Lennox G1D93BC User Manual

# 45466K003 Page 25
CONTROL SYSTEM DIAGNOSTICS
Failure Codes
Table 5
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 20).
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 5.
Fault Code History Button
The control stores the last five fault codes in memory. A
pushbutton switch is located on the control (see Figure 22
on page 26). 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 G1D93BC Specifications

General

Brand	Lennox
Model	G1D93BC
Category	Furnace
Language	English