Bradford White EF120T4003NA3 Service Manual page 10

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 digital display indicates a lockout condition by showing error code 110 with "Service
Needed" on the control board's digital display. 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 temperature at 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 on the control board's
digital display. The control board can only be reset in the Service Mode, which is detailed in the
Troubleshooting section of this Service Manual (pg 11).
3. ERROR CODE 67
a. If the exhaust terminal becomes blocked or the condensate elbow fails to drain condensate, the normally
closed exhaust pressure switch will open, the gas valve will close, and error code 67 will appear on the
digital display. When the condition is corrected, the error code will disappear, and the water heater will
resume normal operation. No resetting of the control board is needed for the pressure switch error code.
b. If the vent safety switch located near the exhaust pressure switch should open, the gas valve will close, the
blower will post-purge, and error code 67 will appear on the control board's digital display. The lockout
condition will reset once the problem is corrected and the switch is reset. Refer to Vent Safety Switch
Testing and Replacement in this Service Manual (pg 42).
c. The pressure switch and temperature switch are wired in series. As a result, the water heater will not
function unless both switches are operational.
10
Sequence of Operations
Connection/Wiring Diagram
10