Lennox G1N80BU User Manual

# 45464K003Page 18
Failure Codes
Table 4
CONTROL SYSTEM DIAGNOSTICS
Troubleshooting
The following visual checks should be made before
troubleshooting:
1. Check to see that the power to the furnace and the
blower control board is on.
2. The manual shutoff valves in the gas line to the
furnace must be open.
3. Make sure all wiring connections are secure.
4. Review the Sequence of Operation (see page 15).
Start the system by setting the thermostat above the room
temperature. Observe the system’s response. Then use the
information provided in this section to check the system’s
operation.
The furnace has a built-in, self-diagnostic capability. If a
system problem occurs, a fault code is shown by an LED
on the control board. The control continuously monitors its
own operation and the operation of the system. If a failure
occurs, the LED will indicate the failure code. The flash
codes are presented in Table 4.
REPAIR PARTS
The following repair parts are available from the local
distributor. When ordering parts, include the complete
furnace model number and serial number which are
printed on the rating plate located on the furnace.
Control Group
Transformer
High limit control
Auxiliary limit (if used)
Gas valve
Ignition/blower control board
Flame sensor
Heat Exchanger Group
Heat exchanger
Flue box cover
Blower Group
Blower housing assembly
Blower wheel
Blower mount
Burner Group
Gas manifold
Main burner orifices
Accessories
ALPKT572 Natural Gas to Propane Conversion Kit
ANGKT557 Propane to Natural Gas Conversion Kit
AFILTHA7 Single Side Filter Frame Kit
AFILT524 Side Return Filter Kit (Upflow Models)
AFILT525 Return Filter Kit (Counterflow Models)
AFILT529 Bottom Return Filter Kit
ATWIN579 Twinning Kit
ABASE511 Combustible Floor Base (14.5" cabinets)
ABASE512 Combustible Floor Base (17.5" cabinets)
ABASE568 Combustible Floor Base (21.0" cabinets)
ABASE569 Combustible Floor Base (24.5" cabinets)
Pressure switch
Blower door interlock switch
Combustion blower assembly
Flame rollout protector switch
Hot surface igniter
Combustion blower transition
Blower motor mount
Blower motor capacitor
Main burners
Fault Code History Button
The control stores the last five fault codes in memory. A
pushbutton switch is located on the control (see Figure 18).
When the pushbutton switch is pressed and released, the
control flashes the stored fault codes. The most recent fault
code is flashed first; the oldest fault code is flashed last.
To clear the fault code history, press and hold the pushbutton
switch in for more than 5 seconds before releasing.
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Lennox G1N80BU Specifications

General

Brand	Lennox
Model	G1N80BU
Category	Furnace
Language	English