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Sensor failure. Check the wiring or replace the NTC probe.
The reveals a device that is incredibly powerful but requires respect for electricity. It is the ultimate solution for DIYers who need laboratory-grade temperature control without the laboratory price tag.
The SF-102 acts as a light switch. When the temperature gets too high, it flips the switch on Terminals 7-8 (Cooling). When it gets too low, it flips the switch on Terminals 5-6 (Heating).
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: Ensure sensor leads are kept separate from main power lines to prevent high-frequency interference.