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Some tankless hot water heaters feature a reset button that allows you to quickly and easily restart the unit. Press this button while holding the power button. If the power switch stays on, the element may be malfunctioning. It may also have a faulty thermostat in the upper or lower heating element. However, if you cannot quickly and accurately reset this component, you can replace the thermostat to ensure the safety of your system. There are several different reasons why a tankless hot water heater may fail to ignite. Some of these factors include low propane tank, unpaid gas bill, or malfunctioning regulator. If none of these causes your unit to operate properly, contact technical support. You should also consult a repair person if you suspect that there is an electrical issue. Besides that, there is a chance that water hardness may cause the ignition failure.