Air Conditioner Troubleshooting Chart - Carrier 38TN Service Manual

1. Locate the unit on side of structure opposite the prevailing
winds.
2. Elevate the unit to height where drifting sand cannot pile up
against coil. Four-in. high mounting feet are available as
accessories and can be used to elevate the unit.
3. Addition of coastal filter (see PDD for accessory listing).
COMPRESSOR
WILL NOT RUN
CONTACTOR CONTACTOR
OPEN CLOSED
COMPRESSOR
POWER SUPPLY POWER SUPPLY
OPEN
DEFECTIVE
LOOSE LEADS AT
LOW-VOLTAGE
COMPRESSOR
TRANSFORMER
OPEN FAULTY START
THERMOSTAT GEAR (1-PH)
OPEN SHORTED
OR GROUNDED
OPEN CONTROL
COMPRESSOR
CIRCUIT
MOTOR
WINDINGS
LOSS OF COMPRESSOR
CHARGE STUCK
COMPRESSOR
CONTACTOR OR INTERNAL
COIL DEFECTIVE PROTECTION
OPEN
LOOSE
DEFECTIVE RUN
ELECTRICAL
CAPACITOR
CONNECTION
AIR CONDITIONER
TROUBLESHOOTING CHART
NO COOLING OR
INSUFFICIENT
COOLING
COMPRESSOR
RUNS BUT
CYCLES ON
INTERNAL
OVERLOAD
OUTDOOR FAN
STOPPED OR
LOOSE LEAD
CYCLING ON AT FAN MOTOR
OVERLOAD
OUTDOOR AIR
MOTOR
RESTRICTED OR
DEFECTIVE
RECIRCULATING
RESTRICTED INCORRECT
DISCHARGE
OFM
TUBE CAPACITOR
OVERCHARGE
OR NON-
CONDENSABLES
IN SYSTEM
LOW
REFRIGERANT
CHARGE
LINE VOLTAGE
TOO HIGH OR
LOW
DEFECTIVE RUN
CAPACITOR
COMPRESSOR
BEARINGS
HIGH
SUPERHEAT
Fig. 21—Air Conditioner Troubleshooting Chart
18
Maintenance
1. Frequent inspection of coil and basepan especially after storms
and/or high winds.
2. Clean coil by flushing out sand from between coil fins and out
of basepan as frequently as inspection determines necessary.
3. In off season, cover with covering that allows air to circulate
through but prevents sand from sifting in (such as canvas
material). Do not use plastic as plastic will hold moisture.
COMPRESSOR
INSUFFICIENT
HIGH SUCTION
LOW SUCTION
PRESSURE
DIRTY AIR
COMPRESSOR
FILTERS
DUCT
RESTRICTED
RELIEF OPEN
DAMPERS
PARTLY CLOSED
INDOOR COIL
FROSTED
SLIGHTLY
LOW ON
REFRIGERANT
LIQUID LINE
SLIGHTLY
RESTRICTED
PISTON
RESTRICTED
INCORRECT
SIZE
PISTON
INDOOR COIL
STRAINER
RESTRICTED
INDOOR
BLOWER MOTOR
DEFECTIVE OR
CYCLING ON OL
RUNS BUT
COOLING
HIGH SUCTION
LOW HEAD LOW
PRESSURE SUPERHEAT
DEFECTIVE
UNIT
OVERCHARGED
VALVES
INTERNAL INCORRECT
PRESSURE
SIZE
PISTON
A90208