Goodman [A/G]PG, Service Instructions Manual

SERVICING

25

COOLING - SERVICE ANALYSIS GUIDE

X = applies to 3 phase units only

Complaint

System 

Operating 

Pressures

POSSIBLE CAUSE

DOTS IN ANALYSIS

GUIDE INDICATE

"POSSIBLE CAUSE"

SYMPTOM

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Test Method

Remedy

S

ee S

e

rv

ice

 Pr

oce

dure

 R

e

f.

Power Failure

•

Test Voltage

S-1

Blown Fuse

•

X

• •

X

Inspect Fuse Size & Type

S-1

Loose Connection

•

• • • •

Inspect Connection - Tighten

S-2, S-3

Shorted or Broken Wires

• • • • • •

Test Circuits With Ohmmeter

S-2,S-3

Open Overload

•

• • •

Test Continuity of Overload

S-16A, S-17A

Faulty Thermostat

•

•

Test continuity of Thermostat & Wiring

S-3

Faulty Transformer

•

•

Check control circuit with voltmeter

S-4

Shorted or Open Capacitor

•

• • •

X

Test Capacitor

S-15

Shorted or Grounded Compressor

•

•

Test Motor Windings

S-17B

Unloader Solenoid 

•

•

•

Test unloader operation

S-17C

Compressor Stuck

• •

•

Use Test Cord

S-17D

Faulty Compressor Contactor

•

•

• •

Test continuity of Coil & Contacts

S-7, S-8

Faulty Fan Relay

•

Test continuity of Coil And Contacts

S-7

Open Control Circuit

• • •

Test Control Circuit with Voltmeter

S-4

Low Voltage

•

• •

Test Voltage

S-1

Faulty Evap. Fan Motor

•

•

Repair or Replace

S-16A

Shorted or Grounded Fan Motor

•

•

Test Motor Windings

S-16A

Improper Cooling Anticipator

•

•

Check resistance of Anticipator

S-3B

Shortage of Refrigerant

• •

• •

Test For Leaks, Add Refrigerant

S-101, 103

Restricted Liquid Line

• •

• •

Remove Restriction, Replace Restricted Part

S-112

Dirty Air Filter

•

• •

•

Inspect Filter-Clean or Replace

Dirty Indoor Coil

•

• •

•

Inspect Coil - Clean

Not enough air across Indoor Coil

•

• •

•

Check Blower Speed, Duct Static Press, Filter

S-200

Too much air across Indoor Coil

•

Reduce Blower Speed

S-200

Overcharge of Refrigerant

• •

•

• •

Recover Part of Charge

S-113

Dirty Outdoor Coil

• •

•

•

Inspect Coil - Clean

Noncondensibles

•

•

•

Recover Charge, Evacuate, Recharge

S-114

Recirculation of Condensing Air

•

•

•

Remove Obstruction to Air Flow

Infiltration of Outdoor Air

•

• •

Check Windows, Doors, Vent Fans, Etc.

Improperly Located Thermostat

•

•

Relocate Thermostat

Air Flow Unbalanced

•

•

Readjust Air Volume Dampers

System Undersized

•

•

Refigure Cooling Load

Broken Internal Parts

•

Replace Compressor

S-115

Inefficient Compressor

•

• •

Test Compressor Efficiency

S-104

Unbalanced Power, 3PH

•

• •

Test Voltage

S-1

Wrong Type Expansion Valve

• • •

•

• •

Replace Valve

S-110

Expansion Device Restricted

• • •

•

• •

Remove restriction or replace expansion device

S-110

Expansion Valve Bulb Loose

•

Tighten Bulb Bracket

S-105

Inoperative Expansion Valve

•

•

•

Check Valve Operation

S-110

Loose Hold-down Bolts

•

Tighten Bolts

Flowrator Not Seating Properly

•

• •

Check Flowrator & Seat or Replace Flowrator

S-111

No Cooling

Unsatisfactory Cooling