Troubleshooting Chart

Symptoms of Abnormal

Associated

Fault Description(s)

Possible Causes

Corrective Action

Cautions and Notes

Operation

LED Code2

 

 

 

 

 

 

 

 

 

• Furnace fails to operate.

NONE

• No 115 volt power

• Manual disconnect switch

• Assure 115 and 24 volt

• Turn power OFF

• Integrated control

 

to furnace, or no 24

OFF, door switch open, or

power to furnace

prior to repair.

 

volt power to

24 volt wires improperly

integrated control

 

module diagnostic LED

 

• Replace integrated

 

integrated control

connected or loose.

module.

provides no signal.

 

control module

 

module.

 

• Check integrated control

 

 

• Blown fuse or circuit

fuse with 3A

 

 

 

 

 

 

module fuse (3A).

 

 

• Blown fuse or

breaker.

automotive fuse.

 

 

Replace if necessary.

 

 

circuit breaker.

• Intergrated contol module

• Read precautions

 

 

• Check for possible

 

 

 

 

 

• Intergrated contol

has an internal fault

in “Electrostatic

 

 

shorts in 115 and 24 volt

 

 

module has an

 

Discharge” section

 

 

 

circuits. Repair as

 

 

internal fault

 

of manual.

 

 

 

necessary.

 

 

 

 

 

 

 

 

 

• Replace bad intergrated

 

 

 

 

 

control module.

 

 

 

 

 

 

 

• Furnace fails to

 

• No signal from

• Improper thermostat

• Check thermostat

• Turn power OFF

operate.

ON

thermostat

connection or setting.

connections and

prior to repair.

• Integrated control

 

 

settings.

• Improper

 

 

 

 

 

 

 

module diagnostic LED

1 FLASH

 

 

 

thermostat

is lit continuously.

 

 

 

connection or

 

 

 

 

 

setting.

 

 

 

 

 

 

• Furnace fails to operate.

 

• Furnace lockout due

• Failure to establish flame.

• Locate and correct gas

• Turn power OFF

• Integrated control

1

to an excessive

Cause may be no gas to

interruption.

prior to repair.

 

number of ignition

burners, bad igniter or

• Replace or realign

• Igniter is fragile,

module diagnostic LED

 

 

“retries” (3 total)1.

igniter alignment,

igniter.

1 FLASH

handle with care.

is flashing ONE (1)

 

improper orifices, or

• Check flame sense

flash.

 

• Auxiliary limit open

 

 

coated/oxidized or

• Sand flame sensor

 

signal. Sand sensor if

 

 

 

 

 

 

improperly connected

coated and/or oxidized.

with emery cloth.

 

 

 

flame sensor.

• Check flue piping for

• See “Combustion

 

 

 

• Loss of flame after

 

 

 

blockage, proper length,

and Ventilation Air

 

 

 

establishment. Cause

elbows, and termination.

Requirements” and

 

 

 

may be interrupted gas

• Verify proper induced

“Category I

 

 

 

supply, lazy burner flames

draft blower

Venting (Vertical

 

 

 

(improper gas pressure or

performance.

Venting)” section

 

 

 

restriction in flue or

• Check circulator blower

for details.

 

 

 

improper induced draft

 

 

 

speed and performance.

 

 

 

 

blower performance.

• See Product Data

 

 

 

Correct speed or replace

 

 

 

• Insufficient conditioned

Bulletin for

 

 

 

blower if necessary.

 

 

 

allowable rise

 

 

 

air over the heat

 

 

 

 

 

range and proper

 

 

 

exchanger. Blocked

 

 

 

 

 

circulator speed.

 

 

 

filters, restrictive

 

 

 

 

ductwork, improper

 

 

 

 

 

circulator blower speed,

 

 

 

 

 

or failed circulator blower.

 

 

• Furnace fails to operate.

 

• Low stage pressure

• Induced draft blower

• Replace induced draft

• Turn power OFF

• Integrated control

2

switch circuit is

pressure switch contacts

blower pressure

prior to repair.

 

closed.

sticking.

switch.

 

module diagnostic LED

 

• Replace pressure

 

 

 

 

is flashing TWO (2)

2 FLASHES

• Induced draft blower

• Shorts in pressure switch

• Repair short.

switch with proper

flashes.

 

is not operating.

circuit.

 

replacement part.

 

 

 

 

 

 

• Induced draft blower

 

• Pressure switch

• Pressure switch hose

• Inspect pressure

• Turn power OFF

runs continuously with

3

circuit not closed.

blocked, pinched or

switch hose. Repair, if

prior to repair.

no further furnace

 

• Induced draft blower

connected improperly.

necessary,

• See “Combustion

operation.

 

 

 

 

 

• Inspect flue for

and Ventilation Air

3 FLASHES

is operating.

• Blocked flue or weak

 

blockage, proper

Requirements”

• Integrated control

 

 

induced draft blower.

module diagnostic LED

 

 

• Incorrect pressure switch

length, elbows, and

and “Category I

is flashing THREE (3)

 

 

termination.

Venting (Vertical

flashes.

 

 

setpoint or malfunctioning

• Correct pressure

Venting)” section

 

 

switch contacts.

for details.

 

 

 

 

 

 

• Loose or improperly

switch setpoint or

• Replace pressure

 

 

 

contact motion.

 

 

 

connected wiring.

• Tighten or correct

switch with proper

 

 

 

 

replacement part.

 

 

 

 

wiring connection.

 

1Integrated control module will automatically attempt to reset from lockout after one hour.

IO-247A

29

12/04

 

 

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Goodman Mfg AMV8 instruction manual Troubleshooting Chart
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