Bradford White Water Heater EF100T300E3NA2

Service Procedure XII — Intake Pressure Testing (models prior to serial "CF" only)

Check continuity through the normally closed intake pressure switch if the blower does not energize

Replace the intake pressure switch if faulty

Refer to vent safety switch, exhaust pressure switch, or blower testing procedures if intake pressure switch is not faulty

Check continuity through the switch if the purge LED does not illuminate within the expected time

Confirm the inlet tube pressure tap reads at least -1.2 in. W.C. using a manometer

Remove the hose from the intake pressure switch and restart the heater to see if the purge LED illuminates

Isolate the heater from the intake vent system and restart again to isolate a switch versus vent-system fault

Check whether the intake vent system is obstructed

Service Procedure I — Thermostat Circuit Testing

Unplug electrical power to the water heater

Check continuity of the wire harness to the sensor; resistance should be close to 0 ohms

Is the resistance of the wire harness to the sensor below 0.5 ohms?

Replace the harness if resistance exceeds 0.5 ohms or wires show damage

Check sensor resistance against the temperature/resistance table

Restore power and run the heater through a heating cycle to verify proper operation

Service Procedure VII — Hot Surface Igniter Testing & Replacement

Be aware of 120-volt potential exposure and handle the igniter with caution as it may be too hot.

Check the igniter's cold resistance

Is the igniter's cold resistance under 150 ohms?

Replace the hot surface igniter if resistance is not under 150 ohms

Check for 120VAC across the ignition module's igniter terminals during the warm-up period (igniter LED lit)

Service Procedure XIV — Flue Baffle Inspection and Replacement

Warning: Heater components can be hot during this procedure; take precautions to avoid injury.

Disassemble the heater per the Disassembly Procedure for Access to Anodes & Flue Baffles.

Remove the flue baffles with pliers.

Visually inspect the baffles for oxidation and missing restrictors.

Replace any baffle with deteriorated oxidation or missing restrictors.

Reinstall the flue baffles once inspection or replacement is complete.

Reinstall the collector cover per the Collector Cover Installation Procedure.

Service Procedure V — Blower Testing & Replacement

Warning: 120-volt potential exposure; use caution making voltage checks.

Confirm the blower energizes when the thermostat calls for heat

Check for 120VAC across the terminal-block black and white wires

Check for 120VAC at the ignition module/control board and blower wiring

Repair or replace the harness or blower as indicated

Does the blower energize but seem weak?

Check amp draw on the black blower-motor lead (should read 0.6–3.0 amps)

Confirm the blower wheel is secure on the motor shaft