cause
1. The heater burns out (special tips: the amount of resistance at both ends of the heating wire is called the heater burned out, but for the automatic sterilization fermenter: the temperature preservation is broken coupled with the sterilization program error, the heater is turned on during automatic sterilization---- after replacing the new heater, the heater will be broken in three forks and five places)
2. The line is connected incorrectly (generally easy to find this problem during debugging)
3. The circulation valve is not open (for novices using fermenters)
4. The solid state relay is broken
5. If the temperature insulation is adjusted too low or the temperature insulation is adjusted too high, it is generally required to adjust it between 60 and 70 degrees.
6. The check valve is stuck
7.220V heating power supply empty tripping
8. The circulating pump is broken (the current is normal when the heater is working, but the tank temperature is increased)
9. The neutral line of the 220V heating power supply is not connected properly
