Temperature sensor active redundancy method and system based on constant temperature gas water heater

The invention relates to the field of gas water heater manufacturing, in particular to a temperature sensor active redundancy method and system based on a constant temperature gas water heater. The temperature sensor active redundancy method is characterized in that whether a fault occurs to temperature sensors or not is detected by the water heater in real time, the water heater enters an active redundancy control mode if the fault occurs, whether the fault occurs to the water outlet temperature sensor or not is further judged, if the fault occurs to the water outlet temperature sensor, the detecting function of the fault water outlet temperature sensor is neglected, the water heater enters a forced discharging water heater working mode, and water is heated by adjusting and setting thermal power values. The problem that a traditional constant temperature gas water heater enters a fault protection station and cannot be used after the temperature sensors in the traditional constant temperature gas water heater