Bradford White Water Heater M2TW50T6FCX

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.

Remove blower with gasket from water heater.

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?

Action based on continuity check

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

Action based on exhaust gas temperature rise

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?

Blower Temperature Switch Replacement

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

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

Locate blower temperature switch.

Disconnect red and yellow wire leads from switch.

Snip the retaining lug from the blower housing to allow removal of temperature switch.

Remove switch from blower housing.

Install new switch and ensure it is properly seated in mounting area.

Reconnect red and yellow wires to new switch.

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 (alternating bright/dim)?

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 issues if no continuity