Bradford-White Corp MI30T*F Thermocouple Replacement White Rodgers/Robertshaw Gas Valve

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SERVICE PROCEDURE RG-II

Thermocouple/Thermopile Testing and

Replacement

OPEN CIRCUIT THERMOCOUPLE TESTING (White Rodgers/Robertshaw Gas Valve)

Step 1. Disconnect thermocouple from combination thermostat/gas valve.

Step 2. Using a multimeter capable of measuring millivolts, connect one alligator clip to the end ball or contact portion of the thermocouple, and the other alligator clip to copper portion of the thermocouple.

Step 3. Following the lighting instruction label on the heater, proceed to light the pilot and allow to operate for three minutes. It will be necessary to hold the pilot button down continuously throughout this test. A reading of 20 to 30 millivolts indicates good thermocouple output.

THERMOCOUPLE REPLACEMENT (White Rodgers/Robertshaw Gas Valve)

Step 1. Turn off gas supply to water heater. Rotate knob of combination thermostat/gas valve to “OFF” position.

For White Rodgers Control, depress knob slightly and rotate clockwise to the “OFF” position.

For Robertshaw Control, rotate knob clockwise to the “OFF” position.

Step 2. Remove outer jacket door.

Step 3. Remove right side of inner door per SERVICE PROCEDURE RG-I, steps 3a through 3c.

Step 4 Disconnect thermocouple from combination thermostat/gas valve. Locate other end of thermocouple inside of combustion chamber and remove from pilot bracket. Pull firmly pulling away from the pilot assembly.

Step 5. Install new thermocouple into pilot bracket making certain the thermocouple is fully engaged into the pilot bracket. Position thermocouple against left side inner door flange at its original position. Connect other end of thermocouple to combination thermostat/gas valve (finger tight + ¼ turn).

Step 6. Inspect inner door gasket per SERVICE PROCEDURE RG-I, Step 4.

Step 7. Install right side inner door per

SERVICE PROCEDURE RG-I, Step 10 through Step 13

Thermocouple position

Step 8. To resume operation follow the instructions located on the lighting instruction label or the lighting instructions located in the installation and operation manual.

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Contents Service Manual Bradford White Introduction White Rodgers/Robertshaw Gas Valve Troubleshooting Chart Honeywell Gas Control Troubleshooting Chart Honeywell Gas Control Troubleshooting Chart Defender Installation of Inner Door With Gasket Combustion chamber Closed Circuit Thermocouple Testing Robertshaw Control Closed Circuit Thermocouple Testing White Rodgers ControlThermocouple Replacement White Rodgers/Robertshaw Gas Valve Open Circuit Thermopile Testing Honeywell Gas Control PILOT/ELECTRODE Assembly Inspection Cleaning and Replacement Defender Piezo IGNITER, Electrode Testing and ReplacementLine Pressure Gas Valve Testing and Replacement White Rodgers/RobertshawMagnet Assembly Testing Robertshaw Control Thermocouple TestingMagnet Assembly Testing White Rodgers Control Combination THERMOSTAT/GAS Valve Replacement ECO Energy Cut Off TestingWrench Boss Position thermocouple, pilot tube and Piezo wire Honeywell Gas Control Testing, Disassembly, and Replacement Thermopile Testing Defender Temperature Sensor TestingSensor Resistance at Various Temperatures Determine Water Temperature Inside TankGAS Control DISASSEMBLY/REASSEMBLY Temperature sensor Wire routing clip Disconnect Use caution not to bend or damage valve body pins Pull in this direction Temperature sensor Insertion stick GAS Control Replacement Defender Combustion chamber Cast Iron Burner Adjustment Main Burner Inspection, Adjustment Cleaning and ReplacementPosition thermocouple/thermopile Pilot tube and Piezo wire Burner Cleaning Resettable Thermal Switch Continuity Testing Over Tighten Screws Resettable Thermal Switch ReplacementFeedline Nut ScreenLok Flame Arrestor CleaningDIP Tube Inspection and Replacement Anode Inspection and Replacement Generic Parts List Parts@bradfordwhite.com Techserv@bradfordwhite.com