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RESIDENTIAL GAS, NON POWER VENTED, WATER HEATER
SERVICE HANDBOOK
State Water Heater Technical Training Department
© 2004 Ashland city, TN
21
The three seals on the inner door should be checked every time any service is performed. The
sight glass should be checked to insure it is not damaged or missing. The pilot tube and
thermocouple routing should be straight (not bent at an angle close to the surface of the seal) as
it passes through the pilot assembly seal.
A "five point inner door seal inspection" is outlined below:
Five point inner door seal inspection:
1. Inner door gasket condition and fit.
2. Main burner tube seal condition and fit.
3. Pilot assembly seal condition and fit.
4. Sight glass, condition; present, not broken or cracked.
5. Straight routing of the thermocouple and pilot burner tube through the pilot assembly
seal.
These are all critical to maintaining the C3 TECHNOLOGY integrity of the combustion
chamber.