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19

After successfully lighting the water heater, allow the 
unit to operate for 15 minutes and check the draft 
hood relief opening for proper draft. Make sure all 
other appliances in the area are operating and all 
doors/windows are closed when performing the draft 
test. Pass a match flame or smoke around the relief 
opening of the draft hood. A steady flame or smoke 
drawn into the opening indicates proper draft.
If the flame flutters or is blown out, combustion 
products are escaping from the relief opening. If this 
occurs, do not operate the water heater until proper 
adjustments or repairs are made to the vent pipe 
system and/or air supply requirements.

1.  At least annually check the base-ring filter for any 

dust or debris that may have accumulated on the 
filter screen. NOTE: If the water heater is located 
in an area that is subjected to lint and dirt, it may 
be necessary to check the base-ring filter more 
frequently. 

2.  Follow the Lighting Instructions to turn off the water 

heater and allow it to cool for 10 minutes before 
attempting to clean the base-ring filter. 

3.  Use a vacuum cleaner with a hose attachment 

to remove any dust or debris that may have 
accumulated on the filter. NOTE: If unable to 
inspect or clean the base-ring filter, follow the 
“Cleaning the Combustion Chamber and Flame-
arrestor” instructions below.  

4.  After the base-ring filter has been cleaned, follow 

the Lighting Instructions to return the water heater to 
service.

1.  Follow procedure outlined in “Removing the 

Manifold/Burner Assembly” (See page 22).

2.  Use a vacuum cleaner/shop vac to remove all 

loose debris in the combustion chamber. Use 
compressed air to clear any dust or debris that 
may have accumulated in the flame-arrestor.

3.  Reassemble following the procedure under 

“Replacing the Manifold/Burner Assembly” (See 
page 21).