Fourtech Temperature Controller: Manual

Dual-line LED (Upper: Process Value, Lower: Set Value).

Ensure your thermocouple (K-type is common) or RTD (Pt100) is wired with the correct positive/negative polarity to avoid "reverse" temperature readings. Warm-Up Period: Allow the unit to run for at least 30 minutes

Use the or Down Arrow buttons to change the flashing number to your desired target temperature. fourtech temperature controller manual

Hold the key for 3 to 5 seconds to open the configuration menu. Use the SET key to scroll through these critical settings: Parameter Code Parameter Name Description & Common Settings InP Input Type Selects sensor: K or J (Thermocouple), Pt (PT100 RTD). Ctrl Control Mode PID (Proportional-Integral-Derivative) or OnOF (On/Off). AH1 Alarm 1 High

This mode mimics a traditional thermostat. The output is fully ON until the PV reaches the SV, and then switches fully OFF. Dual-line LED (Upper: Process Value, Lower: Set Value)

Internal calibration data has been corrupted by electrical noise. Power down the controller for 60 seconds and restart. If the error persists, the unit requires a factory reset or hardware replacement.

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PID parameters are poorly matched, or the SSR/Relay output is stuck in the closed position.