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Whirlpool WGFD28 Installation Instructions Manual page 35

80% 2-stage variable speed gas furnace gold models
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Symptoms of
Diagnostic/
Abnormal
Staus LED
Operation
Code
Furnace fails to
EA
operate.
Integrated
control module
LED display
provides "EA"
error code.
Furnace fails to
d0
operate.
Integrated
control module
LED display
provides "d0"
error code.
Operation
d4
different than
expected or no
operation.
Integrated
control module
LED display
provides "d4"
error code.
Furnace fails to
b0
operate.
Integrated
control module
LED display
provides "b0"
error code.
Fault Description Possible Causes
Polarity of
Polarity of 115-volt
115-volt AC is
AC power to
reversed.
furnace or
integrated module
is reversed.
Poor furnace
ground.
Data not yet on
Furnace does not
network.
contain any shared
data.
Invalid memory
Shared data set on
card data.
memory card has
been rejected by
integrated control
module.
Circulator
Loose wiring
blower motor is
connection at
not running
circulator motor
when it should
power leads or
be running.
circulator motor
power leads
disconnected.
Open circuit in
inductor or loose
wiring connection
at inductor (³⁄₄ Hp
and 1 Hp models
only).
Failed circulator
blower motor.
Corrective Actions
Review wiring diagram
to correct polarity.
Verify proper ground.
Correct if necessary.
Check and correct
wiring.
Populate shared data
set using memory
card.
Verify shared data set
is correct for the
specific model.
Repopulate data using
correct memory card, if
required.
Tighten or correct
wiring connection.
Verify continuous
circuit through
inductor. Replace if
open or short circuit.
Check circulator
blower motor. Replace
if necessary
Notes and Cautions
Turn off power prior to
repair.
Turn off power prior to
repair.
Use memory card for
the specific model.
Insert memory card
before turning on
power. Memory card
may be removed after
data is loaded.
Turn off power before
removing memory
card.
Error code will be
cleared once data is
loaded.
Turn off power prior to
repair.
Use memory card for
the specific model.
Insert memory card
before turning on
power. Memory card
may be removed after
data is loaded.
Turn off power before
removing memory
card.
Error code will be
cleared once data is
loaded.
Turn off power prior to
repair.
Replace inductor with
correct replacement
part.
Replace circulator
motor with correct
replacement part.
35

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