Flammable Vapor Sensor Testing - Bradford White HE440S*F Service Manual

Gas Control Disassembly / Assembly (cont'd)
Step 6. Using a slotted screwdriver (or a T-15 torx),
remove the screw (holding the cover on) at the bottom of the gas
control.
Step 7. Depress both tabs on the top of the gas control cover and pull to remove.
Step 8. Disconnect the temperature sensor wire harness
from the gas control board.

Flammable Vapor Sensor Testing

Step 1. Move the gas control power switch to the "OFF"
position.
Step 2. Disconnect
resettable thermal switch (FVS/RTS) harness from the gas
control.
Flammable Vapor Sensor Testing
Slotted screwdriver
Temperature sensor wire
harness
Gas control power
switch
the flammable vapor
FVS/RTS harness
sensor /
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