Refrigerant overcharge or undercharge
Recover refrigerant, evacuatesystem,and re-
charge tocapacities shown on rating plate
Defective compressor Replace and determine cause
Insufficient line voltage Determine cause and correct
Blocked condenser Determine cause and correct
Defective run/start capacitor, overload or start relay Determine cause and replace
Defective thermostat Replace thermostat
Faulty condenser--fan motor or capacitor Replace
Restriction in refrigerant system Locate restriction and remove
Compressor operates continuously
Dirty air filter Replace filter
Unit undersized for load Decrease load or increase unit size
Thermostat set too low Reset thermostat
Low refrigerant charge Locate leak, repair, and recharge
Mechanical damage in compressor Replace compressor
Air in system
Recover refrigerant, evacuatesystem,and re-
charge
Condenser coil dirty or restricted Cleancoilor removerestriction
Excessive head pressure
Dirty air filter Replace filter
Dirty condenser coil Clean coil
Refrigerant overcharged Recover excess refrigerant
Air in system
Recover refrigerant, evacuatesystem,and re-
charge
Condenser air restricted or ai r short--cycling Determine cause and correct
Head pressure too low
Low refrigerant charge Check for leaks, repair, and recharge.
Compressor IPR leaking Replace compressor
Restriction in liquid tube Remove restriction
Excessive suction pressure
High heat load Check for source and eliminate
Compressor IPR leaking Replace compressor
Refrigerant overcharged Recover excess refrigerant
Suction pressure too low
Dirty air filter Replace filter
Low refrigerant charge Check for leaks, repair and recharge
Metering device or low side re stricted Remove source of restriction
Insufficient evaporator airflow
Increase air quantity
Check filter–replace if necessary
Temperature too low in conditioned area Reset thermostat
Outdoor ambient below 55°F (12.7°C) Install low--ambient kit
Filter drier restricted Replace filter
50VT--A