Bradford White Water Heater M4XRTW50T6FBN

Burner Inspection and Air Shutter Adjustment

Ensure inner door and burner components are cool before inspection

Inspect pilot and main burner for proper operation and debris accumulation

Is the water heater vent within the allowable vent length?

Measure the gas pressure to ensure it is within specification

Is the pilot flame fully engulfing the spark/flame sensor?

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

Position gas control power switch to the 'OFF' position.

Unplug blower power cord from wall outlet.

Disconnect vent system from exhaust adapter on top of blower.

Remove exhaust adapter from blower and retain for use on new blower.

Remove the three blower mounting screws using a ¼" nut driver.

Remove blower with gasket from water heater.

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

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

Carefully remove pressure switch from blower housing.

Disconnect wire leads from pressure switch.

Use a multi-meter set to the ohms setting and check across pressure switch terminals with blower off.

Are switch contacts open? (no electrical continuity)

Position gas valve power switch to the “ON” position and adjust thermostat to call for heat.

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.