Carrier 40KMC Series Installation Instructions Manual page 27

PROBLEM
Compressor and Fan of the Outdoor
Unit Will Not Start
Compressor Will Not Start, But Out-
door Fan is Operating
Compressor Stops Due to Over-tem-
perature
Compressor Runs Continuously
Frequent Ice-Build-Up on Outdoor
Coil
Discharge Pressure Too High
Discharge Pressure Too Low
Suction Pressure Too High
Suction Pressure Too Low
Outdoor Fan Cycling Due to Over-
Temperature Protection
Table
15 - Troubleshooting
POSSIBLE CAUSE
Unit not energized
Main switch is set to OFF
Main switch fuses are blown
Compressor cycling protection is on
Main power voltage is too low
Electrical connections are too loose or are wrong
Electrical connections of compressor are loose or
wrong
Compressor burnt out; seized or protection device
on
Wrong refrigerant charge in unit (excessive or low)
or air or other non-condensable gasses in the
circuit
Main voltage is too high or too low
Condenser coil obstructed
Outdoor fan off
Wrong indoor unit thermistors
Refrigerant circuit clogged
Reversing valve faulty on heat pump models
Expansion device clogged or covered with ice
Unit selected is too small for application require-
ments
Indoor temperature setting too low or too high
Outdoor unit fan faulty
Air or other non-condensable gasses in the cir-
cuit
Obstructions at air intake or dirty indoor unit filters
Outdoor fan is stopped
Outdoor coil dirty or obstructed
Condenser fan faulty
Indoor temperature setting too low or too high
Air or other non-condensable gasses in the cir-
cuit
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
Reversing valve faulty or internal leak
Indoor temperature setting too high or too low
Evaporator coil covered with ice
Expansion device or suction line clogged
Outdoor fan does not stop during defrost periods
Electrical connection loose
Fan motor burn out
Fan bearing seized
Expansion device clogged or covered with ice
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 neces-
sary.
Drain refrigerant, evacuate and recharge.
CAUTION: Do not vent 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 equipment.
Contact a qualified service technician for a system evalu-
ation.
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.
Check cause and repair.
Clean or remove obstructions.
Replace condenser fan.
Check temperature setting.
Drain refrigerant, evacuate and recharge.
CAUTION: Do not vent refrigerant to the atmosphere; use
refrigerant recovery equipment.
Check temperature setting.
Clean or remove obstructions.
Clean filter.
Check temperature setting.
Replace reversing valve.
Check temperature setting.
Air circulation on the evaporator not sufficient; check and
repair.
Check and repair.
Check electrical parts.
Check connections.
Replace.
Check and repair.
Drain refrigerant, evacuate and replace.
CAUTION: Do not vent refrigerant to the atmosphere; use
refrigerant recovery equipment.
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