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Integrated Control
TERMINAL DESIGNATIONS
HUM -Humidifier (120VAC)
Line - Input (120VAC)
XFMR - Transformer (120VAC)
Cont - Continuous blower
EAC - Indoor Air Accessory (120VAC)
Cool - Cool Speed (120VAC)
Park 1 - Dead terminal for alternate speed tap
Park 2 - Dead terminal for alternate speed tap
HI Heat - High heat speed
FIGURE 62
TABLE 11
Diagnostic Codes Red LED
LED O
No power to control or control hard-
ware fault detected.
LED On
Normal operation.
1 Flash
Flame present with gas vavle de-en-
ergized.
2 Flashes
Pressure switch closed with combus-
tion air inducer de-energized.
3 Flashes
Low-re pressure, rollout or limit
switch open.
4 Flashes
Primary limit switch open.
5 Flashes
Not used
6 Flashes
Pressure switch cycle lockout.
7 Flashes
Lockout, burners fail to light.
8 Flashes
Lockout, burners lost ame too many
times.
9 Flashes
Line voltage polarity incorrect.
Troubleshooting
Make the following visual checks before troubleshooting:
1 - Check to see that the power to the furnace and the
integrated ignition/blower control is ON.
2 - The manual shuto 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.
Start the system by setting thermostat above room tem-
perature. Observe system response. Then use the infor-
mation provided in this section to check the system oper-
ation.
The furnace has a built-in, self-diagnostic capability. If a
system problem occurs, a fault code is shown by a red
LED on the control. 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 ash
codes are presented in table 11.
Fault Code History Button
The control stores the last ve fault codes in memory. A
pushbutton switch is located on the control. When the
pushbutton switch is pressed and released, the control
ashes the stored fault codes. The most recent fault code
is ashed rst; the oldest fault code is ashed last. To
clear the fault code history, press and hold the pushbutton
switch in for more than 5 seconds before releasing.
High Heat State LED
A green LED is provided on the control board to indicate
high heat state (see Table 12).
CFM LED
An amber LED is provided on the control board to display
CFM. To determine what CFM the motor is delivering at
any time, count the number of times the amber LED ash-
es. Each ash signies 100 CFM; count the ashes and
multiply by 100 to determine the actual CFM delivered (for
example: 5 ashes x 100 = 500 CFM).
TABLE 12
High Heat State Green LED
LED Status
DESCRIPTION
LED O
No demand for high heat
LED On
High heat demand, operating normally
LED Flashing
High heat demand, high pressure switch
not closed
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