![background image](http://html1.mh-extra.com/html/carrier/capri-280/capri-280_operation-and-service-manual_2561122026.webp)
T-283
3-5
Table 3-3. General System Troubleshooting Procedures - Continued
INDICATION/
TROUBLE
POSSIBLE CAUSES
REFERENCE
SECTION
ABNORMAL NOISE OR VIBRATIONS --- Continued
Condenser or evaporator fans
Loose mounting hardware
Defective bearings
Blade interference
Blade missing or broken
Check/Tighten
Replace
Check
Check/Replace
CONTROL SYSTEM MALFUNCTION
Will not control
Sensor or transducer defective
Relay(s) defective
Microprocessor controller malfunction
4.14 or 4.15
Check
Check
NO EVAPORATOR AIR FLOW OR RESTRICTED AIR FLOW
Air flow through coil blocked
Coil frosted over
Dirty coil
Dirty filter
Defrost coil
Clean
Clean/Replace
No or partial evaporator air flow
Motor(s) defective
Motor brushes defective
Evaporator fan loose or defective
Fan damaged
Return air filter dirty
icing of coil
Fan relay(s) defective
Safety device open
Fan rotation incorrect
Repair/Replace
Replace
Repair/Replace
Repair/Replace
Clean/Replace
Clean/Defrost
Check/Replace
1.6
Check
EXPANSION VALVE MALFUNCTION
Low suction pressure with high
superheat
Low refrigerant charge
Wax, oil or dirt plugging valve orifice
Ice formation at valve seat
Power assembly failure
Loss of bulb charge
Broken capillary
4.5 and 4.7
Check
4.6
Replace
Replace
4.11
Low superheat and liquid slugging
in the compressor
Superheat setting too low
Ice or other foreign material holding valve open
4.11
4.6
Side to side temperature differ-
ence (Warm Coil)
Wax, oil or dirt plugging valve orifice
Ice formation at valve seat
Power assembly failure
Loss of bulb charge
Broken capillary
Check
4.6
Replace
Replace
4.11
HEATING MALFUNCTION
Insufficient heating
Dirty or plugged heater core
Coolant solenoid valve(s) malfunctioning or plugged
Low coolant level
Strainer(s) plugged
Hand valve(s) closed
Water pumps defective
Auxiliary Heater malfunctioning.
Clean
Check/Replace
Check
Clean
Open
Repair/Replace
Repair/Replace
No Heating
Coolant solenoid valve(s) malfunctioning or plugged
Controller malfunction
Pump(s) malfunctioning
Safety device open
Check/Replace
Replace
Repair/Replace
1.6
Continuous Heating
Coolant solenoid valve stuck open
Replace
Summary of Contents for CAPRI-280
Page 1: ...Model CAPRI 280 Septa T 283 Bus Air Conditioning Equipment...
Page 39: ...5 2 Figure 5 1 Electrical Wiring Schematic Diagram Drawing No 62 10112 00 Sheet 1 of 3...
Page 40: ...5 3 Figure 5 1 Electrical Wiring Schematic Diagram Drawing No 62 10112 00 Sheet 2 of 3...
Page 41: ...5 4 Figure 5 1 Electrical Wiring Schematic Diagram Drawing No 62 10112 00 Sheet 3 of 3...