M91-t4-r6-zk1: Manual

| Error Code | Meaning | Solution from Manual | |------------|---------|----------------------| | | Thermocouple open circuit on T2 | Check wiring physically. Type K thermocouples are brittle near the junction. | | E-204 | Relay R4 coil stuck | Cycle power. If persists, replace unit (relays are not field-serviceable). | | E-307 | Zigbee module not responding | Re-seat the zk1 daughterboard (requires removing back cover – see Section 9.1). | | E-412 | Flash memory corrupt | Perform factory reset: Hold RUN button for 15 seconds during power-up. | | E-501 | Over-temperature (internal >85°C) | Check ambient cooling. Add forced air ventilation. |

Here’s a useful, structured write-up for a manual titled — assuming it refers to a piece of industrial equipment, electronic controller, or automation module (based on the alphanumeric code format). If you have a specific device in mind, you can substitute the product type accordingly. M91-t4-r6-zk1 Manual