Thermostat contacts are welded together

Thermostat does not disconnect the heater from the supply

Open in the thermostat contacts

Thermostat set too high or out of calibration

Leakage around the thermostat

Thermostat setting is too low

Leakage around heating unit flange

Grounded heating element

Thermostat contacts are in open condition

Thermostat contacts are welded together

Thermostat is set in too high range

Thermostat does not disconnect the heater from the supply

inlet valve for its full open condition

correct water level in the tank

wiring connection for open circuit and loose connections

thermostat, for its welded contacts

Leaking around the thermostat

Inlet fully open

Corroded outer cover

Excess inflow of water