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Table 8 --Troubleshooting
Chart
SYMPTOM
Compressor
and outdoor fan
will not etart
Compressor
will not etart but condenser
fan
runs
Compressor
cycles (other than normally
eat-
isfying)
cooling/heating
calls
Compressor
operates
continuously
Exceseive
head
pressure
Head
pressure
too
low
Excessive
suction
pressure
Suction
pressure
too
low
IFM
does
sot
run
IFM
operation
is intermittent
CAUSE
Power failure
Fuse blown or circuit breaker tripped
Defective contactor, transformer,
control relay, or high-
pressure, loss-of-charge
or low-pressure switch
Insufficient line voltage
Incorrect or fruity wiring
UI setting too low/too high
Faulty wiring or circuit
Loose
connections
in
compressor
Compressor
motor burned oat, seized, or
internal overload open
Defective run capacitor, overload, or PTC (positive
temperature
coefficient) thermistor
Low input voltage (20 percent low)
Refrigerant
overcharge or undercharge
Defective compressor
Insufficient line voltage
Blocked outdoor coil
Defective run/start capacitor, overload or start relay
Faulty outdoor fan motor or capacitor
Restriction in refrigerant system
Dirty air filter
Unit undersized for load
UI temperature
set too low
Low refrigerant
charge
Air in system
Outdoor coil dirty or restricted
Dirty air filter
Dirty indoor or outdoor coil
Refrigerant
overcharged
Air in system
Indoor or outdoor air restricted
or air short-cycling
Low refrigerant
charge
Restriction in liquid tube
High heat load
Reversing valve hung up or leaking internally
Refrigerant
overcharged
Dirty air filter
Low refrigerant
charge
Metering device or low side restricted
Insufficient coil airflow
Temperature
too low in conditioned
area
Outdoor ambient below 55°P
Filter drier restricted
Blower wheel not secured to shaft
Insufficient voltage at motor
Power connectors
not properly sealed
Water dripping into motor
Connectors
not firmly sealed
REMEDY
Call power company
Replace fuse or reset circuit breaker
Replace component
Determine cause and correct
Check wiring diagram and rewire correctly
Reset UI setting
Check wiring and repair or replace
Determine cause
Replace compressor
Determine cause and replace
Determine cause and correct
Recover refrigerant,
evacuate system, and re-
charge to capacities
shown on rating plate
Replace and determine
cause
Determine cause and correct
Determine cause and correct
Determine cause and replace
Replace
Locate restriction and remove
Replace filter
Decrease load or increase unit size
Reset UI setting
Locate leak, repair, and recharge
Recover refrigerant,
evacuate system, and re-
charge
Clean coil or remove restriction
Replace filter
Clean coil
Recover excess
refrigerant
Recover refrigerant,
evacuate system, and re-
charge
Determine cause and correct
Check for leaks, repair and recharge
Remove restriction
Check for source and eliminate
Replace valve
Recover excess
refrigerant
Replace filter
Check for leaks, repair and recharge
Remove source of restriction
Check filter replace if necessary
Reset UI setting
Verify low-ambient
cooling enabled in UI
Replace
Properly tighten blower wheel to shaft
Determine
cause and correct
Connectors
should snap easily; do not force
Verify proper drip loops in connector
wires
Gently pull wires individually to be sure they are
crimped into the housing
2d
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