Pilot Testing, Cleaning And Replacement - Bradford White TW Series Service Manual

Tw series through-the-wall gas water heaters troubleshooting guide and instructions for service

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Table Of Contents

Table of Contents

Pilot Inspection, Testing and Replacement

Step 1.

Position gas control power switch to the

"OFF" position and unplug heater from wall

outlet.

Step 2.

Turn off gas supply to water heater.

Step 3.

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

right.

Step 4.

Disconnect pilot tube nut (7/16 wrench) and feedline nut

(¾ wrench) from gas control.

Step 5.

Disconnect igniter/flame sense wire from gas control.

Step 6.

Remove burner assembly from combustion chamber.

Step 7.

Remove pilot assembly from feedline (¼" nut driver).

Step 8.

Visually inspect igniter/flame sense wire for damage. Replace

pilot if damage is found.

Step 9.

With a multi-meter set to the ohms setting, check continuity

through igniter/flame sense wire. Replace pilot if no continuity.

Step 10.

Visually inspect igniter/flame sense electrode for deterioration.

Replace pilot as necessary. Electrode should not be in contact

with pilot hood, If so, carefully adjust electrode to a gap

distance of 3/32" (.09) from pilot hood.

Step 11.

Visually inspect igniter/flame sense electrode for oxidation

build up. Carefully clean any oxidation using very fine emery

cloth.

Step 12.

Visually inspect pilot tubing for kinks or cracks. If damage is

found replace pilot.

Step 13.

Inspect pilot tubing and pilot orifice for blockage:

a) Remove ferrule nut from bottom of pilot assembly (7/16" wrench).

b) Remove pilot tube and pilot orifice.

c) Inspect pilot tubing and pilot orifice for blockage. Clean

or replace as necessary.

Step 14.

Reassemble pilot and install to feedline. Reinstall burner assembly to water heater. Restore gas supply

and check for gas leaks.

Step 15

To resume operation follow the instruction located on the lighting instruction label or the lighting

instruction located in the installation and operating manual.

TTW SERVICE PROCEDURE II