Combination thermostat gas valve set too low for desired water temperature.
Bradford white water heater thermostat settings.
Water heaters are set from the factory to heat water to a maximum of 120 degrees fahrenheit.
Place test probes on terminals 1l and 3l see diagram of the high limit portion of the thermostat.
B set a voltmeter to the 300 volts scale.
For the a knob the temperature is 130 degrees.
Other temperature settings hot and very hot each stands for 120 degrees and 160 degrees.
Combination thermostat gas valve is out of calibration not functioning.
Incorrectly sized water heater for application.
The last c knob setting stands for 150 degrees.
Gently slide off the access panel on the side of the hot water heater to access the thermostat.
Out of spec dip tube is diluting hot water with cold water.
The limit can be reset at 120 f or below.
For the b knob the temperature which has been determined is 140 degrees.
If button snaps back out the temperature of the water is higher than the cut out setting of the limit switch.
Cold inlet water temperature is very cold.
The best way to do this is to open the circuit box for your.
Allow water temperature to drop.
Setting the water to a higher temperature increases the risk of scalding.
Turn off the power supply to your hot water heater.