Wiring Diagram - Goodman GDS8 Installation And Operating Instructions Manual

Symptoms of Abnormal
Operation
• Circulator blower runs
continuously. No furnace
operation.
• Integrated control module
diagnostic LED is flashing
FOUR (4) flashes.
• Induced draft blower and
circulator blower runs
continuously. No furnace
operation.
• Integrated control module
diagnostic LED is flashing
FIVE (5) flashes.
• Furnace fails to operate.
• Integrated control module
diagnostic LED is flashing
SIX (6) flashes.
• Normal furnace
operation.
• Integrated control
module diagnostic LED
is flashing SEVEN (7)
flashes.
• Induced draft blower runs
continuously. No furnace
operation.
• Integrated control module
diagnostic LED is flashing
continuously.
• LED is steady on
2
LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch.
3
Applies to GMS8/GDS8/GHS8 Models only.
IO-242C
T
ROUBLESHOOTING
Associated
Fault Description(s)
LED Code 2
• Primary limit
4
circuit is open.
4 FLASHES
• Flame sensed
5 with no call for
heat.
5 FLASHES
• Rollout limit
6 open.
6 FLASHES
• Flame sense
7 microamp signal is
low.
7 FLASHES
• Polarity of 115
C
volt power is
reversed.
CONTINUOUS
FLASHING
steady on • Normal operation.
C
HART
Possible Causes
• Insufficient conditioned air
over the heat exchanger.
Blocked filters, restrictive
ductwork, improper
circulator blower speed,
or failed circulator blower.
• Short to ground in flame
sense circuit.
• Flame rollout.
• Misaligned burners,
blocked flue and/or air
inlet pipe, or failed
induced draft blower.
• Loose or improperly
connected wiring.
• Flame sensor is coated/
oxidized.
• Flame sensor incorrectly
positioned in burner
flame.
• Lazy burner flame due to
improper gas pressure or
combustion air.
• Polarity of 115 volt AC
power to furnace or
integrated control module
is reversed.
• Poor unit ground.
30
Corrective Action Cautions and Notes
• Check filters and • Turn power OFF
ductwork for blockage.
Clean filters or remove
obstruction.
• See Product
• Check circulator blower
speed and performance.
Correct speed or replace
blower if necessary.
• Turn power OFF
• Correct short at flame
sensor or in flame
sensor wiring
• Check burners for • See "Vent/Flue
proper alignment.
• Check flue and air inlet
piping for blockage,
proper length, elbows,
and termination.
• Replace induced
Correct as necessary.
• Check induced draft
blower for proper
performance.
Replace, if necessary.
• Tighten or correct
wiring connection.
• Sand flame sensor is • Turn power OFF
coated/oxidized.
• Inspect for proper sensor • Clean flame
alignment.
• Check inlet air piping for
blockage, proper length,
• See "Vent/Flue
elbows, and termination.
• Compare current gas
pressure to rating plate • See rating plate
info. Adjust as needed.
• Review wiring diagram to • Turn power OFF
correct polarity.
• Verify proper ground.
Correct if necessary.
• Check and correct wiring.
prior to repair.
Data Bulletin for
allowable rise
range and proper
circulator speed.
prior to repair.
Pipe" section for
piping details.
draft blower with
proper
replacement part.
prior to repair.
sensor with steel
wool.
Pipe" section for
piping details.
for proper gas
pressure.
prior to repair.
05/05