Bradford White Water Heater M2TW65T6FBN

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.

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.

Remove three screws from control access cover on blower and remove cover

Is there 10 to 13 VAC between red wire leading to blower temperature switch and green ground wire?

Is LED on gas valve flashing the “heartbeat” code?

Is there 10 to 13 VAC between yellow wire leading from pressure switch and green ground wire?

Is there continuity through blower temperature switch?

Check for loose or broken wire connection at switch terminals

Determine cause of blower temperature switch activation and correct

Blower Temperature Switch Testing

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

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

Locate blower temperature switch.

Is there continuity between the switch terminals using a multi-meter set to the ohms setting?

Do exhaust gas temperatures rise to or above 165°F?

Do switch contacts open when exhaust gas temperatures rise to or above 165°F?

Common causes for high exhaust temperature