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TROUBLESHOOTING
If the unit does not operate in the cooling mode, check the
following:
• Is the thermostat operating properly?
• Is the blower compartment doors in place?
• Is the furnace disconnect closed?
• Has the circuit breaker tripped or did any of the control board
fuses burn open? NOTE: There are 2 fuses, one on the
control board (3-amp) and one in a fuse holder (1.5-amp)
to the right of the control board.
• Is the gas turned on?
• Is the gas turned on?
• Are any manual reset switches open?
• Is the filter dirty or plugged?
• Is the flame sensor coated? (Remove and clean with steel
wool. New gasket is required) See Cleaning of Flame Sensor
sectionon
page
17.
• Are all the LED's on the furnace control board constantly
ON? If not, refer to
Table 3
12 (page
24)) to determine fault condition.
IMPORTANT NOTE: The furnace will lock out after 5 failed
attempts for ignition and will try again every hour if the call
for heat remains.
• If the inducer blower is operating and items above have been
verified, check the limit switch circuit and reset if necessary.
See
Figure 14 (page 29)
• If the furnace operates when the limit switch circuit is reset,
contact a qualified service technician to identify and repair
the problem.
• If the furnace still doesn't operate, check the flame roll-out
switch and reset if necessary. See
location.
• If the furnace operates when the flame rollout switch is reset,
contact a qualified service technician to identify and repair
the problem.
18
or the wiring diagram
(Figure
for component location.
Figure 14
for component
DIAGNOSTIC DESCRIPTION
Control Fault (No Power)
L1/Neutral Polarity Fault
1 Hour Lockout
Normal Operation
Pressure Switch Closed Fault
Pressure Switch Open Fault
Open Limit Switch Fault
DIAGNOSTIC DESCRIPTION
Low Flame Sensor Signal
Flame Present
Table 3. Diagnostic Codes
GREEN LED
RED LED
Off
Off
Flash
Flash
Alternating Flash
On
On
On
Flash
Flash
On
Flash
Off
YELLOW LED
Continuous Flash
On
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