Bradford White Water Heater M1TW40S10FCX

Gas Control & Thermal Well Removal From Water Heater

Position gas valve power switch to the “OFF” position and unplug heater from power supply.

Drain heater to a point below the gas control level.

Turn off gas supply to water heater and disconnect gas piping from gas control.

Disconnect wire harnesses and burner assembly from gas control.

Remove gas control & thermal well by rotating flats of Thermal Well counter clockwise (1-5/16" wrench).

Gas Control Removal From Thermal Well

Position gas control power switch to the “OFF” position and unplug water heater from power supply.

Turn off gas supply to water heater and disconnect gas piping from gas control.

Simulated Resistive Device Testing

Position power switch on gas control to the “OFF” position.

Disconnect simulated resistive device from gas control.

Check resistance of simulated resistive device using a multi-meter set to the ohms setting.

Is the resistance within the acceptable range of 25,000 ohms to 45,000 ohms?

Replace simulated resistive device if resistance is outside the acceptable range.

Position gas control power switch to the “OFF” position and unplug heater from wall outlet.

Turn off gas supply to water heater.

Remove outer jacket door and slide inner door open from left to right.

Disconnect pilot tube (7/16 wrench) and feedline (¾ wrench) from gas control.

Disconnect igniter/flame sensor wire from gas control.

Remove burner assembly from combustion chamber.

Thoroughly inspect burner surface area and burner port area and remove any loose debris.

For cast iron burners, inspect for any debris build up inside burner casting.

Position gas control power switch to 'ON' position and adjust control to call for heat.

Remove the three screws from control access cover on blower assembly and remove cover.

Does blower energize within 2 minutes?

Does blower energize after 2 minutes, run for 30 seconds and shut down?

Is there 115 VAC at wall outlet?

Disconnect pressure switch tubing from blower.

Connect manometer to pressure tap of blower.

Burner Inspection and Air Shutter Adjustment

Check for debris accumulation on the main burner

Verify main burner lights smoothly from pilot

Ensure main burner burns with a blue flame with minimal yellow tips