Service Manual

Use caution while performing these steps to

prevent stressing or cracking the ceramic insulator.

CAUTION

Spark gap must be set from 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.

WARNING

Service Procedure VII:

Spark Rod Gap Adjustment and Replacement

Spark Rod Gap Inspection and Adjustment

1. Remove combustion system as described in

Combustion System Removal Procedure, pg 27.

2. Measure spark gap between the spark rod and burner

tube. Acceptable spark gap is from 3/16" to 1/4" (see

image below).

3. If spark gap is not between 3/16" to 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. Re-measure and verify the spark gap is between 3/16" to 1/4" after bending.

5. Verify the integrity of all gaskets and replace where required.

Reinstall the combustion system per Combustion System Replacement Procedure (pg 27) and check

several ignitions to ensure the burner lights smoothly.

Burner Tube

Spark Rod

Hold spark rod

near ceramic

insulation

Bend

spark rod

near

burner

tube