Carrier 60 Service Manual download pdf (Page 33)

T -295

3-5

Table 3 -3 General System Troubleshooting Procedures -- Continued

INDICATION/

TROUBLE

POSSIBLE CAUSES

REFERENCE

SECTION

3.3.4 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

3.3.5 Control System Malfunction

Will not control Sensor or transducer defective

Relay(s) defective

Microprocessor controller malfunction

Logic Board J3 connector unplugged

4.21 or 4.22

Check

3.3.6 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

Clean/Replace

Clean/Defrost

Check/Replace

1.6

Check

3.3.7 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 tube

4.8

Check

4.6

Replace

4.19

Low superheat and liquid slug-

ging in the compressor

Bulb is loose or not installed.

Superheat setting too low

Ice or other foreign m aterial holding valve open

4.19

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

4.7

Replace

4.19

3.3.8 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

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

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Carrier 60 Service Manual Page 33

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