Bradford White EF120T4003NA3 Service Manual page 34

Blower Replacement Procedure
1. Position main power switch to OFF.
2. Disconnect (unplug) water heater from 120 volt power source.
3. Turn OFF gas supply to water heater.
4. Unlatch and remove surround cover from top of heater.
5. Disconnect the 2 wire harnesses from blower.
6. Disconnect intake vent and gas supply from gas valve assembly.
7. Remove the 3 gas valve mounting screws (T40 Torx bit) located on the venturi mounting flange.
8. Remove the 4 blower flange mounting screws (5/32" Allen wrench) and remove blower from transition flange.
9. Remove any residual gasket material from venturi mounting flange and transition flange.
10. Install new blower with new gasket provided. Secure blower in place using screws from Step 8.
11. Reconnect gas valve assembly to blower with new gasket provided. Secure gas valve in place using screws from
Step 7.
12. Reconnect intake vent and gas line to gas valve assembly and check for gas leaks. Repair any leaks found.
13. Reconnect the 2 wire harnesses to blower assembly, restore 120 volt power supply, and gas supply to water
heater. Confirm proper operation following the lighting instructions on the lighting instruction label, or the lighting
instructions located in the Installation and Operating Manual.
14. Replace surround cover on top of water heater.
120T400
34
Service Procedure V:
Blower Testing and Replacement
120 volt potential exposure. Use caution
making voltage checks to avoid personal
120T500
34
WARNING
injury.