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Restore factory settings on T630 controller

I have a T630 controller operating in Single-loop mode. On power up it is locked in manual mode (flashing) and cannot go into auto. The controller does not have any remotely configurable modes (just i/p & o/p 4-20mA). In manual mode I can drive the o/p to limits and the i/p is correctly displaying. No obvious errors are reported in the settings or on Power up but it returns to the above configuration each time! Can I reset all settings to default/supplied settings?

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