10
Sequence of Operation
Lockout Conditions
The system will go into lock out mode for the following reasons:
1. ERROR CODE 110
a. Control board will go into “Soft Lockout” if the main burner cannot be lit or fails to prove flame after 3
ignition trials. The water heater display indicates a lockout condition by showing an error code number
110 with “Service Needed” in the control display window. Refer to error codes in the diagnostic section of
this Service Manual. In a “Soft Lockout” condition, the control will wait for 15 minutes and then make 3
more attempts to light the main burners. Soft lockout reset is accomplished by depressing the lower right
button under “Reset” for 3 seconds.
2. ERROR CODE 80
a. If the top of the tank should exceed 207°F, then the high limit control will shut off the burner and the water
heater will go into a “Hard Lockout.” Error code 80 will be shown in the water heater display. The control
can only be reset in the “Service Mode,” which is detailed in the “Troubleshooting” section of this Service
Manual.
3. ERROR CODE 67
a. If the vent safety switch located on the draft hood should open, the gas valve will close, the blower will
post-purge and error code 67 will appear on the display. The lockout condition will reset once the
problem is corrected and the switch reset. Refer to “Vent Safety Switch Testing and Replacement” in this
Service Manual.
CONNECTION/WIRING DIAGRAM
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