The indicator light of the constant temperature water blanket will not be on all the time. The indicator light of the water blanket heater is always on. It should be that the indicator light is out of order. The indicator lights are power indicator lights and heating indicator lights. After the power is turned on, the power indicator (usually a red light) will always be on. When the temperature of the electric blanket reaches the set temperature, it will be in a temperature control state, and the green heating indicator will continue to flash, which is normal.