Service Manual

Service Procedure VIII

Spark Rod Gap Adjustment and Replacement (Continued)

Spark Rod Gap Inspection

and Adjustment

1. Remove combustion system as described

in Combustion System Removal Procedure

(pg 76).

2. Measure spark gap between the spark rod

and burner tube. Acceptable spark gap is

between 3/16” - 1/4” (see images below).

3. If spark gap is not between 3/16” - 1/4”, the spark rod may be carefully bent by supporting the end near

the ceramic insulator with pliers and bending the end near the burner tube with needle nose pliers (see

image below).

4. Ensure and verify spark gap is between 3/16” - 1/4” after bending.

5. Reinstall the combustion system per Combustion System Replacement Procedure (pg 76) and check

several ignitions to ensure the burner lights smoothly.

WARNING

Spark gap must be set to 3/16” to 1/4”. Failure to set

and verify proper spark gap may result in a delayed

ignition resulting in damage to the water heater.

CAUTION

Use caution while performing these steps to prevent

stressing or cracking the ceramic insulator.

Spark Rod

Burner Tube

Hold spark rod

near ceramic

insulator

Bend spark rod

near burner

tube

Spark Rod