Bradford White EF120T4003NA3 Service Manual page 45

Vent Safety Switch Testing and Replacement
Vent Safety Switch Replacement Procedure
1. Position main power switch to OFF.
2. Loosen the adhesive backed rubber escutcheon from service panel access cover. Slide the escutcheon back
along the exhaust pipe to allow for removal of cover (see images below).
3. Remove screws from service panel access cover (1/4" nut driver) and remove the cover from the water heater
(see images below).
4. Disconnect grey wire leads from vent safety switch (see image below).
5. Remove the 2 switch mounting screws (Phillips screwdriver) and remove switch from heater.
6. Install a new switch using screws from Step 5.
7. Reconnect the wire leads.
Note: Wire leads are interchangeable with either switch terminal.
8. Restore 120 volt power supply to water heater and confirm proper operation following the lighting instructions
on the lighting instruction label, or the lighting instructions located in the Installation and Operating Manual.
9. Reinstall the service panel access cover and rubber escutcheon.
Service Procedure XI:
Vent safety switch
Service panel access covers
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