Bradford White Water Heater EF100T250E3NA2

Service Procedures VI — Exhaust Pressure Switch / Blocked Vent Pressure Switch Testing

Does the purge LED or error code clear within 5 minutes?

Check exhaust collector pressure at the pressure tap with a manometer

Inspect the combustion system area and control panel

Exhaust/Blocked Vent Pressure Switch Replacement

Slide back the rubber escutcheon and remove the service panel access cover

Disconnect the silicone tubing and wire leads from the pressure switch

Service Procedure XIV — Anode Inspection and Replacement

Turn off the water supply and drain the water heater

Disassemble the heater for access to anodes and flue baffles

Locate and remove the anode rods using a 1-1/16 in. hex socket

Visually inspect each anode rod

Apply thread sealing tape or compound and reinstall the anode rods

Restore the water supply and check for leaks

Reinstall the collector insulation and control panel

Service Procedure VIII — Flame Sensor Testing & Replacement

Check for a minimum of 1 microamp during the 1.5-second flame-proving period.

Enter the microamp reading during the flame-proving period.

Is the flame-sensing circuit okay?

Enter the 24VAC reading at the ignition module/control board flame-establishing terminals.

Is the expected 24VAC present at the ignition module/control board?

Call technical support if 24VAC is absent.

Check for continuity to ground with the sensor disconnected.

Service Procedure III — Burner Tube Inspection & Replacement

WARNING — Heater components can be hot during this procedure; take precautions to avoid injury.

Turn the main power switch off and unplug the water heater, then turn off the gas supply.

Remove the surround cover, then disconnect the gas connection, PVC venting, wire harness, and silicone tubing from the gas valve.

Disconnect the wire harness from the blower assembly.

Remove the two screws holding the hot surface igniter and flame sensor and carefully remove them (for Direct Spark Ignition models, remove the spark rod bracket screws and spark rod instead).

Remove the four nuts holding the burner transition, lift the blower/gas valve/transition assembly off, and set the gasket aside.

Remove the burner tube from the burner mounting insert.

Service Procedure VII — Hot Surface Igniter Testing & Replacement

WARNING — 120-volt potential exposure; the igniter may be too hot to handle, so use caution.

Igniter's cold resistance check

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)

Is voltage present across the ignition module's igniter terminals?