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Whirlpool WGFD28 Installation Instructions Manual page 34

80% 2-stage variable speed gas furnace gold models
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Symptoms of
Diagnostic/
Abnormal
Staus LED
Operation
Code
Furnace not
E6
operating.
Integrated
control module
LED display
provides "E6"
error code.
Furnace
E7
operating on
low stage gas
with high stage
induced draft
blower
High stage
circulator
blower
(temperature, of
conditioned air,
lower than
typical).
Integrated
control module
LED display
provides "E7"
error code.
Furnace fails to
E8
operate on high
stage. Furnace
operates
normally on low
stage.
Integrated
control module
LED display
provides "E8"
error code.
Furnace fails to
E9
operate on high
stage. Furnace
operates
normally on low
stage.
Integrated
control module
LED display
provides "E9"
error code.
34
Fault Description Possible Causes
Flame sense
Flame sensor is
microamp signal
coated/oxidized.
is low.
Flame sensor
incorrectly
positioned in
burner flame.
Lazy burner flame
due to improper
gas pressure or
combustion air.
Problem with
Improperly
igniter circuit.
connected igniter.
Shorted igniter.
Poor unit ground.
Igniter relay fault on
integrated control
module.
High-stage
High-stage
pressure switch
pressure switch
circuit is closed
contacts sticking.
at start of
Shorts in pressure
heating cycle.
switch circuit
Induced draft
wiring.
blower is
operating.
Furnace is
operating on
low stage only.
High-stage
Pressure switch
pressure switch
hose blocked,
circuit is not
pinched or
closed.
connected
improperly.
Induced draft
blower is
Blocked flue and/or
operating.
inlet air pipe,
blocked drain
Furnace is
system or weak
operating on
induced draft
low stage only.
blower.
Incorrect pressure
switch setpoint or
malfunctioning
switch contacts.
Loose or
improperly
connected wiring.
Corrective Actions
Sand flame sensor if
coated/oxidized.
Inspect for proper
sensor alignment.
Check inlet air piping
for blockage, proper
length, elbows and
termination.
Compare current gas
pressure to rating plate
info. Adjust as needed.
Check and correct
wiring from integrated
control module to
igniter
Replace shorted
igniter.
Check and correct
furnace ground wiring
Check igniter output
from control. Replace,
if necessary.
Replace high-stage
pressure switch.
Repair short in wiring.
Inspect pressure
switch hose. Repair, if
necessary.
Inspect flue and/or
inlet air piping for
blockage, proper
length, elbows and
termination.
Check drain system.
Correct as necessary.
Check induced draft
blower performance.
Correct as necessary.
Correct pressure
switch setpoint or
contact motion.
Tighten or correct
wiring connection.
Notes and Cautions
Turn off power prior to
repair.
Sand flame sensor
with emery cloth.
See "Vent/Flue Pipe"
section for piping
details.
See rating plate for
proper gas pressure.
Turn off power prior to
repair.
Replace igniter with
correct replacement
part.
Replace control with
correct replacement
part.
Turn off power prior to
repair.
Replace pressure
switch with correct
replacement part.
Turn off power prior to
repair.
Replace pressure
switch with correct
replacement part.
Replace induced draft
blower with correct
replacement part.

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