
42
BLOWER PERFORMANCE DATA
■
Normal furnace
operation.
■
Integrated
control module
diagnostic LED
is flashing
7 flashes.
7 flashes
■
Flame sense
microamp signal
is low.
■
Flame sensor is coated/
oxidized.
■
Flame sensor incorrectly
positioned in burner
flame.
■
Lazy burner flame due to
improper gas pressure
or combustion air.
■
Sand flame sensor if
coated/oxidized.
■
Inspect for proper
sensor alignment.
■
Compare current gas
pressure to rating plate
info. Adjust as needed.
■
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.
■
No furnace
operation
■
Integrated
control module
diagnostic LED
is flashing
8 flashes.
8 flashes
■
Problem with
igniter circuit.
■
Improperly connected
igniter.
■
Bad igniter.
■
Poor unit ground.
■
Poor burner ground.
■
Faulty integrated control
module.
■
Check and correct
wiring from integrated
control module to
igniter
■
Replace bad igniter.
■
Check and correct
furnace ground wiring
■
Replace faulty
integrated control
module.
■
Turn off power
prior to repair.
■
Replace igniter
with correct
replacement part.
■
Replace
integrated control
module with
correct
replacement part.
■
Read precautions
in “Electrostatic
Discharge”
section of
manual.
■
Induced draft
blower runs
continuously.
No furnace
operation.
■
Integrated
control module
diagnostic LED
is flashing
continuously.
Continuous
flashes
■
Polarity of 115-
volt or 24-volt
power is
reversed.
■
Polarity of 115-volt AC
power to furnace or
integrated control
module is reversed.
■
Red and blue wires to
transformer are
reversed.
■
Poor unit ground.
■
Review wiring diagram
to correct polarity.
■
Verify proper ground.
Correct if necessary.
■
Reverse red and blue
wires connected to
transformer.
■
Turn off power
prior to repair.
Symptoms of
Abnormal
Operation
Associated
LED Code
Fault Description Possible Causes
Corrective Actions
Notes and
Cautions
Blower Performance Data
CFM and Temperature Rise vs. External Static Pressure
Model—Heating
Speed as Shipped
Motor
Speed
Tons
AC at
0.5"
ESP
External Static Pressure (Inches Water Column)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
CFM
Rise CFM
Rise CFM
Rise CFM
Rise CFM
Rise CFM CFM CFM
WGFM1950453BXA
(MED-HI)
High
3.0
1,352
29
1,318
30
1,260
31
1,202
33
1,128
35
1,044 955
853
Med
2.5
1,214
32
1,172
34
1,123
35
1,064
37
1,012
39
938
859
741
Med-Lo
2.0
997
40
994
40
960
41
923
43
884
45
817
741
611
Low
1.5
757
52
753
52
734
54
704
56
674
59
620
524
438
WGFM1950703BXA
(MED-HI)
High
3.0
1,449
41
1,409
42
1,326
45
1,273
47
1,201
49
1,194 1,136 1,018
Med
2.5
1,192
50
1,172
51
1,141
52
1,094
54
1,046
57
973
904
793
Med-Lo
2.0
981
61
962
62
943
63
917
65
888
67
830
764
665
Low
1.5
750
79
730
81
714
83
692
86
657
90
620
570
502