Bradford White Water Heater M4TW50T6FSX

Burner Inspection and Air Shutter Adjustment

Ensure inner door and burner components are cool before inspection

Inspect pilot flame for stability

Check that the main burner lights smoothly from pilot

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

Ensure main burner is free from debris accumulation

Cast Iron Burner Air Shutter Adjustment

Ensure safety precautions are taken to prevent personal injury from hot components.

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

Rotate the air shutter to close the opening in the burner.

Slowly rotate the air shutter open until flame becomes as blue as possible with a minimum of yellow tips.

Is the flame blue with a minimum of yellow tips?

Check for noisy burner operation or soot formation.

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?

If no continuity, replace switch.

Reconnect wire leads and observe heater operation. Do exhaust gas temperatures rise to or above 165°F?

If exhaust gas temperatures rise to or above 165°F, do switch contacts open?

Simulated Resistive Device Testing

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

Disconnect simulated resistive device from gas control.

Enter the resistance of the simulated resistive device (in ohms).

Is the resistance within 25,000 ohms and 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.