Whirlpool WFCT, Installation Instructions Manual

27

TROUBLESHOOTING

Furnace Fails to Operate Properly

Review “Sequence of Operation” and visually inspect the 
following before troubleshooting:

■

Is the integrated ignition/blower control board and power to 
the furnace on?

■

Is the blower compartment door securely closed?

■

Are the manual shutoff valves in the gas line to the furnace 
open?

■

Are all wiring connections secure?

Start the system by setting thermostat above the room 
temperature. Observe system response. Then use the 
information provided in this section to check the system 
operation.

Fault Code History Button

The control stores the last 5 fault codes in memory. A push-
button switch is located on the control. When the push-button 
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 push-button switch in for more than 5 seconds 
before releasing.

Failure Codes

The furnace has a built-in, self-diagnostic capability. If a system 
problem occurs, a failure code is indicated by the LED on the 
ignition 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. 

IMPORTANT: Do not remove the blower compartment door or 
turn off the power to the furnace since either action will clear the 
control’s memory of the fault.

1. Start the system by setting the thermostat above the room 

temperature.

2. Observe the system’s response. 

3. Use the information provided in this section to check the 

system’s operation.   

WARNING

Electrical Shock Hazard

Disconnect power before servicing.

Replace all parts and panels before operating.

Failure to do so can result in death or electrical shock.

Failure Codes Chart

LED Status

Fault Description

LED Off

No power to control or control hardware fault 
detected

LED On

Normal operation 

1 Flash

Flame present with gas valve off

2 Flashes

Pressure switch closed with inducer off

3 Flashes

Pressure switch open with inducer on

4 Flashes

High limit switch open

5 Flashes

Rollout switch open

6 Flashes 

Pressure switch cycle lockout

7 Flashes

Lockout due to no ignition

8 Flashes

Lockout due to too many flame dropouts

9 Flashes

Incorrect line voltage phasing