Bradford-White Corp U4TW40T*FRN Manual Do Utilizador

 Page 40 

Step 8. 

To resume operation, follow the instructions located on the water heater 

lighting instruction label.  Or, use the lighting instructions located in the water heater 
installation and operating manual.

Step 1. 

Move the gas control power switch to the “OFF” 

position.

Step 2. 

Disconnect the flammable vapor sensor harness 

from the gas control. 

Step 3. 

Using a multi-meter set to the ohms setting, measure 

the resistance of the flammable vapor sensor and resettable ther-
mal switch.  The resistance must be between 3,000 and 48,000 
ohms.  If the resistance is out of this range, verify that the re-
settable thermal switch has not been tripped.  If it hasn’t, replace 
the thermal switch. 

Step 1. 

Verify 115VAC and proper polarity are at the wall outlet. 

Step 2. 

With the water heater plugged in and the gas control power switch in the 

“ON” position verify LED status. 

Do not use standard multi-meter probes for this testing.  Doing so will damage the connector.  Use special pin type 

electronic probes or small diameter wire pins inserted into connector. 

Gas control power 

switch 

Flammable vapor 

sensor harness 

Flammable vapor 

sensor harness 

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