Carrier T--298 Air Conditioner User Manual


 
T--298
2-1
SECTION 2
TROUBLESHOOTING
For ducted units, the green operation indicator LED (SeeFigure 3-9) will flash if there is a problem.
Refer to Table 2--1 for diagnostic information.
SYMPTOM AND PROBABLE CAUSE
PROBABLE REMEDY
2.1 NO POWER TO UNIT
1. Master switch off
2. Open circuit breaker
3. Defective wiring
4. Loose electrical connections
5. Faulty switches, thermostat, or fan
6. 12 VDC not connected (Ducted System)
7. 12 VDC in--line fuse open (Ducted)
1. Reset master switch
2. Reset circuit breaker
3. Replace wiring
4. Tighten connections
5. Replace defective components
6. Connect to 12 VDC power source
7. Replace fuse
2.2 DUCTED UNIT WILL NOT OPERATE
1. Display not illuminated
2. Display illuminated
1. Check 1 2 Volt D C in--line fuse
2. Check 115 Volt AC Connections
2.3 DUCTED UNIT WILL NOT COOL
1. Green LED light flashes 5 times
2. Unit cools for a few moments then stops cooling
1. Check 115 volt AC power source
Momentarily disconnect 12 VDC power source
Disable compressor malfunction test switch.
Check AMP draw.
Check T
2. Remove grill, verify evaporator coil probe is
inserted into coil.
Check AMP draw.
Check T
Replace unit
2.4 COMPRESSO R POWER SUPPLY OPEN
1. Loose leads at compressor terminals
2. Defective motor overload switch
3. Defective capacitor
4. Open compressor windings
5. Seized compressor
6. Capacitor incorrectly wired
1. Tighten leads
2. Replace switch
3. Replace capacitor -- Refer to Paragraph 3.5.8
4. Replace compressor
5. Replace compressor
6. V erify capacitor wiring (Refer to wiring diagram)
2.5 C OMPRESSOR 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. Replace motor.
3. Check for dirty condenser coil, proper clearance
around unit, remove any obstructions.
4. Check AMP draw
5. Check for obstruction in line.
Check T.
Replace unit.
6. Replace switch.