Carrier T--298 - Manual (Page 22)

T--298 2-2
SYSTEM AND PROBABLE CAUSE PROBABLE REMEDY
2.6 CYCLES ON COMPRESSOR OVERLOAD
1. Defective run capacitor
2. Defective compressor bearings or valves
3. Greatly restricted evaporator air, iced evaporator
coil.
4. Low refrigerant charge
5. Evaporator capillary restricted
6. Liquid line restricted
7. Compressor hot
8. Weak or inconsistent line power
1. Replace capacitor -- Refer to Paragraph 3.5.8
2. Replace unit.
3. Defrost evaporator coil.
4. Replace unit.
5. Replace unit.
6. Replace unit.
7. Verify refrigerant charge.
Check AMP draw.
Check
∆ T.
8. Check line voltage at time of compressor start--up.
2.7 INSUFFICIENT COOLING, COOLING AIR NOT ADEQUATE
1. Dirty evaporator coil
2. Iced evaporator coil, slightly low refrigerant charge
3. Improper fan operation
4. Defective fan motor
5. Return air filter is dirty 1. Clean as required.
2. Defrost or Recharge.
3. Verify fan rotation (Refer to wiring diagram)
4. Replace fan motor.
5. Remove and clean filters (Refer to paragraphs 3.3.1
& 3.4.1)
2.8 CONDENSER AIR NOT ADEQUATE
1. Outside Air Restricted
2. Dirty coil
3. Defective fan motor 1. Check for obstruction at coil. Remedy as required.
2. Clean coil.
3. Replace fan motor.
2.9 INSUFFICIENT COOLING
1. Unit undersized
2. Capillary restricted 1. Re--evaluate unit for proper capacity.
2. Check AMP draw.
Check ∆ T.
Replace unit.
2.10 COMPRESSOR FLOODING
1. Unit overcharged
2. Low evaporator airflow
3. Defective electrical connections
1. Check AMP draw.
Check ∆ T.
Replace unit.
2. Clean filter and/or evaporator coil.
3. Check connections per wiring diagram and tighten
any loose connections.
2.11 HEATER CYCLES ON LIMIT SWITCH (HEAT/ COOL VERSION ONLY)
1. Dirty filter
2. Blocked evaporator air inlet (indoor)
3. Low airflow due to fan motor speed 1. Clean or replace filter.
2. Remove blockage.
3. Check fan motor. Repair or replace as necessary.
2.12 AIR SWEEP NOT WORKING (FREE BLOW VERSION ONLY)
1. Ceiling grill not properly aligned
2. Linkage in upper control box stuck
3. Air sweep motor failure 1. Align ceiling grill.
2. Align and lubricate linkage.
3. Replace motor.
2.13 WATER LEAKAGE
1. Water dripping from ceiling unit. 1. Verify vehicle is level
Tighten unit mounting bolts evenly or replace unit
gasket.