Bradford White Water Heater M4TW40T6FSX

Cast Iron Burner Air Shutter Adjustment

Take necessary precautions to prevent personal injury

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

Loosen the air shutter nut and adjust the air shutter for proper burning

Tighten the air shutter nut after adjustment

Close inner door and observe burner operation. Is the burner operating as adjusted?

Repeat air shutter adjustment if necessary, compensating for proper burner operation with inner door closed

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.

See pages 29 & 30 for gas control input & output testing.

Position gas valve power switch to the “OFF” position and disconnect thermal well harness from gas control.

Determine the resistance of thermal well sensors 1 & 2 using a multi-meter set to the Ohms setting.

Insert one meter probe into center wire position of thermal well connector, insert the second probe into either of the outside wire positions.

Alternate the probe on the outside position to the opposite outside wire position.

See page 25 to obtain water temperature.

Are thermal well resistance values correct?

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?

If blower does not energize within 2 minutes, does it run for 30 seconds and shut down?

Is there 115 VAC at wall outlet?

Repair or replace power cord if damaged.

Anode Inspection and Replacement

WARNING — Water Heater components and stored water may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury

Position on/off switch of gas control valve to the “OFF” position and unplug water heater from wall outlet

Turn off cold water supply to water heater

Connect hose to drain valve of water heater and route to an open drain

Open a nearby hot water faucet to vent water heater for draining

Open drain valve of water heater and allow water heater to drain to a point below the outlet connection nipple

Disconnect outlet nipple from plumbing system

Remove outlet nipple/anode from the water heater using an appropriate tool such as a pipe wrench