Carrier 1995 Room Air - Manual (Page 12)

TROUBLESHOOTING
SYMPTOM AND
PROBABLE CAUSE
PROBABLE REMEDY
COMPRESSOR DOES NOT RUN
Opening in Power Circuit
1 Control off
2. Blown fuse
3 Defective wiring
4 Defective service cord
5 Loose electrical connections
6 Faulty switches, thermostat, or fan
1 Reset control button
2 Replace fuse
3 Replace wiring
4 Replace service cord
5 Tighten connections
6 Replace defective component
Compressor Power Supply Open
1 Loose leads at compressor terminals
2 Defective motor overload switch
3 Defective capacitor
4. Open compressor windings
5. Seized compressor
1 Tighten leads
2 Replace switch
3 Replace capacitor
4 Replace compressor
5 Replace compressor
COMPRESSOR RUNS BUT CYCLES
Fan Operating Erratically
1 Loose lead at fan motor
2. Defective or burned out motor
3 Outdoor air restricted or recirculating
4 Overcharge or noncondensables in system
5 Restricted discharge line
6 Defective motor overload switch
1 Tighten lead
2 Repair or replace motor
3 Check for dirty filter, proper clearances around unit —
remove any obstructions
4 Recover refrigerant, evacuate and recharge system according to
nameplate specifications
5. Check for obstruction in line, replace tubing if required
6 Replace switch
Cycles on Compressor Overload
1 Defective run capacitor
2 Defective compressor bearings or valves
3 Greatly restricted indoor air (Iced evaporator coil)
4 Low refrigerant charge
5 Evaporator capillary restricted
6 Liquid line restricted
7. Compressor hot
8 Weak or inconsistent iine power
1 Replace capacitor
2 Replace compressor
3 Defrost evaporator coil
4 Add charge according to approved method
5 Replace capillary
6 Replace strainer
7 Verify refrigerant charge
8 Check line voltage at time of compressor start-up
INSUFFICIENT COOLING
Cooling Air Not Adequate
1 Dirty filter or coil
2. Iced evaporator coil (slightly low refrigerant charge)
3 Defective fan motor
1 Clean as required
2 Recharge
3 Replace fan motor
Condenser Air Not Adequate
1 Condenser air restricted
2 Dirty coil
3 Defective fan motor
1 Check for obstructions and dirty filter Remedy as required
2 Clean coil
3 Replace fan motor
Unit Undersized Re-evaluate unit for proper capacity
Air Leakage Check caulking around sleeve Repair if necessary
Capillary Restricted Replace capillary
Compressor Flooding
1 Unit overcharged
2 Low evaporator airflow
1 Recover refrigerant, evacuate and recharge system according to
nameplate specifications
2 Clean filter and/or evaporator coil
AIR SWEEP NOT WORKING
1 Cam disengaged from lever
2 Air sweep motor failure
1 Activate motor and allow cam to re-engage
2 Replace motor
MESSAGE DISPLAY CODES
d
CP
PF
01
■
Unit in Dehumidification mode
Unit in Compressor Protection mode Allow 2 minutes for restart
Power failure
Room air thermistor failure
Copyright 1995 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without Incurring obligations
Book 11 }4 PC 131 Catalog No 537-323 Printed in USA Form73XC-1SS Pg 12 1-95 Replaces: New