Bradford White EF Series Service Manual page 17

Thermostat Sensor (Thermister) Replacement Procedure
Step 1. Position main power switch to "OFF"
Step 2. Disconnect (unplug) water heater from
120 volt power source.
Step 3. Drain heater down to a point below
the top of the tank.
Step 4. Un-latch and remove top surround cover
from top of heater.
Step 5. Fold back insulation just in front of burner to expose temperature sensor
(see photo 12).
Step 6. Disconnect temperature sensor from
harness (see photo 13).
Step 7. Remove temperature sensor (1-1/16" hex, deep well socket) from heater.
Note: Using a deep well socket will allow room inside socket
Step 8. Apply Teflon tape or applicable thread lubricant to threads of new sensor. Install new
thermostat sensor and Connect to wire harness from step 6.
Step 9. Fold insulation back into place. Be sure there are no wires in contact with burner.
Step 10. Restore 120 volt power supply and water supply to water heater, check and repair any
leaks found. 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.
SERVICE PROCEDURE EF-I
Thermostat Circuit Testing and Replacement
13
Disconnect sensor
from harness
for sensor connector and wires.
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
12
Insulation folded
back to expose
temperature sensor
Page 17
Page 17