TECHNICAL SERVICE DEPARTMENT
Technical Service Bulletin
1-800-432-8373
How to Replace the Thermal Release Device (TRD)
Rheem Guardian System
Technical Competence, Product Confidence
Page 2 of 4
1446 How to Replace the Thermal Release Device (TRD).docx
off gas supply to water heater. Turn gas valve to
OFF. (Note your gas control may be different than shown
here.)
2. Remove jacket door to combustion chamber.
3. Remove the four tamper resistant screws at the corners of
the burner. You will need a #20 size TORX head tool.
Disconnect main burner supply tube, pilot supply tube
and piezo ignition wire.
4. Remove burner access door. Remove the old door gasket.
Clean metal surfaces.
(Gasket will be replaced during reinstallation of inner door.
See gasket shipping package for more replacement
instructions.)
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