Goodman APG 13 Service Instructions Manual page 33

SERVICING
Com plaint
POSSIBLE CAUSE
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
Pow er Failure
Blow n Fuse
Loose Connection
Shorted or Broken Wires
No Low V oltage
Faulty Thermostat
Faulty Transf ormer
Poor or High Resistance Ground
Improper Heat A nticipator Setting
Improper Thermostat Location
Faulty Limit or Roll Out Sw itch
Faulty Flame Sensor
Faulty Ignition Control
Gas V alve or Gas Supply Shut Of f
Faulty Induced Draf t Blow er
Dirty Flame Sensor, Low uA
Flame Sensor not in Flame, Low uA
Faulty Gas V alve
No High Stage Heat (2 Stage Only)
Open A uxillary Limit
Improper A ir Flow or Distribution
Locking out on Main Limit
Delayed Ignition
Flashback
Orif ice Size
Gas Pressure
Cracked Heat Exchanger
Stuck Gas V alve
Furnace Undersized
Faulty Pressure Sw itch
Blocked or Restricted Flue
Open Roll Out Sw itch
Bouncing On Pressure Sw itch
GAS HEATING ANALYSIS CHART
No He at Uns atis factor y He at
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Te st Me thod
Re m e dy
Test V oltage
Test V oltage
Check Wiring
Check Wiring
Check Transf ormer
Check Thermostat
Check Transf ormer
Measure Ground Resistance
A djust Heat A nticipator Setting
Relocate Thermostat
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Test Control
Test Flame Sensor
Test Control
Turn V alves to On Position
Test Blow er
Clean Flame Sensor
Test/A djust Position of Flame Sensor
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Replace Gas V alve
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Check Thermostat, Control, Gas V alve
Reset Control
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Check Duct Static
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Check Controls, Gas Press., & Temp. Rise
Test f or Delayed Ignition
Test f or Flashback
Check Orif ices
Check Gas Pressure
Check Burner Flames
Replace Gas V alve
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Replace w ith Proper Size Furnace
Test Pressure Sw itch
Check Flue/Draw dow n Pressure
Test Control
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Test Negative Pressure
S-1
S-4
S-2
S-3
S-4
S-3
S-4
S-313
S-3
S-300,S-301,S-302
S-314
S-313
S-304
S-303
S-314
S-314
S-304
S-3,S-313,S-304
S-301
S-300
S-308
S-309
S-306
S-307
S-302
S-304
S-310
S-310
S-302
S-310
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