Table 7 -- Troubleshooting
PROBLEM
Compressor and Fan of the Outdoor
Unit Will Not Start
Compressor Will Not Start, But
Outdoor Fan is Operating
Compressor Stops Due to
Overtemperature
Compressor Runs Continuously
POSSIBLE CAUSE
Unit not energized
Main switch is set to OFF
Main switch fuses are blown
Compressor cycling protection ison
Main power voltage istoo low
Electrical connections are too loose or are
wrong
iElectrical connections of compressor are loose
orwrong
Compressor burnt out; seized or protection
device on
Wrong refrigerantcharge in unit excessive or
low) or air or other noncondensable gasses in
the circuit
Main voltage is too highortoo low
Condenser coil obstructed
Outdoor fan off
Wrong indoor unit thermistors
Refrigerant circuitclogged
Reversing valve faulty on heat pump models
Expansion device clogged or covered with ice
Unit selected istoo small for application
requirements
Indoor temperature setting too low or too high
Outdoor unit fan faulty
Air or other noncondensable gasses in the
circuit
Obstructions at air intake or dirty indoorunit
filters
Outdoor fan is stopped
SOLUTION
Check the main power connection.
Check and put it to ON position.
Replace fuses.
Wait for 3 minutes.
Check and set to the correct voltage.
Check and tighten or correct connections.
Check and tighten or repair compressor.
Check for the cause and replace compressor if
necessary.
Drain refrigerant, evacuate and recharge.
CAUTION: Do notvent refrigerant to the atmosphere;
use refrigerant recovery equipment.
Check voltage setting and adjust if necessary.
Remove obstruction.
Check cause and resume operation or repair.
Replace thermistors.
Check and remove obstructions.
Replace reversing valve.
Drain refrigerant,evacuate and recharge.
CAUTION: Do not vent refrigerant to the atmosphere;
use refrigerant recovery equ=pment.
Contact a qualified service technician for a system
evaluation.
Check temperature setting.
Replace outdoor fan.
Drain refrigerant,evacuate and recharge.
CAUTION: Do not vent refrigerant to the atmosphere;
use refrigerant recovery equipment.
Remove obstruction and/or clean filter.
Frequent Ice-Build-Up on Outdoor Check cause and repair.
Coil
Discharge Pressure Too High Outdoor coil dirty orobstructed
Condenser fan faulty
Indoor temperature setting too low or too high
Air or other noncondensable gasses inthe
circuit
Indoor temperature setting too high or too low
Outdoor coil dirty or obstructed
Indoor unit air filter dirty
Indoor temperature setting too high or too low
Reversingvalve faulty or internal leak
Indoor temperature setting too high or too
Evaporatorcoil covered with ice
Expansion device or suction lineclo()ged
Outdoor fan does notstop during defrost
)edods
Electrical connection loose
Fan motorburn out
Fan bearing seized
Expansion device clogged or covered with ice
Discharge Pressure Too Low
Suction Pressure Too High
Suction Pressure Too Low
Outdoor Fan Cycling Due to
Over-Temperature Protection
Clean or remove obstructions.
Replace condenser fan.
Check temperature setting.
Drain refrigerant, evacuate and recharge.
CAUTION: Do not vent refrigerantto the atmosphere;
use refrigerant recovery equipment.
Check temperature setting.
C_eanor remove obstructions.
Clean filter.
Check temperature setting.
Replace reversingvalve.
Check temperature setting.
Air circulationon the evaporator notsufficient;check
and repair.
Check and repair.
Check electrical parts.
Check connections.
Replace.
Check and repair.
Drain refrigerant, evacuate and replace.
CAUTION: Do notvent refrigerant to the atmosphere;
use refrigerant recovery equipment.
15
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