Goodman AMH8 Service Instructions Manual page 47

SERVICING
Service Pr oblem
POSSIBLE CAUSE
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
Power Failure
Blown Fuse
Loos e Connection
Shorted or Brok en Wires
No Low Voltage
Faulty Thermostat
Faulty Transformer
Poor or High Resistance Ground
Improper Heat Anticipator Setting
Improper Thermostat Location
Faulty Limit or Roll Out Switch
Faulty Flame Sensor
Faulty Ignition Control
Gas Valve or Gas Supply Shut Off
Faulty Induced Draft Blower
Faulty Blower Motor (PSC)
Broken or Shorted Ignitor
Dirty Flame Sensor, Low UA
Stuck Gas Valve
Faulty Gas Valve
Open Auxiliary Limit
Improper Air Flow or Distribution
Cycling on Limit
Delayed Ignition
Flashback
Orifice Size
Gas Pressure
Cracked Heat Exchanger
Furnace Undersized
Furnace Oversized
Faulty Pressure Switch
Blocked or Restricted Flue
Open Roll Out Switch
Bouncing On Pres sure Switch
No Heat Unsatisfactory Heat
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Test Method
Remedy
Tes t Voltage
Tes t Voltage
Check Wiring
Check Wiring
Check Transformer
Check Thermostat
Check Transformer
Measure Ground Resistance
Adjust Heat Anticipator Setting
Relocate Thermostat
Tes t Control
Tes t Flame Sensor
Tes t Control
Turn Valves to On Position
Tes t Induced Draft Motor
Tes t Blower Motor (PSC)
Tes t Ignitor
Clean Flame Sensor
Replace Gas Valve
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Replace Gas Valve
Reset Control
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Check Duct Static
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Check Controls & Temperature Rise
Tes t for Delayed Ignition
Tes t for Flashback
Check Orifices
Check Gas Pressure
Check Burner Flames
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Replace with Proper Size Furnace
Replace with Proper Size Furnace
Tes t Pressure Switch
Check Flue/Drawdown Press ure
Tes t Flame Roll Out Control
Tes t Negative Pres sure
S-1
S-4
S-2
S-3A
S-4
S-3A
S-4
S-17B
S-3B
S-316
S-300 / S-302
S-314
S-313
S-317
S-303
S-16A,B,C
S-308
S-314
S-304
S-304
S-301
S-200
S-201 / S-300
S-312
S-309 / S-311
S-306 / S-311
S-307
S-305
S-318
S-318
S-310
S-310
S-302
S-310
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