Lennox G32 SERIES Unit Information

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PROBLEM 3: UNIT FAILS TO FIRE IN THE HEATING MODE, COMBUSTION AIR BLOWER DOES NOT
ENERGIZE (CONT.).
Condition Possible Cause Corrective Action/Comments
3.3
− Unit operates with a cooling and con
tinuous fan demand.
− Combustion air blower will not start
with a Heating demand.
− Diagnostic lights flash the pressure
switch failure code 2 5 minutes after
3.3.1
Miswiring of furnace or improper con
nections to combustion air blower.
ACTION 1 − Check for correct wiring and loose
connections. Correct wiring and/or replace any
loose connections.
switch failure code 2.5 minutes after
heating demand.
LED#1−Off,
LED#2−Slow Flash
3.3.2
Combustion air blower failure.
ACTION 1 − If there is 120V to combustion air
blower and it does not operate, replace combus
tion air blower.
PROBLEM 4: UNIT FAILS TO FIRE IN THE HEATING MODE, COMBUSTION AIR BLOWER
ENERGIZES, IGNITOR IS NOT ENERGIZED.
Condition Possible Cause Corrective Action/Comments
4.1
− Unit operates with a cooling and
continuous fan demand.
− Combustion air blower energizes
with a heating demand
4.1.1
Pressure switch does not close due
to incorrect routing of the pressure
switch tubing.
ACTION 1 − Check that the pressure switch tub
ing is correctly routed. Correctly route pressure
switch tubing.
with a heating demand.
− Diagnostic lights flash the pressure
switch failure code 2.5 minutes after
heating demand.
4.1.2
Pressure switch does not close due
to obstructions in the pressure tubing.
ACTION 1 − Remove any obstructions from the
pressure tubing and/or taps.
g
LED#1−Off
4.1.3
Pressure switch tubing damaged
ACTION 1 − Check pressure switch tubing for
leaks. Replace any broken tubing.
LED#1 Off
LED#2−Slow Flash
4.1.4
Condensate in pressure switch tub
ing.
ACTION 1 − Check pressure switch tubing for
condensate. Remove condensate from tubing.
Check that the condensate tubing is located cor
rectly.
4.1.5
Pressure switch does not close due
to a low differential pressure across
the pressure switch.
ACTION 1 − Check the differential pressure
across the pressure switch. This pressure
should exceed the set point listed on the
switch.
ACTION 2 − Check for restricted inlet and ex
haust vent. Remove all blockage.
ACTION 3 − Check for proper vent sizing and
run length. See installation instructions.
4.1.6
Wrong pressure switch installed in the
unit, or pressure switch is out of cal
ibration.
ACTION 1 − Check that the proper pressure
switch is installed in the unit. Replace pressure
switch if necessary.
4.1.7
Miswiring of furnace or improper con
nections at pressure switch.
ACTION 1 − Check for correct wiring and loose
connections. Correct wiring and/or replace any
loose connections.
4.1.8
Pressure switch failure.
ACTION 1 − If all the above modes of failure have
been checked, the pressure switch may have
failed. Replace pressure switch and determine if
unit will operate.

Lennox G32 SERIES Specifications

General

Brand	Lennox
Model	G32 SERIES
Category	Furnace
Language	English