Bradford-White Corp U130T*FRN Resettable Thermal Switch Continuity Testing, Probable Cause

SERVICE PROCEDURE ED-VII

Resettable Thermal Switch

Testing and Replacement

RESETTABLE THERMAL SWITCH CONTINUITY TESTING

Step 1. Remove outer jacket door.

Step 2. Disconnect white wire leads from resettable thermal switch.

Step 3. Using a multimeter capable of measuring continuity (Ohms), place one probe of meter on one of the brass connection tabs of the resettable thermal switch, and the remaining probe on the other connection tab.

Step 4. If continuity is indicated, the switch is closed, allowing millivolt current to pass.

Step 5. If continuity is not indicated, the switch is open, possibly due to an over heating condition. The switch is designed to open at predetermined temperatures. An open switch can be reset by depressing the red colored button located at the center of the switch. The overheating condition must be determined prior to putting the water heater back in service.

PROBABLE CAUSE FOR RESETTABLE THERMAL SWITCH ACTIVATION

PROBABLE CAUSE	CORRECTIVE ACTION
	1. Inspect burner per SERVICE PROCEDURE
	ED-VI
Burner Failure	2. Replace burner per SERVICE PROCEDURE
	ED-VI

Weak switch or switch out of calibration.

1. Replace resettable thermal switch

Flammable vapor incident

1. Replace water heater.

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