Fourtech Temperature Controller Manual

You can use this as a and user review in one.

| Error Code | Meaning | Likely Fix | | :--- | :--- | :--- | | or - - - - | Sensor broken, shorted, or not connected | Check thermocouple wiring; replace sensor. | | HHH or LLLL | Process value above or below sensor range | Sensor type mismatch. Check input type setting (e.g., set to K type instead of Pt100). | | E.OP1 | Output 1 overload or short circuit | Inspect SSR or relay; power cycle controller. | | LOC.1 | Parameter lock is engaged | Enter the access code (often 0001 or 0100) per your manual. | | AT.ERR | Auto-tune failed | Manual tune needed; check for external disturbances (open doors, wind). | fourtech temperature controller manual

Connect to the rated voltage (e.g., 220V or 110V AC). You can use this as a and user review in one

If the controller displays a code instead of a temperature: Check input type setting (e