Bradford White EF Series Service Manual page 16

Thermostat Potentiometer Replacement Procedure
Step 1. Position main power switch to "OFF"
Step 2. Disconnect (unplug) water heater from
120 volt power source.
Step 3. Un-latch and remove top surround cover
from top of heater.
Step 4. Loosen set screw of adjusting
knob (small blade screw driver)
and remove adjusting knob
from potentiometer. (see photo 8)
Step 5. Remove retaining nut (½" wrench)
and washer from potentiometer.
(see photo 9)
Step 6. From inside of surround area, remove potentiometer
with gasket from side of surround. Notice how indexing
tab on potentiometer assembles into locating hole of
surround. (see photo 10)
Step 7. Disconnect potentiometer wire leads.
(see photo 11)
Step 8. Install new potentiometer with gasket into side of surround. Be sure to assemble with
indexing tab inserted into locating hole on side of surround (see photo 10).
Step 9. Reconnect wires to potentiometer. Note: Wire leads are interchangeable with either wire.
Step 10. Restore 120 volt power supply to water heater and confirm proper operation following
the lighting instructions on the lighting instruction label or the lighting instruction located
in the installation and operating instruction manual.
Step 11. Replace surround cover on top of heater.
Page 16
SERVICE PROCEDURE EF-I
Thermostat Circuit Testing and Replacement
Indexing
tab
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
10
Locating
hole
Temperature
8
adjusting knob
11
Page 16
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